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203. Complete cDNA sequences of the DRB6 gene from humans and chimpanzees: a possible model of a stop codon readingthrough mechanism in primates

Author

Moreno-Pelayo, M. A., Fernández-Soria, V. M., Paz-Artal, E., Ferre-López, Sergio, Rosal, Manuel, Morales, Pablo, and Arnaiz-Villena, A.

Abstract

Abstract:  The defective major histocompatibility complex (MHC) DRB6 gene is transcribed into mRNA in human [peripheral blood lymphocytes, transfected and Epstein-Barr virus (EBV)] and chimpanzee EBV cell lines. MHC-DRB6 presents several anomalies, which include stop codons in exon 2, lack of the usual polyadenilation signal of other MHC-DRB genes, and a promoter region and exon 1 taken from a locally inserted retrovirus. The complete cDNA sequences from human DRB6*0201 and three common chimpanzee alleles (Patr-DRB6*0108, Patr-DRB6*0109, Patr-DRB6*0111) have been obtained; two exon 1-exon 2 cDNA sequences from bonobos (Papa-DRB6*0101 and Papa-DRB6*0102) are also shown. In contrast to chimpanzee DRB6 transcripts, the human ones: (1) present an exon 1-exon 2 splicing site that includes the transcription of the first 141 nucleotides of intron 1, rendering a longer exon 1, and (2) show a duplication of exon 6, which would render a longer cytoplasmic tail in a putative DRB6 protein. These two characteristics are found in all the human sequences obtained, regardless of the cellular type tested, and they are not present in any of the chimpanzee alleles reported; consequently, they are human-specific. All the alleles reported here bear stop codons in the three possible reading frames; however, a certain level of expression of DRB6 has been observed by cytofluorometry. This could be due to the presence of a selenocysteine insertion sequence (SECIS) stem-loop structure located at the 3 untranslated region of the DRB6 mRNA, which directs selenocysteine incorporation at UGA codons. DRB6 transcription and translation would be the first gene model of a readingthrough stop codon mechanism in primate MHC. It is also feasible that the DRB6 gene might generate a population of short polypeptides, bound to plasmatic membranes, having non-antigen-presenting functions or which are presented by other MHC molecules as HLA-E presents HLA-G and -B leader sequence-derived peptides.

Published
1999
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204. Brief Communication C4d DNA sequence of complement C4B93 and recombination mechanisms for its generation.

Author

López-Goyanes, A., Moreno, M.A., Ferre, S., and Paz-Artal, E.

Subjects
DNA, CHROMOSOMES, GENES, GENETIC polymorphisms, TISSUES, ANTIGENS
Abstract

The present work reports the DNA sequence of the polymorphic region from the uncommon complement allele C4B93. It shows a new combination of Chido and Rodgers antigenicities and expresses reverse antigenicity because it carries Rodgers 1, 2, and 3. C4B93 could have arisen from an ancient, non-homologous recombination between C4A3 (or C4A6) and C4B1a or from a homologous recombination between C4B1a and C4B5. These events would be enhanced by the presence of recombination promoting Escherichia coliχ-like signals in the fragment between positions 1157 and 1186. The generation of the C4 polymorphism by recombination would explain the concerted evolution of C4 genes in primates. [ABSTRACT FROM AUTHOR]

Published
2004
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205. PLL de microondas con tiempo de adquisición reducido

Author

Berenguer Sau, Jordi, Artal, E., Corbella Sanahuja, Ignasi, Comerón Tejero, Adolfo, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció

Subjects
Oscil·ladors de microones, Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques [Àrees temàtiques de la UPC], Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica [Àrees temàtiques de la UPC], Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Microwaves, Oscillators, Microwave, Microones
Abstract

The behaviour of a PLL where the VCO is injection-locked to the reference frequency is studied. It is experimentally shown that the phase acquisition time can be reduced relative to the non-injection locked VCO situation. At the same time, the phase relationship between an injection-locked oscillator and the reference oscillator can also be fixed. These techniques can be applied to the local oscillators synthesis in a coherent receiver for the 12.5, 20 and 30 GHz beacons of the Olympus satellite.

Published
1986

206. Caracterización de transistores de Microoendas mediante la técnica de Calibrción TRL

Author

Pradell i Cara, Lluís, Sabater, C, Artal, E, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció

Subjects
education, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Transistors
Published
1989

208. Receptor para TV difundida directamente desde satélites

Author

Artal, E., Cardama Aznar, Ángel, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Elias Fusté, Antoni, Ferrando, M., Jofre Roca, Lluís, de los Reyes, Elías, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. ANTENNALAB - Grup d'Antenes i Sistemes Radio, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones

Subjects
Televisió--Receptors i recepció, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Television--Receivers and reception
Abstract

The direct broadcast satellite receiver in the 12 GHz band developed in the Electrophysics Department in cooperation with the R & D Departments of Mier Allende, S.A. and Tagra, S.A. is described. It features a low-noise amplifier with 0.3 and 0.5 mm gate width- GaAs MESFET, balanced mixer and monolithic IF amplifier along with filters, polarizer and feeder. The system has been integrated in a module installed in the focus a 0. 4 - f/D parabolic reflector. Noise figures lesser than 3 dB have been obtained leading to G/T factors greater than 24.5 db/K when using a 3 meterantenna.

