ISSTT Proceedings

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An All-Solid-State - 1 THz - Radiometer For Space Applications

Authors:
Rüdiger Zimmermann, Thomas Rose, Thomas Crowe, Thomas W. Grein
Abstract:
A heterodyne receiver at 1 THz is described, whose components are waveguide mixer and frequency multipliers with Schottky-diodes as mixing and multiplying elements. Most important is the breakthrough in local-oscillator development: The power at the fundamental frequency is generated by an InP-Gunn-Oscillator which delivers 70 mW at 111.2 2 GHz. The output power from two cascade triplers (at the 9th-harmonic) was 60 µW (min.) Coupling of signal- and L.0.-power is achieved by a Martin-Puplett Interferometer. System noise temperature was determined with absorbers at room temperature and 77 K yielding Tsys = 8800 K (DSB) and total conversion loss = I3dB. Atmospheric losses appear to account for half of the noise temperature and 3dB conversion loss. The mixer is prepared for cooling to liquid nitrogen from which we hope for a further reduction in system noise of approximately a factor of two.
Categories:
Diodes, Receivers
Year:
1995
Session:
1
Full-text:
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Page Number(s):
13-27