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A 220 GHz Orthogonal Modulator Based on Subharmonic Mixers Using Anti-Paralleled Schottky Diodes

Chinese Journal of Electronics 2022年第3期31卷 562-568页

作者： HE Yue LIU Ge LIU Juan LIN Changxing SU Wei Microsystem and Terahertz Research Center China Academy of Engineering Physics Institute of Electronic Engineering China Academy of Engineering Physics

In this paper, A 220 GHz orthogonal modulator based on two symmetrical subharmonic mixers is designed, analyzed and measured, where the mixers are implemented basde on antiparallel Schottky *** orthogonal modulator consists of a 90° phase shifted220 GHz 3 d B coupler, two sub-harmonically pumped mixers and an in-phase 110 GHz 3 d B power divider. The IF output signals are in-phase(I) branch and quadrature(Q) branch operating from DC±3.5 GHz. In the back to back experimentaltests, it is shown that the conversion loss of the two 220 GHz I/Q mixers is less than 30 d B when the IF operating frequency is DC-3.5 GHz, IF input power is-10 d Bm and the LO power is around 6 m W. Based on floating-point simulation, the amplitude and phase imbalance of the I/Q mixer are less than 0.2 d B and 2 degree respectively. When the 220 GHz modulator and demodulator are set in a back to back configuration, a signal-to-noise ratio of 21 d B can be obtained using the 16 qam modulation type.

关键词： subharmonic mixers amplitude imbalance I-Q mixer floating-point simulation power dividers millimetre wave mixers millimetre wave diodes waveguide couplers quadrature amplitude modulation Schottky diode mixers radio-over-fibre phase imbalance orthogonal modulator power divider 16 qam modulation subharmonically pumped mixers quadrature branch in-phase branch antiparalleled Schottky diodes waveguide coupler

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