https://scholars.lib.ntu.edu.tw/handle/123456789/333604
標題: | Submillimeter-wave phasor beam-pattern measurement based on two-stage heterodyne mixing with unitary harmonic difference | 作者: | Y. J. Hwang R. Rao R. Christensen M. T. Chen TAH HSIUNG CHU |
關鍵字: | A near-field phasor beam measurement system is developed for the characterization of heterodyne receiver optics at submillimeter-wave frequencies. The system synthesizes a pair of submillimeter-wave signals as the RF and local oscillator (LO) sources from common reference sources. The synthesized harmonic numbers of the RF and LO sources are arranged with difference by one, which makes this a new configuration with a unitary harmonic difference. The coherent RF and LO signal are down-converted by the receiver under test, then mixed with the microwave-frequency common reference signal to generate the second-order IF signal around 100 MHz for amplitude and phase comparison. The amplitude and phase fluctuation of the measurement system at 683 GHz is within ±0.2 dB and ±4° in a 1-h period, respectively. The system dynamic range at 683 and 250 GHz can be as high as 43 and 47 dB, respectively. The system is then used to measure the receiver beam patterns at 683 and 250 GHz with different RF transmitting probe antennas. © 2007 IEEE. | 公開日期: | 六月-2007 | 卷: | 55 | 期: | 6 | 起(迄)頁: | 1200-1207 | 來源出版物: | IEEE Transactions on Microwave Theory and Techniques | URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/333604 https://www.scopus.com/inward/record.uri?eid=2-s2.0-34250220028&doi=10.1109%2fTMTT.2007.897843&partnerID=40&md5=7905ea2b8ddefe9d0a28b1d33a29c5b5 |
ISSN: | 00189480 | DOI: | 10.1109/TMTT.2007.897843 | SDG/關鍵字: | Frequency conversion; Gaussian beams; Phase measurement; Submillimeter-wave receivers |
顯示於: | 電機工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。