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US 4,229,745 AGranted
Edge slotted waveguide antenna array with selectable radiation direction
AssigneeInternational Telephone and Telegraph Corporation
InventorBradford E. Kruger
Life of this patent
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Abstract
An antenna array consists of one or more slotted-waveguide, linear subarrays. Slots for radiation are cut in both narrow walls of each such waveguides, and PIN diodes across the slots are selectably forward and backward biased to effectively open the slots along one waveguide narrow wall while the others are closed and, alternatively, vice verse.
Claims10
An antenna array comprising at least one slotted-waveguide having a first predetermined slot pattern in a first of its narrow walls and a second predetermined pattern of slots in its second narrow wall comprising:
- means comprising first and second sets of radio frequency diodes, said first set comprising at least one diode for each slot in said first slot pattern and said second set comprising at least one diode for each slot in said second slot pattern;
- and means for controlling said diodes alternatively into conduction and non-conduction by sets such that said slots in said first pattern are effectively alternatively closed and open while said slots of said other set are contemporaneously alternatively opened and closed, respectively, said diodes each being placed across a corresponding slot so as to provide substantially a radio frequency short-circuit during its conductive condition and substantially no effect on said slot in said non-conductive conditions.
Dependencies are inferred from the claim text.