ISSTT Proceedings

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A Local Oscillator System for the FIRST Heterodyne Instrument

Authors:
Gerhard W. Schwaab, John C. Pearson, Nicholas D. Whyborn
Abstract:
The Heterodyne Instrument for FIRST (HIFI) shall cover the full frequency range from 480 to 1250 GHz plus two additional parts of the spectrum around 1.6 and 2.6 THz. To be able to cover this frequency range, the Focal Plane Unit and the Local Oscillator Unit of HIFI will be split into 6 channels. The Local Oscillator Unit will be located at the outside of the satellite's LHe dewar and will be operated at a temperature of about 100 K. Each of the channels I to 5 consists of 2 chains of wide bandwidth HEMT power amplifiers in the 60 to 110 GHz range feeding wide band planar multipliers. To provide enough output power to pump two mixers at perpendicular polarizations wire grid beam splitters will be used. The amplifiers are fed by an actively multiplied tunable YIG oscillator which is located in the ambient temperature service module part of the satellite. The 66 channel is split into a 1.6 and a 2.6 THz part. Here, optical mixing in LTG GaAs will provide the LO power to feed a set of BEB mixers. The overall LO system design as well as the necessary development program are described.
Categories:
Multipliers, Sources
Year:
1998
Session:
8
Full-text:
Download a PDF of this paper.
Page Number(s):
463-471