Circularly polarized wave microstrip antenna and frequency adjusting method therefor

摘要

In a circularly polarized wave microstrip antenna 1, a ground conductor 3 and a radiation conductor 2 are provided respectively on one surface and the other surface of a dielectric substrate 4 for feeding electric power to a feeding point P eccentrically provided on the radiation conductor 2. The radiation conductor 2 is provided with at least one projection 21a through 21d for adjusting the axial ratio at a position of an angle of 45x(2N+1) DEG (N: Integer) with respect to a reference line passing through a center point O and the feeding point P on the periphery thereof, and is provided with at least one frequency adjusting projection 22a through 22d at a position of an angle of 90 N DEG (N: Integer) with respect to the reference line.