Communications: radio wave antennas – Antennas – Microstrip
Patent
1987-09-30
1988-11-08
Sikes, William L.
Communications: radio wave antennas
Antennas
Microstrip
343830, H01Q 138
Patent
active
047836610
ABSTRACT:
A circularly polarized antenna including first and second multiple patch antenna structures dimensioned to operate at two distinct frequencies, each antenna structure consisting of four shorted patches, the patches of the first structure being spaced from a ground plane by dielectric material, the patches of the second structure being spaced from the patches of the first structure by dielectric material, the patches of the second structure each overlying a corresponding patch of the first structure and each having a dimension .lambda..sub.m.sup.(2) /4 which is less than the dimension .lambda..sub.m.sup.(1) /4 of the corresponding patch of the first structure, with feed means for each of the patches, the patches of both structures being disposed in the planes of the patches so that the radiating edges of the two patch structures form superimposed antenna structures.
REFERENCES:
patent: 4070676 (1978-01-01), Sanford
patent: 4089003 (1978-05-01), Conroy
Sanford et al., "Recent Developments in the Design of Conformal Microstrip Phased Arrays", IEEE Conf. on Maritine and Aeronautical Satellite Communications and Navigation, 7-9 Mar. 1978, IEEE Conf. Pub. No. 160, pp. 105-108.
Sikes William L.
STC PLC
Wimer Michael C.
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