Coplanar patch antenna

Details Coplanar patch antenna Coplanar patch antenna

1988-12-16

1989-10-10

Carroll, J.

Communications: radio wave antennas

Antennas

Microstrip

343769, H01Q 138

Patent

active

048735299

ABSTRACT:
A coplanar patch antenna is formed, e.g as a printed circuit, on a dielectric support (1) by a metal patch (2) spaced from a coplanar ground plane (3) by a peripheral slot (4), and in the improvement is series fed by means of a slot line (5). The slot (4) can be made resonant by having a periphery of one wavelength or an odd multiple thereof, and a second slot line (7) can be fed into the slot (4) at a distance of one or an odd multiple of a quarter wavelength from the slot line (5) to provide an independent feed. The arrangement presents a feedpoint impedance of about 50 ohms at the ports (6,8) instead of about 400 ohms in prior arrangements.
Balancing loads or 180 degree hybrid feeds to other quadrature ports (11,12) can be used to correct beam asymmetry due to the slot line feeders (5 and 7).

REFERENCES:
patent: 4063246 (1977-12-01), Greiser
"Coplanar Stripline Antenna," Microwave Journal, vol. 19, No. 10, Oct. 1976.

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