A microwave Gaussian-beam launcher with an active aperture-blockage to control the spot-size of the beam

A method of controlling the spot-size of a focused microwave Gaussian-beam using an active aperture-blockage is described. The Gaussian-beam launcher consists of an open-ended scalar-horn with a dielectric hyperhemisphere at its aperture. Also included is an AgI-pellet at the aperture-center with a...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1994-03, Vol.42 (3), p.520-522
Main Authors: Gu, C., Neelakanta, P.S., Ungvichian, V., Wahid, P.F.
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Bandwidth
Electromagnetic heating
Exact sciences and technology
Gallium arsenide
Gaussian processes
Heterojunction bipolar transistors
Optical mixing
Optical receivers
Optical sensors
Radio frequency
Radiocommunications
Telecommunications
Telecommunications and information theory
Wideband
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Summary:A method of controlling the spot-size of a focused microwave Gaussian-beam using an active aperture-blockage is described. The Gaussian-beam launcher consists of an open-ended scalar-horn with a dielectric hyperhemisphere at its aperture. Also included is an AgI-pellet at the aperture-center with a provision to heat it with an external dc source. The scalar-horn plus the dielectric lens launch a Gaussian-beam; and, the AgI pellet when heated, becomes a superionic conductor offering an aperture-blockage. This results in a variation of the spot-size of the emergent-beam. Theoretical results and experimental data are furnished and compared.< >
ISSN:0018-9480
1557-9670
DOI:10.1109/22.277450