Multi-band microstrip antenna

Details Multi-band microstrip antenna Multi-band microstrip antenna

1992-10-09

1994-06-07

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Microstrip

343830, H01Q 138

Patent

active

053193784

ABSTRACT:
A microstrip antenna capable of dual-frequency operation. The antenna comprises a microstrip having a thin, rectangular metal strip that is supported above a conductive ground plane by two dielectric layers which are separated by an air gap or other lower dielectric constant material. Conducting side walls and a rear wall extend between the ground plane and the strip. The ground plane, the strip, the walls and an opening at the front cooperate to form a rectangular resonant cavity. In essence, the cavity is surrounded by conducting surfaces except for the front opening and a small opening in the ground plane that accommodates an antenna feed. The front opening of the cavity functions as an antenna aperture through which the antenna transmits and/or receives energy. The antenna feed is a coaxial transmission line that provides a means for coupling the antenna to an external circuit. The spaced dielectric layers and the air gap produces higher-order modes which causes dual frequencies.

REFERENCES:
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patent: 4907006 (1990-03-01), Nishikawa et al.
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