Cavity antenna
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorGary R. Hoople
Life of this patent
Estimating the term…
Abstract
A cavity antenna having an aperture which may be mounted flush to the gro plane. A chamber positioned above a rectangular resonant cavity allows the antenna to achieve normal bandwidth and normal gain with a very thin cavity depth.
Claims10
In an antenna of the type having an input channel to receive electromagnetic energy transmitted by a coaxial cable and a cavity having an aperture to allow the radiation of said electromagnetic energy into free space wherein the improvement comprises:
- a. a chamber located at the top of said cavity and interposed between said input channel and said cavity and commuting interiorly therewith;
- b. a metallic probe positioned interior to said chamber, said chamber being dimensioned such that the reactive component of impedance due to the combined effects of said chamber and said probe is inductive in an amount to negate the susceptive component of admittance of said cavity;
- and
- c. said probe in electrical connection with said coaxial cable.
In an antenna of the type having an input channel to receive electromagnetic energy transmitted by a coaxial cable and a cavity having an aperture to allow radiation of said electromagnetic energy into free space, the improvement comprising:
- a. a chamber located at the top of said cavity and interposed between said input channel and said cavity communting interiorly therewith;
- b. a metallic probe positioned interior to said chamber and electrically connected with said coaxial cable;
- and
- c. a block of dielectric material surrounding said probe to insulate said probe electrically from said chamber and from said cavity, said block being so dimensioned as to fill the interior of said chamber.
Dependencies are inferred from the claim text.