High efficiency microstrip antennas

Details High efficiency microstrip antennas High efficiency microstrip antennas

1994-12-08

1997-01-28

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Microstrip

H01Q 1138

Patent

active

055981682

ABSTRACT:
The effectiveness of a microstrip conductor antenna, such as a patch antenna, is improved at any particular frequency by making the thickness of the conductor sufficiently small to reduce shielding and losses caused by the skin effect and make currents at the upper and lower surfaces couple with each other and make the conductor partially transparent to radiation. In one embodiment the thickness is between 0.5.delta. and 4.delta.. Preferably the thickness is between 1.delta. and 2.delta. where .delta. is equal to the distance at which current is reduced by 1/e., for example 1.5 to 3 micrometers at 2.5 gigahertz in copper. According to an embodiment, alternate layers of dielectrics and radiation transparent patches on a substrate enhance antenna operation.

REFERENCES:
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patent: 4218682 (1980-08-01), Yu
patent: 4329689 (1982-05-01), Yee
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patent: 5124713 (1992-06-01), Mayes et al.
patent: 5124733 (1992-06-01), Haneishi
Katechi et al, "A Bandwidth Enhancement Method for Microstrip Antennas," 1985, pp. 404-406.
Bahl et al, Microstrip Antennas, 1980, p. Appendix C.

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