A 345GHz SIS receiver for radio astronomy

Astronomy and Astrophysics – Astronomy

Scientific paper

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38

Mixing Circuits, Noise Temperature, Radio Astronomy, Radio Receivers, Sis (Superconductors), Submillimeter Waves, Double Sideband Transmission, Electron Tunneling, Liquid Helium, Rectangular Waveguides

Scientific paper

A 345-GHz SIS tunnel junction receiver utilizing a full height rectangular waveguide mixer with two tuning elements (an E-plane and backshort tuner) has been constructed and installed on the Caltech Submillimeter Observatory 10-m antenna at Mauna Kea, Hawaii. The receiver exhibits a best double side-band noise temperature response of 150 K + or - 20 K (averaged over a 500-MHz IF bandwidth centered at 1.5 GHz) at a design center frequency of 345 GHz and at an ambient temperature of approximately 3.8 K. Additional measurements show that the receiver has an excellent response at selected points within an RF input range of 280 to 363 GHz.

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