A 5.8-GHz omnidirectional horizontal radiation pattern antenna for wireless communication system

Abstract

A new kind of planar antenna for wireless communication system is presented in this paper; the antenna is characterized with ominidirectional horizontal plane radiation pattern, compact structure and low profile. It can be used in UMTS or used as small indoor base station antenna. The simple structure of this antenna is based on the conventional small loop antenna. Four printed dipole antennas each with a microstrip via-hole balun feeding structure and two triangular mental plates are combined and fabricated on a substrate. The feeding line of the antenna is etched on the other side of it. Both simulated and measured results exhibit good performance of low un-roundness of horizontal plane omnidirectional radiation pattern.