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US 6,150,989 AGranted
Cavity-backed slot antenna resonating at two different frequencies
AssigneeSky Eye Railway Services International Inc.
InventorYvon C. Aubry
Life of this patent
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Abstract
A cavity-backed slot antenna constituted by a housing constructed of conductive material. The housing forms a cavity. An elongated primary slot of a given length is formed in one of the walls of the housing. A secondary slot of a given length is formed in an adjacent wall. Diodes are secured across the primary slot at a pre-determined location. An r.f. transmission line is electrically coupled to the conductive sheet across side edges of said primary slot for transmitting and receiving r.f. signals.
Claims11
A cavity-backed slot antenna comprising:
- (a) a conductive housing having one slot in each of two adjacent walls,
- (b) one of said slots being an elongated primary slot of a given length formed in one of said two adjacent walls,
- (c) the other of said slots being a secondary slot of a given length formed in the other of said two adjacent walls,
- (d) diodes secured across said primary slot at a pre-determined location;
- said diodes, during a transmission mode of said antenna, being conductive to short-circuit said primary slot to effectively reduce the length of said primary slot to effect resonance at the transmitting frequency while being ineffective to receiving frequencies and thereby resulting in a reduction of the length of said conductive housing, and
- (e) r.f. transmission means electrically coupled to said conductive housing across side edges of said primary slot for transmitting and receiving r.f. signals.
3 more elements
Dependencies are inferred from the claim text.