ISSTT Proceedings

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FANATIC: An SIS Radiometer for Radio Astronomy in the 660-690 GHz Band

Authors:
A.I. Harris, K.-F. Schuster, K.-H. Gundlach, B. Plathner
Abstract:
FANATIC is a compact radiometer optimized for radio astronomy from about 660 to 690 GHz ([lambda][lambda] 455 —435 µm). We observed a large number of molecular and atomic spectral lines from galactic and extragalactic sources during FANATIC's first run on the James Clerk Maxwell Telescope in early March 1994. Double sideband receiver temperatures during observations were about 800 K (25 hv/k). The heart of the receiver is a two-junction Nb/AlOx/Nb SIS array fed by a sandwiched V-Antenna. The junction array and antenna are fabricated together at IRAM's Grenoble SIS laboratory. Each junction has a normal resistance of Rn ~10 [Omega], an area of ~2 µm² , an individual radial stub circuit to resonate the capacitance, and a [lambda]/4 transformer to match to the antenna. The solid-state local oscillator is a mm-wave Gunn oscillator followed by a doubler and tripler. The LO diplexer is a Martin—Puplett interferometer, which insures that there is always abundant LO power for operation and speedy tuning. The receiver and telescope coupling optics, LO, dewar, and calibration system fit on an 0.6 × 0.8 m optical breadboard.
Categories:
SIS Receivers
Year:
1994
Session:
1
Full-text:
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Page Number(s):
91-108