Circularly polarized antenna with resonant aperture in ground plane and probe feed
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United States of America Patent
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-
Jun 18, 1991
Grant Date -
N/A
app pub date -
Feb 21, 1990
filing date -
Feb 24, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cavity-backed dual-slot antenna element for circular polarization having a single probe extending from the end of the feed line for the element and arranged to couple energy into the resonant slots. The probe lies in the plane of the feed line and has the form of an open circle having a circumference of approximately one wavelength at the operative frequency. The probe is constrained to lie within the boundary of the resonant slots as projected onto the plane of the feed line. The arrangement produces a circular polarization having a greater axial-ratio bandwidth than that of conventional antennas using two orthogonal probes or using a single probe feeding a resonant patch. An antenna comprising a flat array of the elements is suitable for use in DBS (Direct Broadcast by Satellite) TV reception. However, the probe itself is not limited to use in slot antennas and it has applications in other antennas or couplers for circular polarization.
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