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|Title:||Architecture of Highly Integrated Cryogenic Active Planar OrthoMode Transducer for the 3-mm Band||Authors:||Valente, G.
|Issue Date:||2018||Volume:||2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC)||First Page:||1||Abstract:||We describe the design concepts of two highly integrated cryogenic receiver modules based on “active” planar Orthomode Transducers (OMTs) for dual-polarization radio astronomy observations across 75-116 GHz (3-mm band). Both OMTs share common features and comprise active parts with MMIC (Monolithic Microwave Integrated Circuit) Low Noise Amplifier (LNA) chips, each with ≈20 dB gain, and DC power supply boards located inside a mechanical assembly consisting of three blocks. The mechanical structure incorporates a circular waveguide input (diameter 3 mm) that transitions the signals to four symmetrical double-balanced microstrip probes, two rectangular waveguide 180 deg power combiners, a stripline crossover section, and two oval waveguide outputs (external dimensions of 2.85x1.27 mm2). The MMIC LNA chips are electrically close to the OMT circular waveguide input, thus resulting in low insertion loss before the RF signal amplification, which is key to achieve low-noise receiver performance. The two planar OMT designs differ on the MMIC number (one with 8 MMICs, the other with 6 MMICs) and on the output waveguide transitions. In both OMT designs, the two output waveguides are parallel to the input waveguide axis; this feature is desirable for use of the OMTs in focal plane arrays in order to minimize the single-pixel footprint size. The receiver modules are designed to have a maximum footprint in the direction orthogonal to the optical axis of 44x44 mm2.||Conference Name:||2018 2nd URSI Atlantic Radio Science Conference (AT-RASC)||Conference Place:||Gran Canaria, Spain||Conference Date:||28 May-1 June, 2018||URI:||http://hdl.handle.net/20.500.12386/28246||URL:||https://ieeexplore.ieee.org/document/8471471||ISBN:||978-90-82598-73-5
|Appears in Collections:||3.01 Contributi in Atti di convegno|
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|Active_Planar_OMT_submitted.pdf||postprint||610.16 kB||Adobe PDF||View/Open|
|ActivePlanarOMT.pdf||[Administrators only]||1.12 MB||Adobe PDF|
checked on Jan 19, 2021
checked on Jan 19, 2021
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