Published
1984

209. PLL de microondas con tiempo de adquisición reducido

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Berenguer Sau, Jordi, Artal, E., Corbella Sanahuja, Ignasi, Comerón Tejero, Adolfo, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Berenguer Sau, Jordi, Artal, E., Corbella Sanahuja, Ignasi, and Comerón Tejero, Adolfo

Abstract

The behaviour of a PLL where the VCO is injection-locked to the reference frequency is studied. It is experimentally shown that the phase acquisition time can be reduced relative to the non-injection locked VCO situation. At the same time, the phase relationship between an injection-locked oscillator and the reference oscillator can also be fixed. These techniques can be applied to the local oscillators synthesis in a coherent receiver for the 12.5, 20 and 30 GHz beacons of the Olympus satellite., Peer Reviewed, Postprint (published version)

Published
1986

210. Amplificadores multietapa de bajo en las bandas de 20 y 30ghz

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E, Corbella Sanahuja, Ignasi, Busquets, C, Pradell i Cara, Lluís, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E, Corbella Sanahuja, Ignasi, Busquets, C, and Pradell i Cara, Lluís

Abstract

Microstrip coupled lines technology has been used to design and built low noise amplifiers in 20 and 30 GHz bands. Active devices are GaAs MESFET and HEMT in chip form. The amplifiers have input and output waveguide interfaces, probe transitions between microstrip line and rectangular waveguide are described. Two three-stage low noise amplifiers, at 20 and 30 GHz respectively, are presented., Peer Reviewed, Postprint (published version)

Published
1989

211. Radioenlace digital a 11 GHz para telemando y telecontrol

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. ANTENNALAB - Grup d'Antenes i Sistemes Radio, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E., Cardama Aznar, Ángel, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Elias Fusté, Antoni, Ferrando, Miguel, Jofre Roca, Lluís, de los Reyes, Elías, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. ANTENNALAB - Grup d'Antenes i Sistemes Radio, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E., Cardama Aznar, Ángel, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Elias Fusté, Antoni, Ferrando, Miguel, Jofre Roca, Lluís, and de los Reyes, Elías

Abstract

A digital radio-relay link in the band 10.7- 11.7 GHz developed for the remote control system of ENHER is presented. The objectives were the construction of a reliable and yet low-cost transmitter-receiver. To accomplish this, the RF unit has been constructed in microstrip on plastic substrate, and the FI from commercially available TV subsystems. The version herein presented has a 200 kbits/s capacity (susceptible of being increased) and can operate on vanes of at least 5 km., Peer Reviewed, Postprint (published version)

Published
1984

212. Caracterización de transistores de Microoendas mediante la técnica de Calibrción TRL

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Pradell i Cara, Lluís, Sabater, C, Artal, E, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Pradell i Cara, Lluís, Sabater, C, Artal, E, Comerón Tejero, Adolfo, and Corbella Sanahuja, Ignasi

Abstract

Peer Reviewed, Postprint (published version)

Published
1989

213. Multiplicadores de frecuencia para receptores coherentes de microondas

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Corbella Sanahuja, Ignasi, Berenguer Sau, Jordi, Pradell i Cara, Lluís, Comerón Tejero, Adolfo, Bará, J, Artal, E, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Corbella Sanahuja, Ignasi, Berenguer Sau, Jordi, Pradell i Cara, Lluís, Comerón Tejero, Adolfo, Bará, J, and Artal, E

Abstract

The design of frequency multipliers using PLL techniques is presented in this article. The theory is dicussed and also experimental results of a x43 frequency multiplier with an output frequency of 11.4 GHz in wich excellent performance has been achieved., Peer Reviewed, Postprint (published version)

Published
1986

214. Receptor para TV difundida directamente desde satélites

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. ANTENNALAB - Grup d'Antenes i Sistemes Radio, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E., Cardama Aznar, Ángel, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Elias Fusté, Antoni, Ferrando, M., Jofre Roca, Lluís, de los Reyes, Elías, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. ANTENNALAB - Grup d'Antenes i Sistemes Radio, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E., Cardama Aznar, Ángel, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Elias Fusté, Antoni, Ferrando, M., Jofre Roca, Lluís, and de los Reyes, Elías

Abstract

The direct broadcast satellite receiver in the 12 GHz band developed in the Electrophysics Department in cooperation with the R & D Departments of Mier Allende, S.A. and Tagra, S.A. is described. It features a low-noise amplifier with 0.3 and 0.5 mm gate width- GaAs MESFET, balanced mixer and monolithic IF amplifier along with filters, polarizer and feeder. The system has been integrated in a module installed in the focus a 0. 4 - f/D parabolic reflector. Noise figures lesser than 3 dB have been obtained leading to G/T factors greater than 24.5 db/K when using a 3 meterantenna., Peer Reviewed, Postprint (published version)

Published
1984

215. S-parameter measurement of chip Ga As FETs up to 22 GHz using the TRL calibration technique

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Pradell i Cara, Lluís, Artal, E, Sabater, C, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Pradell i Cara, Lluís, Artal, E, and Sabater, C

Abstract

In this paper, the design of a Microstrip Test Fixture for TRL calibration is described. Experimental results for S-parameters measurement of a GaAs FET chip in the 3-22 GHz frequency range are presented. Repeatability of connections and measurements is discussed and experimental results are also presented., Peer Reviewed, Postprint (published version)

