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Compact dual-polarization cryogenic receiver module for the 75-116 GHz band

: Navarrini, Alessandro; Valente, Giuseppe; Serres, Patrice; Schäfer, Frank; Thome, Fabian; Garnier, Olivier


Politecnico di Torino; Institute of Electrical and Electronics Engineers -IEEE-; IEEE Antennas and Propagation Society; International Union of Radio Science -URSI-:
International Conference on Electromagnetics in Advanced Applications, ICEAA 2018. Proceedings : Cartagena de Indias, 10 - 14 September 2018
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-6762-0
ISBN: 978-1-5386-6761-3
ISBN: 978-1-5386-6763-7
International Conference on Electromagnetics in Advanced Applications (ICEAA) <20, 2018, Cartagena>
Fraunhofer IAF ()
Orthomode Transducer (OMT); MMIC; low-noise amplifier (LNA); integrated receiver; millimeter-wave radio astronomy

We describe the design of a highly integrated cryogenic receiver module based on an "active" waveguide Orthomode Transducer (OMT) for dual-polarization radio astronomy observations across 75-116 GHz (3-mm band). The receiver module consists of passive and active sections incorporated in three mechanical blocks arranged in a very compact assembly. The module has external dimensions of 43×25×35 mm 3 ; it includes a square waveguide input (size 2.54×2.54 mm 2 ) and two standard WR10 waveguide outputs (size 1.27×2.54 mm 2 ) 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 OMT while the active 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.