Abstract
We describe the design of a highly integrated cryogenic receiver module based on an waveguide Orthomode Transducer (OMT) for dual-polarization radio astronomy observations across 75-116 GHz (3-mm band). The receiver module consists of passive and sections incorporated in three mechanical blocks arranged in a very compact assembly. The module has external dimensions of 43×25×35 mm3; it includes a square waveguide input (size 2.54×2.54 mm2) and two standard WR10 waveguide outputs (size 1.27×2.54 mm2) parallel to the input waveguide, suitable for integration in a focal plane array.The passive section of the receiver module employs a broadband backward-coupler waveguide while the section consists of two ultra-low noise MMIC (Monolithic Microwave Integrated Circuit) amplifiers in cascade, delivering a total gain of ≈45 dB for each of the polarization channels. The active OMT receiver will be cryogenically cooled at the physical temperature of ≈15 K. It is expected to provide state-of-the-art performance with noise in the range 25 to 50 K across 75-116 GHz. The module incorporates a DC power supply board along with discrete capacitors, resistors and DC bias connector for biasing the MMIC amplifiers.
Published Version
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