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Your search keyword '"Kuo, Yue-Fang"' showing total 34 results
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34 results on '"Kuo, Yue-Fang"'

1. ALMA2030 Band-4+5 receiver front-end wideband sensitivity upgrade: first year initial development and future plan

Author

Zmuidzinas, Jonas, Gao, Jian-Rong, Hwang, Yuh-Jing, Lee, Bangwon, Wang, MingJye, Huang, Yu Chieh, Chiong, Chau-Ching, Kuo, Yue-Fang, Chien, Chen, Ho, Chin-Ting, Chen, Tse-Jun, Lu, Wei-Chun, Chang, Yen-Pin, Chang, Hsiao-Wen, Chiu, Chuang-Ping, Nian, Jia-Ruei, Wang, Chao-Ching, Hsu, Fang-Yu, Chen, Pai-An, Lu, Lou-Chien, Koch, Patrick, Kojima, Takafumi, and Gonzalez, Alvaro

Published
2024
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16. Band-1 receiver front-end cartridges for Atacama Large Millimeter/submillimeter Array (ALMA): design and development toward production

Author

Hwang, Yuh Jing, Chiong, Chau Ching, Huang, Yau De, Huang, Chi Den, Liu, Ching Tang, Kuo, Yue Fang, Weng, Shou Hsien, Ho, Chin Ting, Chiang, Po Han, Wu, Hsiao Ling, Chang, Chih Cheng, Jian, Shou Ting, Lee, Chien Feng, Lee, Yi Wei, Pospieszalski, Marian, Henke, Doug, Finger, Ricardo, Tapia, Valeria, Gonzalez, Alvaro, Zmuidzinas, Jonas, Holland, Wayne S., and Electromagnetics

Subjects
Physics, Noise temperature, business.industry, Aperture, Amplifier, Superheterodyne receiver, 020206 networking & telecommunications, Gain compression, Resistive transistor mixer, 02 engineering and technology, Atacama Large Millimeter Array, 01 natural sciences, law.invention, 010309 optics, Optics, Heterodyne receiver, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Cryogenically cooled low-noise amplifier, Millimeter, Radio frequency, Local oscillators, business
Abstract

The ALMA Band-1 receiver front-end prototype cold and warm cartridge assemblies, including the system and key components for ALMA Band-1 receivers have been developed and two sets of prototype cartridge were fully tested. The measured aperture efficiency for the cold receiver is above the 80% specification except for a few frequency points. Based on the cryogenically cooled broadband low-noise amplifiers provided by NRAO, the receiver noise temperature can be as low as 15 - 32K for pol-0 and 17 - 30K for pol-1. Other key testing items are also measured. The receiver beam pattern is measured, the results is well fit to the simulation and design. The pointing error extracted from the measured beam pattern indicates the error is 0.1 degree along azimuth and 0.15 degree along elevation, which is well fit to the specification (smaller than 0.4 degree). The equivalent hot load temperature for 5% gain compression is 492 - 4583K, which well fit to the specification of 5% with 373K input thermal load. The image band suppression is higher than 30 dB typically and the worst case is higher than 20 dB for 34GHz RF signal and 38GHz LO signal, which is all higher than 7 dB required specification. The cross talk between orthogonal polarization is smaller than -85 dB based on present prototype LO. The amplitude stability is below 2.0 x 10-7, which is fit to the specification of 4.0 x 10-7 for timescales in the range of 0.05 s ≤ T ≤ 100 s. The signal path phase stability measured is smaller than 5 fs, which is smaller than 22 fs for Long term (delay drift) 20 s ≤ T < 300 sec. The IF output phase variation is smaller than 3.5° rms typically, and the specification is less than 4.5° rms. The measured IF output power level is -28 to -30.5 dBm with 300K input load. The measured IF output power flatness is less than 5.6 dB for 2GHz window, and 1.3dB for 31MHz window. The first batch of prototype cartridges will be installed on site for further commissioning on July of 2017.

Published
2016
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30. An independently tunable dual-band bandpass filter using open-loop resonators.

Author

Chang, Huo-Ying, Weng, Ro-Min, and Kuo, Yue-Fang

Subjects
RESONATORS, BANDPASS filters, WIRELESS communications, MICROSTRIP transmission lines, BANDWIDTHS
Abstract

Based on open-loop resonators (OLRs), an independently tunable dual-band (ITDB) bandpass filter (BPF) is presented in this paper. The top layer of the proposed ITDB-BPF is composed of transmission feed lines and OLRs in a stepped-impedance resonator (SIR) structure. The bottom layer is constructed by OLRs in an asymmetrical SIR with a defect-grounded structure. To obtain the required frequencies and bandwidths, the sizes of resonators and feed lines are realized by defining the coupling coefficients and the external quality factors. As to the proposed ITDB-BPF, the first center frequency is set to be 2.45 GHz for Wireless Local Area Network systems. The second center frequency is selected to be 3.5 GHz for a Worldwide Interoperability for Microwave Access systems. The measurement results show that the insertion losses are 2.9 and 2.6 dB for 2.4 and 3.5 GHz, respectively. The minimum return losses are 14.5 dB for 2.4 GHz and 22.8 dB for 3.5 GHz. The stopband rejections of the lower band from dc to 1.84 GHz and the upper bands from 4.34 to 6 GHz are both greater than 30 dB. The center frequencies of the two passbands can be tuned independently by adjusting different resonators which makes the design of dual-band BPF more flexible than conventional ones. [ABSTRACT FROM PUBLISHER]

Published
2015
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32. A broadband phase-locked Ka-band single-tuning VCO with reconfigurable loop filters.

Author

Kuo, Yue-Fang, Chiong, Chau-Ching, and Hwang, Yuh-Jing

Abstract

A broadband phase-locked oscillator (PLO) based on Ka-band single tuning voltage-controlled oscillator (VCO) module is designed, fabricated and measured. The configuration based on the frequency offset dividing phase-locked loop was realized with a simple VCO module, a phase-locked loop board, and an image-rejection mixer. The locking range of the PLO system covers the whole 4.6 GHz VCO tuning range. An adaptive bandwidth theory is used to overcome problems caused by large variation of the VCO tuning sensitivity and to improve the in-band phase noise of PLO by at least 17 dB. The experimental results show that the in-band phase noise of −96 dBc/Hz at offset frequency of 10 kHz is achieved with the loop bandwidth of 1 MHz. The measured RMS jitter of the PLO at 37.8 GHz is 31 fs for 1 kHz to 100 kHz frequency offset range. [ABSTRACT FROM PUBLISHER]

Published
2011

33. Band-1 receiver front-end cartridges for Atacama Large Millimeter/submillimeter Array (ALMA): design and development toward production

Author

Holland, Wayne S., Zmuidzinas, Jonas, Hwang, Yuh-Jing, Chiong, Chau-Ching, Huang, Yau-De, Huang, Chi-Den, Liu, Ching-Tang, Kuo, Yue-Fang, Weng, Shou-Hsien, Ho, Chin-Ting, Chiang, Po-Han, Wu, Hsiao-Ling, Chang, Chih-Cheng, Jian, Shou-Ting, Lee, Chien-Feng, Lee, Yi-Wei, Pospieszalski, Marian, Henke, Doug, Finger, Ricardo, Tapia, Valeria, and Gonzalez, Alvaro

Published
2016
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