Communications: radio wave antennas – Antennas – Microstrip
Patent
1986-12-11
1988-08-23
Sikes, William L.
Communications: radio wave antennas
Antennas
Microstrip
343767, H01Q 138, H01Q 1308
Patent
active
047664401
ABSTRACT:
A microstrip antenna employing a rectangular radiating element having a Uaped slot oriented parallel to the length of the radiating element and employing a single feedline coplanar with the radiating element. The slotted radiating element has three resonances: a length resonance polarized parallel to the length of the element; a width resonance polarized parallel to the width of the element; and a slot resonance polarized parallel to the length of the element. By proper selection of the length and location of the slot, the frequency of the slot resonance can be placed such that a region of circular polarization occurs between the width resonance and the slot resonance. Alternatively, a region of circular polarization can be created between the length resonance and the width resonance since they are also polarized perpendicular to each other. Thus the U-slotted antenna provides either triple-frequency operation or dual-frequency operation in which one frequency is circularly polarized and the other frequency is elliptically polarized.
REFERENCES:
patent: 4074270 (1978-02-01), Kaloi
patent: 4130822 (1978-12-01), Conroy
patent: 4191959 (1980-03-01), Kerr
patent: 4259670 (1981-03-01), Schiavone
patent: 4356492 (1982-10-01), Kaloi
patent: 4364050 (1982-12-01), Lopez
patent: 4367474 (1983-01-01), Schaubert et al.
patent: 4410891 (1983-10-01), Schaubert et al.
Curry C. D. B.
Daubenspeck W. C.
Moss K. S.
Sikes William L.
The United States of America as represented by the Secretary of
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