Title :
A microwave Gaussian-beam launcher with an active aperture-blockage to control the spot-size of the beam
Author :
Gu, Chaoli ; Neelakanta, Perambur S. ; Ungvichian, Vichate ; Wahid, Parveen F.
Author_Institution :
Dept. of Electr. Eng., Florida Atlantic Univ., Boca Raton, FL, USA
fDate :
3/1/1994 12:00:00 AM
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
Keywords :
active antennas; electromagnetic launchers; horn antennas; lens antennas; AgI; AgI-pellet; active aperture-blockage; dielectric hyperhemisphere; dielectric lens; microwave Gaussian-beam launcher; open-ended scalar-horn; spot-size; superionic conductor; Bandwidth; Electromagnetic heating; Gallium arsenide; Gaussian processes; Heterojunction bipolar transistors; Optical mixing; Optical receivers; Optical sensors; Radio frequency; Wideband;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