Published
1989

216. 20/30 GHz front-end for the TMS-7 receiving station of the OLYMPUS satellite

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E, Bará, J, Berenguer Sau, Jordi, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, Pradell i Cara, Lluís, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Artal, E, Bará, J, Berenguer Sau, Jordi, Comerón Tejero, Adolfo, Corbella Sanahuja, Ignasi, and Pradell i Cara, Lluís

Abstract

The authors present the 20/30-GHz front-end of the TMS-7 station for performing the measurement of the flux density of one or more signal carriers received from the OLYMPUS satellite. The front-end is composed of two receiving channels and a pilot generator. Local oscillators follow the frequency drifts of the satellite signals using a complex phase-locking system., Peer Reviewed, Postprint (published version)

Published
1989

218. The Ka-band receiver for the QUIJOTE experiment

Author

Cano, J. L., Enrique Villa, Aja, B., La Fuente, L., Artal, E., Watson, R., Blackhurst, E., Edgley, J., Baines, C., and Universidad de Cantabria

Subjects
InP, Radiometer, Radio astronomy, Very low noise receivers, Cryogenic amplifiers, Radiometry, HEMT
Abstract

The 26-36 GHz receiver for a radio astronomy radiometer, to characterize the polarization of the Cosmic Microwave Background, is presented. This receiver is based on very low noise cryogenically cooled amplifiers in the front-end module, while in the back-end module a broadband amplification and direct detection chain is operated at room temperature. Noise temperature of the low-noise amplifier (LNA) is 19 K when cooled at 18 K. Experimental results show a good sensitivity of the complete receiver with an effective bandwidth around 8 GHz. Moreover, output detected voltages agree with estimated values. This work has been funded by the Ministerio de Ciencia e Innovación (Spain) under Astronomy and Astrophysics research programme, reference AYA2007-68058-C03.

219. Radioenlace digital a 11 GHz para telemando y telecontrol

Author

Artal, E., Cardama Aznar, Ángel, Comerón Tejero, Adolfo|||0000-0001-6886-3679, Corbella Sanahuja, Ignasi|||0000-0001-5598-7955, Elias Fusté, Antoni|||0000-0001-6449-4458, Ferrando, Miguel, Jofre Roca, Lluís|||0000-0002-0547-901X, de los Reyes, Elías, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. ANTENNALAB - Grup d'Antenes i Sistemes Radio, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones

Subjects
Radio relay systems, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica [Àrees temàtiques de la UPC], Radioenllaços
Abstract

A digital radio-relay link in the band 10.7- 11.7 GHz developed for the remote control system of ENHER is presented. The objectives were the construction of a reliable and yet low-cost transmitter-receiver. To accomplish this, the RF unit has been constructed in microstrip on plastic substrate, and the FI from commercially available TV subsystems. The version herein presented has a 200 kbits/s capacity (susceptible of being increased) and can operate on vanes of at least 5 km.

221. Planck-LFI: Instrument Design and Ground Calibration Strategy

Author

Bersanelli, M., Aja, B., Artal, E., Balasini, M., Baldan, G., Battaglia, P., Bernardino, T., Bhandari, P., Blackhurst, E., Boschini, L., Bowman, R., Burigana, C., Butler, R. C., Cappellini, B., Cavaliere, F., Colombo, F., Cuttaia, F., Davis, R., Dupac, X., Edgeley, J., D Arcangelo, O., La Fuente, L., Rosa, A., Ferrari, F., Figini, L., Fogliani, S., Franceschet, C., Franceschi, E., Jukkala, P., Gaier, T., Galtress, A., Garavaglia, S., Gomez-Renasco, F., Guzzi, P., Herreros, J. M., Hoyland, R., Huges, N., Kettle, D., Kilpel, V. H., Laaninen, M., Lapolla, M., Lawrence, C. R., Lawson, D., Leonardi, R., Leutenegger, P., Levin, S., Lilje, P. B., Lubin, P. M., Maino, D., Malaspina, M., Mandolesi, N., Mari, G., Maris, M., Martinez-Gonzalez, E., Mediavilla, A., Meinhold, P., Mennella, A., Miccolis, M., Morgante, G., Nash, A., Nesti, R., Pagan, L., Paine, C., Pascual, J. P., Pasian, F., Pecora, M., Pezzati, S., Pospieszalski, M., Platania, P., Prina, M., Rebolo, R., Roddis, N., Sabatini, N., Sandri, M., Salmon, M. J., Seiffert, M., Silvestri, R., Simonetto, A., Smoot, G. F., Sozzi, C., Stringhetti, L., Terenzi, L., Tomasi, M., Tuovinen, J., Luca Valenziano, Varis, J., Villa, F., Wade, L., Wilkinson, A., Winder, F., and Zacchei, A.

Subjects
___, Astrophysics::Instrumentation and Methods for Astrophysics
Abstract

The ESA Planck satellite is designed to achieve precision imaging of the Cosmic Microwave Background with an unprecedented combination of angular resolution, sensitivity, spectral range and sky coverage. The Low Frequency Instrument is one of two complementary instruments, and covers 30, 44, and 70 GHz with an array of wideband pseudo-correlation, cryogenic radiometers. Advanced qualification models of the radiometer chains and of the instrument electronics have been manufactured, tested and integrated into the LFI Qualification Model. The main radiometer calibration, RF tuning and performance characterization is carried out at a single radiometer chain level, and then verified at instrument integrated level in dedicated cryofacilities. Here we describe the main requirements and instrument design, and we summarize the radiometer calibration strategy optimised during the qualification activity in view of the LFI Flight Model campaign.

