Antenna
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United States of America Patent
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Apr 22, 2003
Grant Date -
N/A
app pub date -
Nov 29, 1999
filing date -
Dec 29, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dielectric-loaded antenna for circularly polarized radiation has a generally cylindrical solid dielectric body with a relative dielectric constant greater than 5, upon which body is plated a conductive sleeve encircling the body and a conductive end layer which, together with the body, form an open-ended cavity substantially filled with the ceramic material of the body. The electrical length of the cavity rim is a whole number of guide wavelengths corresponding to the antenna operating frequency less than 5 GHz. A rotating standing wave is excited around the cavity rim by a feeder structure including two helical conductor tracks on the cylindrical surface of the body which are coupled between the cavity rim and a coaxial feeder passing axially through the body.
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