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Proceedings Paper

Experimental analysis of metal coated dielectric waveguides
Author(s): C. S. Yeh
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Paper Abstract

In this paper we have investigated the experimental characteristics of metal coated dielectric waveguides with a rectangular surface corrugation. The waveguide is designed to operate at a second Bragg frequency of 90 GHz. The period, height and the duty cycle of the rectangular grating were calculated from the chosen frequency. A metallic layer of aluminum is sputtered on one side of the slab waveguide. The purpose of the metallic layer is to simulate a layer of high density plasma on the surface of the waveguide instead of using an optical source. Experiments are performed to examine the far field radiation pattern, attenuation constant and the dispersion relation. Due to the presence of the plasma layer there will be an angular shift in the far field radiation pattern. We have observed a phaseshift of about 20° in the radiation pattern of the waveguide before and after coating the metallic layer. Measurements are made in the frequency range of 88-95 GHz. This waveguide structure can be used to de sign an electronically steerable antenna and an electronic phaseshifter operating in the millimeter-wave frequency band. The experimental results are in good agreement with the theory. This way we have verified the grating theory experimentally.

Paper Details

Date Published: 14 December 1992
PDF: 2 pages
Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19293Y (14 December 1992); doi: 10.1117/12.2298259
Show Author Affiliations
C. S. Yeh, Southern Methodist Univ. (United States)


Published in SPIE Proceedings Vol. 1929:
17th International Conference on Infrared and Millimeter Waves
Richard J. Temkin, Editor(s)

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