223. Multiplicadores de frecuencia para receptores coherentes de microondas

Author

Corbella Sanahuja, Ignasi, Berenguer Sau, Jordi, Pradell i Cara, Lluís, Comerón Tejero, Adolfo, Bará, J, Artal, E, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció

Subjects
Microwave receivers, Receptors de microones, Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques [Àrees temàtiques de la UPC], Hardware_ARITHMETICANDLOGICSTRUCTURES, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC]
Abstract

The design of frequency multipliers using PLL techniques is presented in this article. The theory is dicussed and also experimental results of a x43 frequency multiplier with an output frequency of 11.4 GHz in wich excellent performance has been achieved.

225. The QUIJOTE experiment

Author

Rubiño-Martín, J. A., Génova-Santos, R., Rebolo, R., Aguiar, M., Cózar-Castellano, J., Gómez-Reñasco, F., Gutiérrez, C., Hoyland, R. J., López-Caraballo, C., Peláez-Santos, A. E., Pérez-De-Taoro, M. R., Poidevin, F., Ruiz-Granados, B., Sánchez La Rosa, V., Tramonte, D., Vega-Moreno, A., Viera-Curbelo, T., Vignaga, R., Martínez-González, E., Barreiro, R. B., Casaponsa, B., Casas, F. J., Diego, J. M., Fernández-Cobos, R., Herranz, D., López-Caniego, M., Ortiz, D., Vielva, P., Artal, E., Aja, B., Cagigas, J., Cano, J. L., La Fuente, L., Mediavilla, A., Terán, J. V., Villa, E., Lucio Piccirillo, Clive Dickinson, Keith Grainge, Simon Harper, Maffei, B., Mcculloch, M., Melhuish, S., Pisano, G., Robert Watson, Lasenby, A., Ashdown, M., Perrott, Y., Razavi-Ghods, N., and Scott, P.

227. Método para la determinación de los parámetros de ruido a partir de medidas precisas de factor de ruido y parámetros S

Author

Borràs, S., Pradell i Cara, Lluís, Comerón Tejero, Adolfo, Artal, E., Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones, and Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció

Subjects
Soroll radioelèctric, education, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica [Àrees temàtiques de la UPC], Transistors, Radio noise

229. Amplificadores multietapa de bajo en las bandas de 20 y 30ghz

Author

Artal, E, Corbella Sanahuja, Ignasi|||0000-0001-5598-7955, Busquets, C, Pradell i Cara, Lluís|||0000-0003-4026-226X, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones

Subjects
Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica [Àrees temàtiques de la UPC], Transistors
Abstract

Microstrip coupled lines technology has been used to design and built low noise amplifiers in 20 and 30 GHz bands. Active devices are GaAs MESFET and HEMT in chip form. The amplifiers have input and output waveguide interfaces, probe transitions between microstrip line and rectangular waveguide are described. Two three-stage low noise amplifiers, at 20 and 30 GHz respectively, are presented.

231. The QUIJOTE CMB Experiment: status and first results with the multi-frequency instrument

Author

López-Caniego, M., Rebolo, R., Aguiar, M., Génova-Santos, R., Gómez-Reñasco, F., Gutierrez, C., Herreros, J. M., Hoyland, R. J., López-Caraballo, C., Pelaez Santos, A. E., Poidevin, F., Rubiño-Martín, J. A., Sanchez La Rosa, V., Tramonte, D., Vega-Moreno, A., Viera-Curbelo, T., Vignaga, R., Martínez-González, E., Barreiro, R. B., Casaponsa, B., Casas, F. J., Diego, J. M., Fernández-Cobos, R., Herranz, D., Ortiz, D., Vielva, P., Artal, E., Aja, B., Cagigas, J., Cano, J. L., La Fuente, L., Mediavilla, A., Terán, J. V., Villa, E., Lucio Piccirillo, Richard Battye, Blackhurst, E., Michael Brown, Davies, R. D., Davis, R. J., Clive Dickinson, Keith Grainge, Harper, S., Bruno Maffei, Mcculloch, M., Melhuish, S., Pisano, G., Robert Watson, Hobson, M., Lasenby, A., Saunders, R., and Scott, P.

Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The QUIJOTE (Q-U-I JOint Tenerife) CMB Experiment is designed to observe the polarization of the Cosmic Microwave Background and other Galactic and extragalactic signals at medium and large angular scales in the frequency range of 10-40 GHz. The first of the two QUIJOTE telescopes and the multi-frequency (10-20 GHz) instrument have been in operation since November 2012. In 2014 a second telescope and a new instrument at 30GHz will be ready for commissioning, and an additional instrument at 40 GHz is in its final design stages. After three years of effective observations, the data obtained by these telescopes and instruments will have the required sensitivity to detect a primordial gravitational-wave component if the tensor-to-scalar ratio is larger than r = 0.05. At the moment, we have completed half of the wide Galactic survey with the multi-frequency instrument covering 18 000 square degrees of the Northern hemisphere. When we finish this survey in early 2014, we shall have reached approximately 14{\mu}K per one degree beam at 11, 13, 17 and 19 GHz, in both Q and U., Comment: Rencontres du Vietnam 2013: Cosmology in the Planck Era. Conference Proceedings. Typos added

