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24 September 2012 A 3mm band dual polarization MMIC receiver for the 30-m Pico Veleta Radio Telescope
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Abstract
We present the design, construction and test results of a prototype MMIC receiver for the 3 mm band (84-116 GHz). The receiver cryogenic module consists of a single corrugated feed horn cascaded with an Ortho Mode Traducer (OMT) that splits the two incoming linear polarized signals in two independent single-mode rectangular waveguides. Low noise MMIC HEMT amplification modules, attached to the OMT WR10 waveguide outputs, amplify the signal of each polarization channel. Outside the dewar, each signal is filtered, down-converted, and further amplified to provide a final 8 GHz IF bandwidth across 4-12 GHz. The receiver was installed on the Pico Veleta 30 m telescope in August 2010 where it was used to perform spectral line surveys of astronomical sources. The measured receiver noise temperature was below 75 K with an average value of ~55 K for both polarization channels across 84-116 GHz.
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Patrice Serres, Olivier Garnier, Yves Bortolotti, Santiago Navarro, Dave John, Bruno Pissard, Alessandro Navarrini, and Karl F. Schuster "A 3mm band dual polarization MMIC receiver for the 30-m Pico Veleta Radio Telescope", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84522X (24 September 2012); https://doi.org/10.1117/12.926203
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