Multi-mode Luneberg lens antenna
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorKazumasa Doi
Life of this patent
Estimating the term…
Abstract
An antenna system having a multiple of antenna feeds to drive a microwave ns, composed primarily of a Luneberg lens and a metallic ground plane upon which are mounted three antenna feeds and a shorted stub (or four bent-stub coaxial feeds). The antenna system uses a common aperture to provide antenna performance for the three separate feeds, conserving space that would normally be required for three separate high gain antennas.
Claims15
A multi-mode microwave lens antenna system using a common aperture for use in transmitting and receiving microwave radiation substantially in the direction of the antenna roll axis, comprising:
- (a) a metallic ground plane having its center on the antenna roll axis with said roll axis being normal thereto;
- (b) a microwave lens mounted with its primary axis along the antenna roll axis with its focal point close to said ground plane;
- (c) a plurality of separate antenna feeds mounted about the center of said ground plane and said antenna roll axis;
- (d) said plurality of separate antenna feeds including at least two bent-stub coaxial feeds;
- (e) said bent-stub coaxial feeds having the ends thereof bent at an angle of 90 degrees with the bent ends being parallel to said ground plane at a selected distance in wavelength above said ground plane;
- the length of said bent ends being a desired dimension in wavelength;
- (f) said bent-stub coaxial feeds being oriented such that the bent ends thereof point at the antenna roll axis;
- (g) the orientation and position of said antenna feeds being operable to direct both horizontally-polarized and vertically-polarized antenna radiation through said microwave lens in the general direction of said antenna roll axis;
- (h) said microwave lens being operable to focus microwave transmissions to and from said antenna feeds to provide antenna performance with high gain and narrow bandwidth.
Dependencies are inferred from the claim text.