To suppress the occurrence of a vertically polarized wave component while suppressing the mass and manufacturing cost of an antenna.
In the slot antenna 100, the distance along the footprint portion between the parallel portion of a supporting portion 26 and one side of the H-face portion of a waveguide 12 opposing the parallel portion is adjusted such that the amplitude of the vertically polarized wave component of a first radio wave radiated from a slot becomes equal to the total of amplitude of a second radio wave radiated from the footprint portion. The distance along the H-face portion between the footprint portion of the supporting portion 26 and the E-face where the slot is provided is adjusted such that the phases of the second radio waves are equalized while having such a relation as the phases of the vertically polarized wave component of the first radio wave and the second radio wave are inverted. The supporting portion 26 supports the waveguide 12 such that no air gap exist between. A conductive substance may be inserted between the supporting portion 26 and the waveguide 12.
YOUNG JOHN
SUGANO MASAYUKI
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