Multi-frequency Dual-polarization Spaceborne Microwave Radiometer Antennas

As part of the overall Haiyang2C (HY2C) ocean dynamic satellite research, atmospheric correction microwave radiometer(ACMR) used to correct atmospheric path delay in the radar altimeter has recently been developed. Observing antenna of ACMR with three frequency bands and dual polarizations is realized by an offset deployable dish fed by a common corrugated horn. The deployable reflector is made of carbon fiber composite (CFRP) supported by a frame that connect to the satellite deck, and the deployment of the dish is implemented by two hinges. The feeding subsystem has a loaded rings corrugated horn, an ultra wideband orthomode transducer(OMT) that covers almost 2:1 bandwidth ratio followed by bandpass filters. Measured results show that the VSWRs are lower than 1.5 throughout all three working bands, the cross-polarization levels (CPs) are below -20 dB, and the main beam efficiency(MBE) is above 90%.