WAVEGUIDE SLOT ANTENNA

PROBLEM TO BE SOLVED: To permit a radiation characteristic to be the one with high precision by means of simple configuration by providing a waveguide where plural bending parts are successively provided in a waveform shape and plural slots which are formed between the bending parts of the waveguide in a tube axial direction. SOLUTION: In the bending parts 11 of the square waveguide 10 where the slots 12 are arranged, the bending angle is set so as to permit the slots 12 to be almost orthogonal in the tube axial direction of the square waveguide 10 in accordance with the power characteristic of radio wave to be radiated. In the bending parts 11 and 11, the inclination angle is set so as to permit the tube path of the intermediate part of them to be almost orthogonal in the tube axial direction of the square waveguide 10 and the respective polarized surfaces of the slots 12 are set in a state where the surfaces are almost orthogonal in the tube axial direction. Thus, the polarized surfaces of the plural slots 12 are made to be almost orthogonal against the tube axial direction of the square waveguide so as to be almost uniformly set. The polarized surface is made to be almost orthogonal in the tube axial direction so as to be set almost uniformly so that intersecting polarization at the time of radiating radio wave is reduced and the radiation characteristic with a high efficiency is realized.