ISSTT Proceedings

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Twin-slot Multi-layer Substrate-supported Antennas and Detectors for Terahertz Imaging

Authors:
Stuart M. Wentworth, Robert L. Rogers, John G. Heston, Dean P. Neikirk
Abstract:
Planar antenna arrays with integrated detectors have proven to be very useful for millimeter and submillimeter wave receiver systems. One problem with planar antennas is their tendency to couple significant power into guided modes (also called surface waves) when the substrate is a significant fraction of a dielectric wavelength [lambda]d thick. Coupling into these surface waves can be avoided by making the substrate very thin (on the order of 50 ┬Ám or less for far-infrared radiation), or by making the substrate appear infinitely thick by placing a focusing lens on back of the substrate. Unfortunately, substrate lenses tend to be quite lossy in the terahertz regime, while membrane-supported devices present difficult fabrication challenges. A third approach involves the use of electrically thick substrates of carefully chosen thickness, in conjunction with an antenna design which suppresses surface wave coupling. In this paper we will discuss twin-slot antennas supported on a multilayer dielectric stack, which show both good patterns and efficiencies. The dielectric layers used are thick enough to be handled with conventional fabrication equipment. The appropriate choice of dielectric stack also allows the beamwidth to be adjusted, providing a good match between the antenna and optical system feed patterns. In addition, we will also discuss new integrated microbolometer configurations which should be more sensitive than conventional microbolometers for terahertz detection. The combination of these antennas and detectors may allow the fabrication of imaging arrays with higher sensitivities than those currently available.
Categories:
Antennas & Telescopes, Circuits
Year:
1990
Session:
2
Full-text:
Download a PDF of this paper.
Page Number(s):
201-213