亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        Design of Subharmonic Mixers above 100 GHz

        2013-11-26 10:48:14BoZhangGeLiuZheChenXiaoFanYangNingBoChenSanTongWuandYongFan

        Bo Zhang, Ge Liu, Zhe Chen, Xiao-Fan Yang, Ning-Bo Chen, San-Tong Wu, and Yong Fan

        1.Introduction

        The development of low-loss, heterodyne detection systems operating at terahertz frequency band[1]-[3], is essential for applications including radiometers, radar systems, and communication systems.Despite the progress of submillimeter-wave low-noise amplifiers[4], Schottky mixers are still used as the first element of receiver front-ends to down-convert the signal collected by the antenna to microwave frequencies where it can be amplified and analyzed more easily.Schottky mixers have the advantage over other sensor technologies to work at room temperature as well as cryogenic temperatures for improved noise performance, which make them the technology of choice for long-term applications[5],[6].

        2.Design

        To design the subharmonic mixer successfully, two circuit simulation tools are implemented, advanced design system (ADS) and high frequency structure simulator(HFSS).For nonlinear circuit analysis, ADS based on the harmonic balance technology is used.And HFSS offers the linear electromagnetic solution to the specified physical structure based on the finite element analysis.

        For the linear embedding circuit, aiming to reduce the requirements for the computer memory and computation time during HFSS simulation, the structure was divided into four functional parts which can be solved individually,namely, 1) the local oscillator (LO) input waveguide transition to suspended microstrip including the IF low band pass filter, 2) the low band pass filter which will stop RF frequency while pass LO and IF frequency, 3) the anti-parallel planar Schottky diodes and nearby suspended microstrip, and 4) the transition from microstrip to radio frequency (RF) input waveguide.Finally, all the functional parts were integrated in HFSS for a complete linear electromagnetic structure simulation to achieve desired performance.As a consequence, the generalized S-matrix from the four HFSS models were imported into ADS and connected with suspended microstrip lines.In the ADS simulator, harmonic balance analysis was launched to evaluate the simulated performance of the full structure.If the simulation results were not satisfying, the sub-harmonic mixer structure in HFSS should be re-optimized.

        3.Mixer performance

        3.1 110 GHz to 130GHz Subharmonic Mixer

        The simulated and the measured best double-sideband(DSB) conversion loss is shown in Fig.1.A DSB conversion loss of 4.7 dB was achieved with 8 mW of LO power at 1.2 GHz IF.Over an RF band of 14 GHz, the DSB conversion loss is below 9 dB.The actual photograph of the subharmonic mixer is shown in Fig.2.

        Fig.1.Simulated and measured DSB conversion loss of the subharmonic mixer for a fixed IF frequency of 1 GH to 1.5 GHz.

        Fig.2.Actual photograph of the receiver composing a subharmonic mixer and a GaAs Gunn oscillator.

        Fig.3.Simulated conversion loss of the subharmonic mixer driven by different LO powers.

        Fig.4.Completed mixer block before assembly.

        3.2 215-235 GHz Subharmonic Mixer

        Motivated by the LO between 5 mW to 10 mW, the simulated conversion loss of the subharmonic mixer is shown in Fig.3.The lowest conversion loss is driven by 7 mW of the LO power.The mixer block shown in Fig.4 has been fabricated and is currently waiting to be tested.

        3.3 310 GHz to 350 GHz Subharmonic Mixer

        Motivated by the LO between 3 mW to 8 mW, the simulated conversion loss of the subharmonic mixer is shown in Fig.5.The lowest double sideband conversion loss performance of 5.7 dB is driven by 5 mW of the LO.The mixer block shown in Fig.6 has been fabricated and is currently waiting to be tested.

        Fig.5.Simulated conversion loss of the subharmonic mixer driven by different LO powers.

        Fig.6.Completed mixer block before assembly.

        Fig.7.Configuration of 220 GHz TMIC membrane sub-harmonic mixer circuit.

        3.4 225 GHz TMIC Subharmonic Mixer

        As the frequency increases, the TMIC technology is adopted.Fig.7 shows the configuration of the 225 GHz TMIC membrane sub-harmonic pumped mixer circuit.Fig.8 shows the simulated conversion loss and noise figure over the RF frequency band.The 220 GHz mixer yielded conversion loss and noise figure of 6.7 dB and 2.9 dB respectively and the 3 dB bandwidth is about 16%,operating from 205 GHz to 240 GHz.Fig.9 shows that both the optimum conversion loss and noise figure can be obtained when the LO drive power is 4 dBm.

