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28 results on '"Muller, Alexandru"'

1. A GHz operating ScAlN based SAW resonator used for Surface Acoustic Waves/Spin Waves Coupling

Author

Zdru, Ioana, primary, Nastase, Claudia, primary, Hess, Lars, primary, Ciubotaru, Florin, primary, Nicoloiu, Alexandra, primary, Vasilache, Dan, primary, Dekkers, Matthijn, primary, Geilen, Moritz, primary, Ciornei, Cristina, primary, Dinescu, Adrian, primary, Adelmann, Christoph, primary, Weiler, Mathias, primary, Pirro, Philipp, primary, and Muller, Alexandru, primary

Published
2022
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4. Millimeter-wave identification--a new short-range radio system for low-power high data-rate applications

Author

Pursula, Pekka, Vaha-Heikkila, Tauno, Muller, Alexandru, Neculoiu, Dan, Konstantinidis, George, Oja, Aarne, and Tuovinen, Jussi

Subjects
Millimeter wave communication systems -- Design and construction, Millimeter waves -- Research, Radio frequency identification (RFID) -- Innovations, Backscattering -- Methods, Radio frequency identification, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The radio-frequency identification (RFID) concept is expanded to millimeter-wave frequencies and millimeter-wave identification (MMID) in this paper. The MMID concept and a comparison with UHF RFID are presented, showing the limitations and benefits of MMID. Three feasible applications are suggested for MMID, which are: 1) wireless mass memory; 2) an automatic identification system with pointing functionality; and 3) transponder communication with automotive radar. To demonstrate the feasibility of the MMID system, experimental results for both downlink and backscattering-based uplink are presented at 60 GHz. Index Terms--Backscattering, millimeter waves, millimeter. wave identification (MMID), RF identification (RFID).

Published
2008

7. Millimeterwave Schottky diode on grapene monolayer via asymmetric metal contacts.

Author

Dragoman, Mircea, Deligeorgis, George, Muller, Alexandru, Cismaru, Alina, Neculoiu, Dan, Konstantinidis, George, Dragoman, Daniela, Dinescu, Adrian, and Comanescu, Florin

Subjects
MILLIMETER waves, MICROWAVES, SCHOTTKY barrier diodes, SEMICONDUCTOR diodes, GRAPHENE
Abstract

The paper presents the experiments regarding a Schottky diode fabricated on a graphene monolayer using asymmetric metallic contacts. The current is in the mA range, which is with orders of magnitude higher than for reported Schottky diodes prepared on graphene bilayers or related graphene materials. Moreover, this device exhibits a DC controllable phase shift of more than 20 degrees in the range 40-65 GHz. [ABSTRACT FROM AUTHOR]

Published
2012
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18. GaAs MEMS for Millimeter Wave Communications

Author

Muller, Alexandru, Konstantinidis, George, Neculoiu, Dan, Plana, Robert, Muller, Alexandru, Konstantinidis, George, Neculoiu, Dan, and Plana, Robert

Abstract

The paper presents the authors ’ contributions towards the development of millimeter wave circuits based on GaAs micromachining.The manufacturing and characterization of different type of millimeter wave GaAs membrane supported filter structures is presented.A fully monolithically integrated millimeter wave receiver module,having the antenna as well as the detecting Schottky diode on the same GaAs membrane is also presented.

Published
2003

19. SAW Devices Manufactured on GaN/Si for Frequencies Beyond 5 GHz

Author

Muller, Alexandru, primary, Neculoiu, Dan, additional, Konstantinidis, George, additional, Deligeorgis, George, additional, Dinescu, Adrian, additional, Stavrinidis, Antonis, additional, Cismaru, Alina, additional, Dragoman, Mircea, additional, and Stefanescu, Alexandra, additional

Published
2010
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22. 38 GHz Antennas on Micromachined Silicon Substrates.

Author

Marcelli, Romolo, Dragoman, M., Neculoiu, Dan, Giacomozzi, Flavio, Muller, Alexandru, Marcelli, Romolo, Dragoman, M., Neculoiu, Dan, Giacomozzi, Flavio, and Muller, Alexandru

Abstract

A new configuration of a double folded double slot CPW feed micromachined antenna array was realized on a 1.5 µm thin three-layer dielectric membrane fabricated on a silicon substrate. The antenna was designed for an operating frequency of 38 GHz, and the double folded configuration was used for minimizing the membrane extension.

Published
2001

28. Interaction of acoustic waves with spin waves using a GHz operating GaN/Si SAW device with a Ni/NiFeSi layer between its IDTs.

Author

Zdru I, Ciubotaru F, Nastase C, Florescu A, Hamadeh AA, Geilen M, Nicoloiu A, Boldeiu G, Vasilache D, Iordanescu S, Nedelcu LM, Narducci D, Ciornei MC, Adelmann C, Dinescu A, Weiler M, Pirro P, and Muller A

Abstract

A two port surface acoustic wave (SAW) device was developed to be used for the control and excitation via spin waves (SW). The structure was manufactured using advanced nanolithography techniques, on GaN/Si, enabling fundamental Rayleigh interdigitated transducer (IDT) resonances in GHz frequency range. The ferromagnetic resonance of the magnetostrictive Ni/NiFeSi layer placed between the IDTs of the SAW device can be tuned to the SAW resonance frequency by magnetic fields. Using structures with finger and interdigit spacing of 170 nm and 100 nm, fundamental Rayleigh IDT resonance frequencies of 6.4 and 10.4 GHz have been obtained. Coupling of SAW to SW was demonstrated through transmission measurements at the fundamental Rayleigh frequencies in a magnetic field, μ0H from -280 to +280 mT, at different angles (θ) between the SAW propagation direction and the magnetic field direction. For the 6.4 GHz resonator a maximum decrease of about 1.2 dB occurred in |S21|, at μ0H = 30 mT and at θ = 45. Time-gated processing of the frequency domain raw data was used to remove the direct electromagnetic cross talk and triple transit effects. Nonreciprocity associated to the coupling was analyzed for the two SAW structures. The quantitative influence of the magnetic field strength on the phase of the transmission parameters is also presented.

Published
2024
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