COMBINED ANTENNA

PROBLEM TO BE SOLVED: To provide a combined antenna sharing polarization and frequencies that does not cause a feed line to an upper antenna to interfere with a lower one, has small coupling between both the antennas, and dispenses with a connection line to an array element. SOLUTION: The upper antenna is set to be a waveguide slot antenna 1 having a slot on a wall surface, power is fed from a lower portion by a power feed waveguide, other waveguides allow their wide wall surfaces to be along each of both wide wall surfaces by aligning directions of tube axes so that the power feed waveguide 6 is sandwiched from both the wide wall surfaces, and slots that are long in the direction of the tube axis are provided at a plurality of locations on the wide outer wall surfaces of both the sandwiched waveguides to form a horizontal polarization omni-waveguide slot antenna. As the other configuration, narrow wall surfaces of other waveguides are subjected to face junction to one narrow wall surface of the power feed waveguide, slots that are long in the direction of the tube axis are formed on both the wide wall surfaces, thus forming the horizontal polarization omni-waveguide slot antenna. COPYRIGHT: (C)2007,JPO&INPIT