ISSTT Proceedings

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Antennas for Sub-Millimetre Wave Receivers

Authors:
Joakim F. Johansson, Nicholas D. Whyborn, Pranay Raj Acharya, Hans Ekström, Stellan W. Jacobsson, Erik L. Kollberg
Abstract:
This paper reports on investigations of two antenna types which are suitable for implementation at sub-millimetre wavelengths; the diagonal horn and the sandwiched tapered slot antenna. The diagonal horn is studied theoretically by expanding the aperture electric field into Gauss-Hermite modes. A few of these modes are then used to model the radiation pattern. The results Indicate that the fraction of the power radiated into the fundamental Gaussian mode is about 84 0/0. About 10 % of the power is radiated in the cross-polarised component. Radiation patterns for a 4 × 4 diagonal horn array, measured at 100 GHz, show good agreement with the theoretical predictions. The sandwiched tapered slot antenna consists of a slotline antenna which is sandwiched between thick quartz super- and substrates. An elliptical lens is used to collimate the beam. Model experiments have been performed at 30 and 350 GHz. The radiation patterns are worse at the higher frequency, probably due to alignment problems.
Categories:
Antennas & Telescopes
Year:
1991
Session:
1
Full-text:
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Page Number(s):
63-81