ARRAY ANTENNA EQUIPPED WITH SLOT RADIATOR OFFSET BY INCLINATION TO ELIMINATE GRATING LOBE

摘要

PURPOSE: To actualize an easy-to-assemble microwave structure by arranging output ports of respective radiation elements on the center line of an array and respective input ports off the center line, and then guaranteeing the identity with the phases of electromagnetic waves radiated from respective slots to eliminate a grating lobe. ;CONSTITUTION: Slots 40 are provided as radiators in a 1st wide wall 28 of a rectangular cross-section waveguide having two opposite wide walls 28 and 30 extending in an electromagnetic wave direction and two opposite side walls 32 and 34. The 1st wide wall 28 of the waveguide provided with the slots 40 is formed thickly and the respective radiation elements composed of the slots 40 are equipped with input ports 48 as slot openings of the internal surface of the waveguide and output ports 50 as slot openings of the external surface of the waveguide. The output ports 50 of the respective arrays are arranged on the center lines of the arrays and the input ports 48, on the other hand, are arranged off the center lines of the arrays. Each input port 48 is coupled with magnetic field components of an electromagnetic wave so that it is in phase with electromagnetic waves radiated from the slots 40.;COPYRIGHT: (C)1996,JPO