Communications: radio wave antennas – Antennas – Microstrip
Patent
1990-03-28
1991-04-09
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Microstrip
343830, H01Q 138
Patent
active
050068598
ABSTRACT:
A patch antenna is formed of one or more flat disc-shaped radiators disposed parallel to and spaced apart from a common ground-plane element. At each radiator, there is a feed assembly of two feeds positioned to one side of a center of the radiator in space quadrature and excited in phase quadrature for generating circularly polarized radiation from the radiator. Each of the feeds, in a preferred embodiment of the invention, is formed as a post extending through an aperture in the ground-plane element partway to the radiator for capacitive coupling with the radiator. At each radiator, a reactance element on the form of a capacitive block extends from the ground-plane element partway to the radiator at a location diametrically opposite the feed assembly. Capacitive reactance of the reactance element is approximately one order of magnitude less than the sum of the capacitive reactance of the two feeds at each radiator to reduce mutual coupling between the feeds of each radiator to counteract any elliptical polarization to produce accurately a circular polarization.
REFERENCES:
patent: 4242685 (1980-12-01), Sanford
patent: 4260988 (1981-04-01), Yanagisawa et al.
patent: 4347517 (1982-08-01), Kaloi
patent: 4605933 (1986-08-01), Butscher
patent: 4791423 (1988-12-01), Yokoyama et al.
patent: 4827266 (1989-05-01), Sato et al.
patent: 4835539 (1989-05-01), Paschen
Patin Robert J.
Raghavan Krishnan K.
Trese Brennan J.
Wong Mon N.
Denson-Low Wanda K.
Hughes Aircraft Company
Le Hoang-anh
Mitchell Steven M.
Westerlund Robert A.
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