232. The QUIJOTE experiment: project status and first scientific results

Author

Arribas, S, Alonso-Herrero, A, Figueras, F, Hernández-Monteagudo, C., Sánchez-Lavega, A, Pérez-Hoyos, S, Rubino-Martın, J.A., Genova-Santos, R., Rebolo, R., Aguiar, M., Cozar-Castellano, J., Gomez-Renasco, F., Gutierrez, C., Hoyland, R. J., Lopez-Caraballo, C., Pelaez-Santos, A. E., Perez-de-Taoro, M. R., Poidevin, F., Ruiz-Granados, B., Sanchez de la Rosa, V., Tramonte, D., Vega-Moreno, A., Viera-Curbelo, T., Vignaga, R., Martınez-Gonzalez, E., Barreiro, R. B., Casaponsa, B., Casas, F. J., Diego, J. M., Fernandez-Cobos, R, Herranz, D., Lopez-Caniego, M., Ortiz, D., Vielva, P., Artal, E., Aja, B., Cagigas, J., Cano, J. L., de la Fuente, L., Mediavilla, A., Teran, J. V., Villa, E., Piccirillo, L., Dickinson, C., Grainge, K., Harper, S., Maffei, B., McCulloch, M., Melhuish, S., Pisano, Giampaolo, Watson, R. A., Lasenby, A., Ashdown, M., Perrott, Y., Razavi-Ghods, N., Titterington, D., Scott, P., Arribas, S, Alonso-Herrero, A, Figueras, F, Hernández-Monteagudo, C., Sánchez-Lavega, A, Pérez-Hoyos, S, Rubino-Martın, J.A., Genova-Santos, R., Rebolo, R., Aguiar, M., Cozar-Castellano, J., Gomez-Renasco, F., Gutierrez, C., Hoyland, R. J., Lopez-Caraballo, C., Pelaez-Santos, A. E., Perez-de-Taoro, M. R., Poidevin, F., Ruiz-Granados, B., Sanchez de la Rosa, V., Tramonte, D., Vega-Moreno, A., Viera-Curbelo, T., Vignaga, R., Martınez-Gonzalez, E., Barreiro, R. B., Casaponsa, B., Casas, F. J., Diego, J. M., Fernandez-Cobos, R, Herranz, D., Lopez-Caniego, M., Ortiz, D., Vielva, P., Artal, E., Aja, B., Cagigas, J., Cano, J. L., de la Fuente, L., Mediavilla, A., Teran, J. V., Villa, E., Piccirillo, L., Dickinson, C., Grainge, K., Harper, S., Maffei, B., McCulloch, M., Melhuish, S., Pisano, Giampaolo, Watson, R. A., Lasenby, A., Ashdown, M., Perrott, Y., Razavi-Ghods, N., Titterington, D., and Scott, P.

Abstract

We present the current status of the QUIJOTE (Q-U-I JOint TEnerife) experiment, a new polarimeter with the aim of characterizing the polarization of the Cosmic Microwave Background, and other galactic or extra-galactic physical processes that emit in microwaves in the frequency range 10–42 GHz, and at large angular scales (around 1 degree resolution). The experiment has been designed to reach the required sensitivity to detect a primordial gravitational wave component in the CMB, provided its tensor-to-scalar ratio is larger than r ∼ 0.05. The project consists of two telescopes and three instruments which will survey a large sky area from the Teide Observatory to provide I, Q and U maps of high sensitivity. The first QUIJOTE instrument, known as Multi-Frequency Instrument (MFI), has been surveying the northern sky in four individual frequencies between 10 and 20 GHz since November 2012, providing data with an average sensitivity of 80 µK beam−1 in Q and U in a region of 20, 000 square-degrees. The second instrument, or Thirty-GHz Instrument (TGI), is currently undergoing the commissioning phase, and the third instrument, or Forty-GHz Instrument (FGI), is in the final fabrication phase. Finally, we describe the first scientific results obtained with the MFI. Some specific regions, mainly along the Galactic plane, have been surveyed to a deeper depth, reaching sensitivities of around 40 µK beam−1. We present new upper limits on the polarization of the anomalous dust emission, resulting from these data, in the Perseus molecular complex and in the W43 molecular complex.

