Q-band receiver system design for the Canadian DVA-2 radio telescope

S. Salem Hesari; D. Henke; V. Reshetov; F. Jiang; A. Seyfollahi; L. B. G. Knee; L. Baker; J. Bornemann; D. Chalmers

doi:10.1117/12.2562751

13 December 2020 Q-band receiver system design for the Canadian DVA-2 radio telescope

S. Salem Hesari, D. Henke, V. Reshetov, F. Jiang, A. Seyfollahi, L. B. G. Knee, L. Baker, J. Bornemann, D. Chalmers

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114533A (2020) https://doi.org/10.1117/12.2562751
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

A compact front-end system is presented for a dual-linear polarization cryogenic Q-band receiver. This receiver will be used to demonstrate the high frequency performance of the Dish Verification Antenna 2 (DVA-2) composite reflector telescope between 35–50 GHz and is a technology demonstrator with possible application to the National Radio Astronomy Observatory’s Next Generation Very Large Array (ngVLA). A vacuum vessel and a two-stage Gifford-McMahon cryopump system are used for the cryogenic environment. The second stage of the cryostat is cooled to 16 K and includes a small choke ring feed horn, a low-loss noise calibration module (NCM) integrated with orthogonal mode transducer (OMT), and two cryogenically cooled mHEMT MMIC low-noise amplifiers (LNAs). Using a noise diode as the noise source on the 300 K stage inside the cryostat helps to protect the cooled components from signals outside of the cryostat, and also lessen the heat on the second stage since a noise diode normally produce a power dissipation of several hundred mW. The OMT design is an optimized version of the design used in the ALMA Band 1 cartridge with two integrated directional couplers and excellent performance. The cascaded noise analysis of the receiver shows a receiver noise temperature of 19.4 K.

Conference Presentation

Citation Download Citation

S. Salem Hesari, D. Henke, V. Reshetov, F. Jiang, A. Seyfollahi, L. B. G. Knee, L. Baker, J. Bornemann, and D. Chalmers "Q-band receiver system design for the Canadian DVA-2 radio telescope", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114533A (13 December 2020); https://doi.org/10.1117/12.2562751

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