Title :
A flying spot mirror at 94GHz
Author :
Wang, V.C. ; Case, W.E. ; Koch, M.E.
Author_Institution :
Loral Vought Systems Corp., Dallas, TX, USA
fDate :
June 28 1993-July 2 1993
Abstract :
The authors present the theoretical and experimental properties of a flying spot mirror (FSM) designed for operation at 94 GHz. The spatial domain of the mirror is a planar array of I-poles, each center-loaded with a small element of switchable, thin-film vanadium dioxide (VO/sub 2/). VO/sub 2/ undergoes a thermally induced semiconductor-to-metal phase transition near 65/spl deg/, which is accompanied by dramatic changes in electric and optical properties. If the conductance of the VO/sub 2/ film is changed from low (cold state) to high (hot state) over a 10/sup 4/ range, a surface reflectance variation of the mirror from 1% to 94% is predicted. A diffraction-limited area, or pixel, contains about thirty I-poles. The flying scheme is obtained by suitably programming the switching of the individual pixels.<>
Keywords :
electrical conductivity transitions; millimetre wave antenna arrays; mirrors; reflector antennas; semiconductor switches; semiconductor thin films; vanadium compounds; 94 GHz; VO/sub 2/ switchable thin film; conductance; diffraction-limited area; flying spot mirror; planar array of I-poles; programming; semiconductor-to-metal phase transition; surface reflectance variation; Conductive films; Frequency domain analysis; Frequency measurement; Mirrors; Optical films; Planar arrays; Reflectivity; Substrates; Testing; Time measurement;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1993. AP-S. Digest
Conference_Location :
Ann Arbor, MI, USA
Print_ISBN :
0-7803-1246-5
DOI :
10.1109/APS.1993.385329