233. The QUIJOTE-CMB experiment: studying the polarisation of the galactic and cosmological microwave emissions

Author

Stepp, Larry M., Gilmozzi, Roberto, Hall, Helen J., Rubiño-Martín, J. A., Rebolo, R., Aguiar, M., Génova-Santos, R., Gómez-Reñasco, F., Herreros, J. M., Hoyland, R. J., López-Caraballo, C., Pelaez Santos, A. E., Sanchez de la Rosa, V., Vega-Moreno, A., Viera-Curbelo, T., Martínez-Gonzalez, E., Barreiro, R. B., Casas, F. J., Diego, J. M., Fernández-Cobos, R., Herranz, D., López-Caniego, M., Ortiz, D., Vielva, P., Artal, E., Aja, B., Cagigas, J., Cano, J. L., de la Fuente, L., Mediavilla, A., Terán, J. V., Villa, E., Piccirillo, L., Battye, R., Blackhurst, E., Brown, M., Davies, R. D., Davis, R. J., Dickinson, C., Harper, S., Maffei, B., McCulloch, M., Melhuish, S., Pisano, Giampaolo, Watson, R. A., Hobson, M., Grainge, K., Lasenby, A., Saunders, R., Scott, P., Stepp, Larry M., Gilmozzi, Roberto, Hall, Helen J., Rubiño-Martín, J. A., Rebolo, R., Aguiar, M., Génova-Santos, R., Gómez-Reñasco, F., Herreros, J. M., Hoyland, R. J., López-Caraballo, C., Pelaez Santos, A. E., Sanchez de la Rosa, V., Vega-Moreno, A., Viera-Curbelo, T., Martínez-Gonzalez, E., Barreiro, R. B., Casas, F. J., Diego, J. M., Fernández-Cobos, R., Herranz, D., López-Caniego, M., Ortiz, D., Vielva, P., Artal, E., Aja, B., Cagigas, J., Cano, J. L., de la Fuente, L., Mediavilla, A., Terán, J. V., Villa, E., Piccirillo, L., Battye, R., Blackhurst, E., Brown, M., Davies, R. D., Davis, R. J., Dickinson, C., Harper, S., Maffei, B., McCulloch, M., Melhuish, S., Pisano, Giampaolo, Watson, R. A., Hobson, M., Grainge, K., Lasenby, A., Saunders, R., and Scott, P.

Abstract

The QUIJOTE (Q-U-I JOint Tenerife) CMB Experiment will operate at the Teide Observatory with the aim of characterizing the polarisation of the CMB and other processes of Galactic and extragalactic emission in the frequency range of 10-40GHz and at large and medium angular scales. The first of the two QUIJOTE telescopes and the first multi-frequency (10-30GHz) instrument are already built and have been tested in the laboratory. QUIJOTE-CMB will be a valuable complement at low frequencies for the Planck mission, and will have the required sensitivity to detect a primordial gravitational-wave component if the tensor-to-scalar ratio is larger than r = 0.05. © (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

234. The status of the QUIJOTE multi-frequency instrument

Author

Holland, Wayne S., Zmuidzinas, Jonas, Hoyland, R. J., Aguiar-González, M., Aja, B., Ariño, J., Artal, E., Barreiro, R. B., Blackhurst, E. J., Cagigas, J., Cano de Diego, J. L., Casas, F. J., Davis, R. J., Dickinson, C., Arriaga, B. E., Fernandez-Cobos, R., de la Fuente, L., Génova-Santos, R., Gómez, A., Gomez, C., Gómez-Reñasco, F., Grainge, K., Harper, S., Herran, D., Herreros, J. M., Herrera, G. A., Hobson, M. P., Lasenby, A. N., Lopez-Caniego, M., López-Caraballo, C., Maffei, Bruno, Martinez-Gonzalez, E., McCulloch, M., Melhuish, SImon John, Mediavilla, A., Murga, G., Ortiz, D., Piccirillo, Lucio, Pisano, Giampaolo, Rebolo-López, R., Rubiño-Martin, J. A., Ruiz, J. Luis, Sanchez de la Rosa, V., Sanquirce, R., Vega-Moreno, A., Vielva, P., Viera-Curbelo, T., Villa, E., Vizcargüenaga, A., Watson, R. A., Holland, Wayne S., Zmuidzinas, Jonas, Hoyland, R. J., Aguiar-González, M., Aja, B., Ariño, J., Artal, E., Barreiro, R. B., Blackhurst, E. J., Cagigas, J., Cano de Diego, J. L., Casas, F. J., Davis, R. J., Dickinson, C., Arriaga, B. E., Fernandez-Cobos, R., de la Fuente, L., Génova-Santos, R., Gómez, A., Gomez, C., Gómez-Reñasco, F., Grainge, K., Harper, S., Herran, D., Herreros, J. M., Herrera, G. A., Hobson, M. P., Lasenby, A. N., Lopez-Caniego, M., López-Caraballo, C., Maffei, Bruno, Martinez-Gonzalez, E., McCulloch, M., Melhuish, SImon John, Mediavilla, A., Murga, G., Ortiz, D., Piccirillo, Lucio, Pisano, Giampaolo, Rebolo-López, R., Rubiño-Martin, J. A., Ruiz, J. Luis, Sanchez de la Rosa, V., Sanquirce, R., Vega-Moreno, A., Vielva, P., Viera-Curbelo, T., Villa, E., Vizcargüenaga, A., and Watson, R. A.

Abstract

The QUIJOTE-CMB project has been described in previous publications. Here we present the current status of the QUIJOTE multi-frequency instrument (MFI) with five separate polarimeters (providing 5 independent sky pixels): two which operate at 10-14 GHz, two which operate at 16-20 GHz, and a central polarimeter at 30 GHz. The optical arrangement includes 5 conical corrugated feedhorns staring into a dual reflector crossed-draconian system, which provides optimal cross-polarization properties (designed to be < −35 dB) and symmetric beams. Each horn feeds a novel cryogenic on-axis rotating polar modulator which can rotate at a speed of up to 1 Hz. The science driver for this first instrument is the characterization of the galactic emission. The polarimeters use the polar modulator to derive linear polar parameters Q, U and I and switch out various systematics. The detection system provides optimum sensitivity through 2 correlated and 2 total power channels. The system is calibrated using bright polarized celestial sources and through a secondary calibration source and antenna. The acquisition system, telescope control and housekeeping are all linked through a real-time gigabit Ethernet network. All communication, power and helium gas are passed through a central rotary joint. The time stamp is synchronized to a GPS time signal. The acquisition software is based on PLCs written in Beckhoffs TwinCat and ethercat. The user interface is written in LABVIEW. The status of the QUIJOTE MFI will be presented including pre-commissioning results and laboratory testing.

