Design of 210-240GHz Subharmonically Pumped Mixer for Space-borne Receiver Front-end
The terahertz(THz) region of the electromagnetic spectrum, spanning from 100 GHz through 10 THz, become more and more import for a wide range scientific, military and commercial applications day by day. Subharmonically pumped mixer (SHM Mixer) for space-borne receiver front-end plays important role in terahertz communications. This paper presents the design of suspended 225GHz subharmoniclly pumped mixer for space-borne receiver front-end. Model details include reduced-high waveguide to suspended- microstrip step-impedance probe transition and sector radiation RF block low pass filter(LPF) were introduced by using ANSOFTs three-dimensional fullwave electromagnetic simulation software: HFSS. Compared with traditional probe transition, E-plane step-impedance probe transition could achieve characteristic of more higher transfer mode suppression and wider bandwidth. Sector radiation RF blocker low pass filter could achieve higher stopband rejection and could reduced circuit length by half at the same time, compare with traditional high/low step-impedance line LPF structure. This low-loss fixed-tuned 225GHz SHM mixer circuits are fully integrated with the RF/IF filter, pumped by planar GaAs schottky diodes fabricated by European company which were flip-chipped onto a suspended quartz-based substrate. This broadband subharmonic mixer is designed as a fix-tuned component with the least number of parts to minimize the cost and maximize its potential for volume manufacture. A best doublesideband-mixer loss of 8.8dB was achieved at RF 228GHz with 6mW of LO power. Over an RF band of 210~ 242GHz, the double-sideband loss is below 15dB. This state-of-the-art design is attributed to lower parasitic devices and a low-loss quartz suspended microstrip circuit waveguide circuit.
component terahertz(THz) Subharmonically pumped mixer (SHM Mixer) receiver front-end
Xiaofan Yang Bo Zhang Yong Fan F.Q Zhong Zhe Chen
EHF Key Laboratory of Fundamental Science University of Electronic Science and Technology of China Chengdu, 610054, P. R. China
国际会议
重庆
英文
680-683
2011-08-20（万方平台首次上网日期，不代表论文的发表时间）