A microwave Gaussian-beam launcher with an active aperture-blockageto control the spot-size of the beam |
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Authors: | Gu C Neelakanta PS Ungvichian V Wahid PF |
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Affiliation: | Dept. of Electr. Eng., Florida Atlantic Univ., Boca Raton, FL; |
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Abstract: | 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 |
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