        Fig.8.Simulated conversion loss and noise figure over the RF frequency band.

        Fig.9.Simulated conversion loss and noise figure at LO drive power from 0 dBm to 7 dBm.

        Fig.10.Simulated conversion loss of 425 GHz MMIC membrane sub-harmonic mixer over RF frequency band.

        3.5 425 GHz TMIC Subharmonic Mixer

        The simulated result is shown in Fig.10.The optimized conversion loss of the 425 GHz mixer is less than 7 dB.

        4.Conclusions

        Several mixers using planar schottky diode flip-chipped mounted onto a suspended quartz-based substrate and integrated with GaAs substrate were successfully designed respectively and the 115 GHz subharmonic mixer with flip-chipped diode has been fabricated and tested.A best DSB conversion loss of 4.7 dB of the mixer was achieved with 8 mW of LO power at 1.2 GHz IF.Over an RF band of 14 GHz, the DSB conversion loss is below 9 dB.The simulated and tested results have shown that the technique used in the device above is a feasible approach for sub-harmonic mixer design.

        [1]J.L.Hesler, W.R.Hall, T.W.Crowe, R.M.Weikle, B.S.Deaver, Jr., R.F.Bradley, and S.K.Pan, “Fixed-tuned sub-millimeter wavelength waveguide mixers using planar Schottky barrier diodes,” ⅠEEE Trans.Microwave Theory &Tech., vol.45, no.5, pp.653–658, 1997.

        [2]D.Porterfield, J.L.Hesler, T.W.Crowe, W.L.Bishop, and D.Woolard, “Integrated terahertz transmit/receive module,”in Proc.of the 33rd European Microwave Conf., Munich,2003, 1319–1322.

        [3]B.Thomas, A.Maestrini, J.Gill, C.Lee, R.Lin, I.Mehdi,and P.de Maagt, “A broadband 835-900GHz fundamental balanced mixer based on monolithic GaAs membrane Schottky diodes,” presented at IEEE-MTT Special Issue on“THz Technology: Bridging the Microwave-to-photonics Gap, 2010.

        [4]T.Gaier, L.Samoska, A.Fung, W.R.Deal, V.Radisic, X.B.Mei, W.Yoshida, P.H.Liu, J.Uyeda, M.Barsky, and R.Lai,“Measurement of a 270 GHz low noise amplifier with 7.5 dB noise figure,” ⅠEEE Microwave Wireless Compon.Lett., vol.17, no.7, pp.546–548, 2007.

        [5]B.Thomas, A.Maestrini, and G.Beaudin, “A low-noise fixed-tuned 300-360-GHz sub-harmonic mixer using planar Schottky diodes,” ⅠEEE Microwave and Wireless Components Letters, vol.15, no.12, pp.865–867, 2005.

        [6]S.Marsh, B.Alderman, D.Matheson, and P.de Maagt,“Design of low-cost 183 GHz subharmonic mixers for commercial applications,” ⅠET Circuits Devices Syst., vol.1,no.1, pp.1–6, 2007.

        少妇av免费在线播放| 男女啪啪视频高清视频| 大肉大捧一进一出好爽视频动漫| 97久久精品无码一区二区天美| 三级网址在线| 日本女优在线观看一区二区三区| 国产午夜免费一区二区三区视频| 久久精品国产清自在天天线| 婷婷丁香五月中文字幕| 亚洲va在线va天堂va四虎| 在线小黄片视频免费播放| 优优人体大尺大尺无毒不卡| 无遮无挡爽爽免费视频| 正在播放淫亚洲| 色婷婷久久综合中文久久一本| 人妻少妇-嫩草影院| 综合无码一区二区三区| 波多野结衣一区二区三区视频| 中文亚洲一区二区三区| 成人艳情一二三区| 精品国产18久久久久久| 98精品国产高清在线xxxx| 青青草免费在线视频久草| 国产欧美亚洲精品第一页| 亚洲最大中文字幕无码网站| 日本精品久久久久中文字幕1| 天天色天天操天天日天天射| 无码人妻人妻经典| 在线免费观看国产精品| 日韩一区二区,亚洲一区二区视频| 婷婷色婷婷开心五月四| 18分钟处破好疼哭视频在线观看| 日韩中文在线视频| 亚洲一区在线二区三区| 国产欧美一区二区精品久久久| 鲁一鲁一鲁一鲁一澡| 国产三级黄色的在线观看 | 国产成年人毛片在线99| 中文字幕在线观看亚洲日韩| av深夜福利在线| 中文字幕亚洲五月综合婷久狠狠|