243. Equalize Gain In Millimeter-Wave Amplifiers.

Author

Pascual, J. P., Aja, B., De La Fuente, Ma. L., Detratti, M., and Artal, E.

Subjects
MILLIMETER wave devices, ELECTRONIC equipment, MICROWAVE integrated circuits, MICROWAVE circuits, WAVEGUIDES, STRIP transmission lines, EQUALIZERS (Electronics)
Abstract

Deals with the development of millimeter-wave monolithic-microwave integrated circuits for a wide range of applications. Reason for the need of simulation tools to model the waveguide-to-microstrip transitions required at millimeter-wave frequencies; Important factor for minimizing loss with associated components and structures; Restrictions to implement equalizers at millimeter-wave frequencies.

Published
2005

244. QUIJOTE Scientific Results – XVII. Studying the anomalous microwave emission in the Andromeda Galaxy with QUIJOTE-MFI.

Author

Fernández-Torreiro, M, Génova-Santos, R T, Rubiño-Martín, J A, López-Caraballo, C H, Peel, M W, Arce-Tord, C, Rebolo, R, Artal, E, Ashdown, M, Barreiro, R B, Casas, F J, de la Hoz, E, Guidi, F, Herranz, D, Hoyland, R, Lasenby, A, Martínez-Gonzalez, E, Piccirillo, L, Poidevin, F, and Ruiz-Granados, B

Subjects
*ANDROMEDA Galaxy, *SPECTRAL energy distribution, *MILKY Way, *GALAXY clusters, *LOGNORMAL distribution
Abstract

The Andromeda Galaxy (M31) is the Local Group galaxy that is most similar to the Milky Way (MW). The similarities between the two galaxies make M31 useful for studying integrated properties common to spiral galaxies. We use the data from the recent QUIJOTE-MFI Wide Survey, together with new raster observations focused on M31, to study its integrated emission. The addition of raster data improves the sensitivity of QUIJOTE-MFI maps by almost a factor 3. Our main interest is to confirm if anomalous microwave emission (AME) is present in M31, as previous studies have suggested. To do so, we built the integrated spectral energy distribution of M31 between 0.408 and 3000 GHz. We then performed a component separation analysis taking into account synchrotron, free–free, AME, and thermal dust components. AME in M31 is modelled as a log-normal distribution with maximum amplitude, A AME, equal to 1.03 ± 0.32 Jy. It peaks at |${\nu _{\rm AME}}=17.2\pm 3.2{\rm \, GHz}{}$| with a width of W AME = 0.58 ± 0.16. Both the Akaike and Bayesian information criteria find the model without AME to be less than 1 per cent as probable as the one taking AME into consideration. We find that the AME emissivity per 100  |$\mu$| m intensity in M31 is |${\epsilon _{\rm AME}^{\rm 28.4\, GHz}}=9.6\pm 3.1\,\mu$| K MJy−1 sr, similar to that of the MW. We also provide the first upper limits for the AME polarization fraction in an extragalactic object. M31 remains the only galaxy where an AME measurement has been made of its integrated spectrum. [ABSTRACT FROM AUTHOR]

Published
2024
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245. QUIJOTE scientific results – XIII. Intensity and polarization study of the microwave spectra of supernova remnants in the QUIJOTE-MFI wide survey: CTB 80, Cygnus Loop, HB 21, CTA 1, Tycho, and HB 9.

Author

López-Caraballo, C H, Ruiz-Granados, B, Génova-Santos, R T, Fernández-Torreiro, M, Rubiño-Martín, J A, Peel, M W, Poidevin, F, Artal, E, Ashdown, M, Barreiro, R B, Casas, F J, de la Hoz, E, González-González, R, Guidi, F, Herranz, D, Hoyland, R, Lasenby, A, Martínez-González, E, Piccirillo, L, and Rebolo, R

Subjects
*SUPERNOVA remnants, *SUPERNOVAE spectra, *LARGE magellanic cloud, *SPECTRAL energy distribution, *MICROWAVES, *COSMIC background radiation, *SYNCHROTRON radiation
Abstract

