DOI: 10.1109/TMTT.2024.3447762   IEEEXplore: https://ieeexplore.ieee.org/document/10663289    

Cryogenic quasi-optical Schottky subharmonic in-phase quadrature (IQ) demodulation receiver

220 GHz

A dual-band, dual-beam antenna comprising a monopole lens and a microstrip patch array achieves superior spatial separation of the local oscillator and the radio frequency coupling signal. This particular quasi-optical design also improves thermal isolation for the cryogenic electronic systems and avoids the beam-splitter losses of conventional quasi-optical receivers. A compact dual-band quadrature hybrid-based IQ demodulator reduces complexity and lowers insertion loss compared to established design approaches.

High sensitivity terahertz imaging, sensing and communication applications.

-12 dB single sideband (SSB) conversion gain (CG), 3 dB double sideband (DSB) Noise Factor (NF) from 212 - 220 GHz at 60 K.