ANTENNA

摘要

An omnidirectional vertically polarized antenna is configured with k (k = 3) units of monopole antennas disposed at even intervals upon the circumference of a given circle, and an omnidirectional horizontally polarized antenna is configured with first to mth omnidirectional antennas stacked in m (m = 2) layers in a first direction orthogonal to a reflective plate. The first to mth omnidirectional antennas are configured with n units of half-wavelength dipole antennas. When viewed from the direction on the opposite side of the first direction, the n (n = 3) units of half-wavelength dipole antennas configuring the first to mth omnidirectional antennas are each configured with arcuate conductors, and are disposed at even intervals upon the circumferences of m units of circles of different diameters. The first to mth omnidirectional antennas are stacked toward the first direction from the reflective plate. As a result, a dual polarized antenna is provided which uses omnidirectional antennas which use half-wavelength dipole antennas, thereby achieving omnidirectional directivity within the horizontal plane with less directivity deviation than in the prior art.