Cavity-backed slot antenna resonating at two different frequencies

摘要

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.