Antennas
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United States of America Patent
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-
Nov 16, 2004
Grant Date -
May 22, 2003
app pub date -
Nov 20, 2002
filing date -
Nov 20, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A marine radar antenna has a single dielectric plate mounted in front of the waveguide polarization grid between two horn plates. A strip of dielectric material is secured to the upper and lower surfaces of the plate to form a forwardly and rearwardly facing step on each surface. The steps are located forwardly of the ends of the horn plates and are positioned to produce reflections substantially 180.degree. out of phase with extraneous energy within the antenna. The dielectric plate is supported by a foamed plastics material within an outer radome.
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