Communications: radio wave antennas – Antennas – Microstrip
Patent
1983-06-15
1986-05-20
Lieberman, Eli
Communications: radio wave antennas
Antennas
Microstrip
343770, H01Q 138
Patent
active
045904782
ABSTRACT:
A microwave antenna (10) is excited by two independently driven feed lines (30 and 32) so that the plane of polarization of the resultant microwave radiation depends on the relative amplitudes of the signals on the two feed lines. The feed lines are disposed between two parallel ground planes (12 and 14), in one of which is etched an aperture (18). The periphery of the aperture forms ridges (20, 22, 24, and 26) in registration with the feed lines (30 and 32). Conductive eyelets (27) extend between the ground-plane conductors (12 and 14) to act as shorting elements that surround the aperture to form a cavity defined by the shorting elements and the ground-plane conductors. The resultant antenna, which may, for instance, have a thickness of only one-tenth of a wavelength, achieves a 2:1 VSWR bandwidth on the order of 30%.
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Johnson et al, "Antenna Engineering Handbook" Ch. 7, Microstrip Antennas pp. 7-1 to 7-18, Published by McGraw-Hill, New York, 1984.
Greiser, "Coplanar Stripline Antenna", Microwave Journal, Oct. 1976, pp. 47-49.
Arkind Kenneth D.
Powers Richard L.
Price Richmond W.
Etlinger Louis
Lieberman Eli
Sanders Associates Inc.
Weinstein Stanton D.
Wimer Michael C.
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