Patch antenna

Details Patch antenna Patch antenna

1987-12-17

1989-04-11

Sikes, William L.

Communications: radio wave antennas

Antennas

Microstrip

343745, 343750, H01Q 0000

Patent

active

048210412

ABSTRACT:
A microwave patch antenna, comprising a substrate of high dielectric constant, an aperture in the substrate, a patch conductor positioned on one side of the conductor and juxtaposed over said aperture, a ground plane on the other side of the substrate and having an aperture juxtaposed to at least a substantial proportion of the patch conductor. A conductive cavity is RF-coupled to the ground plane at the aperture, the cavity extending away from the substrate and being short-circuited at its end remote therefrom; in the operating frequency range of the antenna, the cavity forms a waveguide constituting an inductance. The length of the cavity may be adjustable to tune the antenna, the length of the cavity being sufficient for the resonant frequency of the antenna to decrease with increasing cavity length.

REFERENCES:
patent: 4047181 (1977-09-01), Hoople

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