Dual frequency microstrip antenna

Communications: radio wave antennas – Antennas – Microstrip

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H01Q 0000

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active

047712910

ABSTRACT:
A single element patch microstrip antenna for dual frequency operation is disclosed. By placing shorting pins at appropriate locations in the patch, the ratio of two band frequencies can be varied from 3 to 1.8. By also introducing slots in the patch, the ratio can be reduced from 3 to less than 1.3. A second embodiment of the antenna uses a c-shaped slot to obtain an even smaller ratio of two band frequencies.

REFERENCES:
patent: Re29296 (1977-07-01), Krutsinger
patent: 4040060 (1977-08-01), Kaloi
patent: 4078237 (1978-03-01), Kaloi
patent: 4130822 (1978-12-01), Conroy
patent: 4191959 (1980-03-01), Kerr
patent: 4197545 (1980-04-01), Favaloro
patent: 4242685 (1980-12-01), Sanford
patent: 4367474 (1983-01-01), Schaubert
patent: 4379296 (1983-04-01), Farrar
patent: 4386357 (1983-05-01), Patten
patent: 4489328 (1984-12-01), Gears
Article by Boa F. Wang and Yuen T. Lo entitled "Microstrip Antennas for Dual Frequency Operation" appeared in IEEE Transactions on Antennas and Propagation dtd Sep. 1984.

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