Low Profile Orthogonal Polarized Omnidirectional Antenna Using Halo Antenna with Short Elements

This paper proposes a low-profile orthogonally polarized antenna. The proposed antenna is composed of a sleeve antenna as a vertically polarized element and a Halo antenna with parasitic elements as a horizontally polarized element. The short element is loaded on the Halo antenna and the two parasitic elements, so that both polarizations have an omnidirectional radiation pattern in the horizontal plane. As a result of the simulation, it is found that the relative bandwidth is 5.2%, and the antenna diameter and height are 0.14λ0 and 0.47λ0, respectively.