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Q-Band beam wave-guide

John, G (1980) Q-Band beam wave-guide. In: Journal of the Indian Institute of Science, 62 (9). pp. 159-170.

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Consideration is given to a 25-foot long Q-band (8 mm) confocal, zoned dielectric lens beam waveguide. Numerical expressions for the axial and radial fields are presented. The experimental set-up consisted of uniformly spaced zoned dielectric lenses, a transmitting horn and a receiving horn. It was found that: (1) the wave beam is reiterated when confocal, zoned dielectric lenses act as phase transformers in place of smooth surfaced transformers in beam waveguides; (2) the axial field is oscillatory near the source and the oscillation persists for about 25 cm from the source; (3) the oscillation disappears after one lens is used; (4) higher order modes with higher attenuation rates die out faster than fundamental modes; (5) phase transformers do not alter beam modes; (6) without any lens the beam cross-section broadens significantly in the Z-direction; (7) with one lens the beam exhibits the reiteration phenomenon; and (8) inserting a second lens on the axial and cross-sectional field distribution shows further the reiteration principle.

Item Type: Journal Article
Publication: Journal of the Indian Institute of Science
Publisher: J Indian Institute of science
Additional Information: Copyright of this article belongs to J Indian Institute of science.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 31 Dec 2010 08:14
Last Modified: 31 Dec 2010 08:16
URI: http://eprints.iisc.ac.in/id/eprint/34724

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