Array antenna

摘要

Dielectric lenses ( 6 ) with an outer dimension of about 0.5 to 1.5 times a wavelength are arranged on front faces of respective slots ( 3 ) of a waveguide slot array antenna ( 1 ). The dielectric lenses ( 6 ) are formed in a panel structure where they have been connected integrally through a dielectric panel ( 7 ) so that they cover a front face of the antenna. Spherical waves radiated from the slots are converted into a flat wave by the dielectric lenses, and a composite wave of radiation waves from the respective slots becomes a flat wave which hardly includes ripples, so that an antenna gain is remarkably improved as compared with a case that dielectric lenses are not provided.