We use the new QUIJOTE-MFI wide survey (11, 13, 17, and 19 GHz) to produce spectral energy distributions (SEDs), on an angular scale of 1°, of the supernova remnants (SNRs) CTB 80, Cygnus Loop, HB 21, CTA 1, Tycho, and HB 9. We provide new measurements of the polarized synchrotron radiation in the microwave range. The intensity and polarization SEDs are obtained and modelled by combining QUIJOTE-MFI maps with ancillary data. In intensity, we confirm the curved spectra of CTB 80 and HB 21 with a break frequency νb at 2.0 |$^{+1.2}_{-0.5}$| and 5.0 |$^{+1.2}_{-1.0}$|  GHz, respectively; and spectral indices above the break of |$-0.6^{+0.04}_{-0.05}$| and |$-0.86^{+0.04}_{-0.05}$|⁠. We provide constraints on the Anomalous Microwave Emission, suggesting that it is negligible towards these SNRs. From a simultaneous intensity and polarization fit, we recover synchrotron spectral indices as flat as −0.24, and the whole sample has a mean and scatter of −0.44 ± 0.12. The polarization fractions have a mean and scatter of 6.1 ± 1.9 per cent. When combining our results with the measurements from other QUIJOTE (Q-U-I JOint TEnerife CMB experiment) studies of SNRs, we find that radio spectral indices are flatter for mature SNRs, and particularly flatter for CTB 80 (⁠|$-0.24^{+0.07}_{-0.06}$|⁠) and HB 21 (⁠|$-0.34^{+0.04}_{-0.03}$|⁠). In addition, the evolution of the spectral indices against the SNRs age is modelled with a power-law function, providing an exponent −0.07 ± 0.03 and amplitude −0.49 ± 0.02 (at 10 kyr), which are conservative with respect to previous studies of our Galaxy and the Large Magellanic Cloud. [ABSTRACT FROM AUTHOR]

Published
2024
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247. Partial immune reconstitution after bone marrow transplantation in a boy with recombination activating gene 1 defect.

Author

Muñoz-Robles, J., Del Rey, M. J., Ruiz-Contreras, J., Clemente, J., Ramos, J. T., Paz-Artal, E., and Allende, L. M.

Subjects
BONE marrow transplantation, GENETIC recombination, IMMUNODEFICIENCY, IMMUNITY, CELLULAR immunity, GRAFT versus host disease
Abstract

Reports on a partial immune reconstruction after bone marrow transplantation (BMT) in a boy with recombination activating gene 1 defect. Symptoms of severe combined immunodeficiencies (SCID) like impairment of both humoral and cell-mediated immunity; Need for consideration of BMT soon after diagnosis; Details of the BMT on a patient with SCID and suspected recombination deficiency of genes (RAG); Resultant immunological reconstitution with no acute or chronic graft-versus-host disease (GVHD).

Published
2004
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248. QUIJOTE scientific results – X. Spatial variations of Anomalous Microwave Emission along the Galactic plane.

Author

Fernández-Torreiro, M, Rubiño-Martín, J A, López-Caraballo, C H, Génova-Santos, R T, Peel, M W, Guidi, F, Harper, S E, Artal, E, Ashdown, M, Barreiro, R B, Casas, F J, de la Hoz, E, Herranz, D, Hoyland, R, Lasenby, A, Martínez-Gonzalez, E, Piccirillo, L, Poidevin, F, Rebolo, R, and Ruiz-Granados, B

Subjects
*SPATIAL variation, *MODEL airplanes, *SPECTRAL energy distribution, *MEDIAN (Mathematics), *SYNCHROTRON radiation, *COSMIC background radiation, *DUST explosions
Abstract

Anomalous microwave emission (AME) is an important emission component between 10 and 60 GHz that is not yet fully understood. It seems to be ubiquitous in our Galaxy and is observed at a broad range of angular scales. Here we use the new QUIJOTE-MFI wide survey data at 11, 13, 17, and 19 GHz to constrain the AME in the Galactic plane (| b | < 10°) on degree scales. We built the spectral energy distribution between 0.408 and 3000 GHz for each of the 5309 0.9° pixels in the Galactic plane, and fitted a parametric model by considering five emission components: synchrotron, free–free, AME, thermal dust and CMB anisotropies. We show that not including QUIJOTE-MFI data points leads to the underestimation (up to 50 per cent) of the AME signal in favour of free–free emission. The parameters describing these components are then intercompared, looking for relations that help to understand AME physical processes. We find median values for the AME width, W AME, and for its peak frequency, νAME, respectively of |$0.560^{+0.059}_{-0.050}$| and |$20.7^{+2.0}_{-1.9}$|  GHz, slightly in tension with current theoretical models. We find spatial variations throughout the Galactic plane for νAME, but only with reduced statistical significance. We report correlations of AME parameters with certain ISM properties, such as that between the AME emissivity (which shows variations with the Galactic longitude) and the interstellar radiation field, and that between the AME peak frequency and dust temperature. Finally, we discuss the implications of our results on the possible molecules responsible for AME. [ABSTRACT FROM AUTHOR]

Published
2023
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249. Octave bandwidth hybrid-coupled microstrip diplexer for a broadband radio astronomy receiver.

Author

Villa, E., Aja, B., Artal, E., and de la Fuente, L.

Subjects
*MICROSTRIP transitions, *RADIO astronomy, *ELECTROOPTICAL devices, *OPTICAL interferometers, *INSERTION loss measurement
Abstract

A new octave bandwidth high selectivity compact microstrip diplexer working in the band from 10 to 20 GHz is presented, intended to be a part of an electro-optical interferometer covering the whole frequency band. The circuit is based on the combination of hybrid couplers and bandpass filters both on the microstrip technology. The diplexer provides two output frequency bands which cover the 10–14 GHz (relative bandwidth of 33%) and the 16–20 GHz (relative bandwidth of 22%) ranges, respectively, with a stop band in between from 14 to 16 GHz. Measured results show a insertion loss level of 3.3 dB for both output bands and high selectivity performance, exhibiting a rejection level between output bands higher than 20 dB and return loss better than 10 dB in all ports. [ABSTRACT FROM AUTHOR]

Published
2018
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