WAVEGUIDE SLOT ANTENNA

PROBLEM TO BE SOLVED: To allow waveguide wide-pipe-wall slot array antennas, which are arranged having narrow-pipe-wall surfaces in contact, to generate a horizontally polarized wave, a vertically polarized wave, a circularly polarized wave, and an obliquely polarized wave by setting the array of the waveguides to 1/2 of smaller as large as the wavelength and devising the positions of slots provided at wide pipe walls. SOLUTION: This antenna has waveguides 11 to 13, which each have plural slots A. The waveguides 11 to 13 are filled with dielectrics, and the distance of the slots A on the tube axis is set to λg'/2 and the horizontal distance is set to λ'/2. Element intervals are set equivalently to a half as long as the wavelength by the dielectrics. Here, the arrows crossing the slots A show current flowing on the wall surfaces.