Simulation Method for Halo Antenna with Parasitic Element for Bandwidth Enhancement

Base station antennas are an indispensable component for mobile communication. For low wind load, circular cylinder structure with small diameter is usually employed for base station antenna. However, omnidirectional pattern with horizontal polarization and wide operating bandwidth is difficult to excite by such a cylinder structure. This paper presents the simulation and design method of Halo antenna with parasitic element for ease of fabrication and bandwidth enhancement. The proposed structure is Halo antenna with inner parasitic element. For ease of fabrication, several dimensions are fixed for the ease of fabrication and maintaining the inner capacity. The proposed antenna in this paper achieves operating bandwidth from 876 MHz to 975 MHz (10.8 %) with |S11| under –10 dB. In addition, the omnidirectional pattern with horizontal polarization are confirmed in operating frequency band.