Tunable microstrip patch antenna and feed network therefor

Details Tunable microstrip patch antenna and feed network therefor Tunable microstrip patch antenna and feed network therefor

1997-04-22

1999-08-24

Font, Frank G.

Communications: radio wave antennas

Antennas

Microstrip

343701, H01Q 126

Patent

active

059430168

ABSTRACT:
A patch antenna is provided with one or more tuning strips spaced therefrom and RF switches to connect or block RF currents therebetween. When a conducting path for RF current is connected between the tuning strips and the patch, the tuning strips increase the effective length of the patch and lower the antenna's resonant frequency, thereby allowing the antenna to be frequency tuned electrically over a relatively broadband of frequencies. If the tuning strips are connected to the patch in other than a symmetrical pattern, the antenna pattern of the antenna can be changed. A feed network couples RF to the antenna and includes two hybrid couplers, one for providing the correct amplitude and phase of excitation at the feed probes, and the second for effectively dissipating reflected power due to antenna impedance mismatch.

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