Abstract
A dual-polarization balanced superconductor–insulator–superconductor mixer operating at $\text{2}\text{ mm}$ wavelength is realized in the form of a monolithic planar integrated circuit. Planar orthomode transducers and local oscillator (LO) couplers are enabled by using silicon membranes that are locally formed on the silicon-on-insulator substrate. The performance of the balanced mixer is experimentally investigated. Over the entire RF band ( $\text{125}\text{--}\text{163}\,\text{GHz}$ ), the balanced mixer shows an LO noise rejection ratio of about $\text{15}\,\text{dB}$ , an overall receiver noise about $\text{40}\,\text{K}$ , and a cross polarization $ . The demonstrated compactness and the performance of the integrated circuit indicate that this approach is feasible in developing heterodyne focal plane arrays.
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