A High Gain Omnidirectional COCO Antenna Array

Abstract

This paper presents a high gain wideband omnidirectional COCO antenna array. The antenna array operates at 1500MHz-2000MHz and can be used for mobile communication. The planar micro-strip array antenna is composed of seventeen trapezoidal micro-strip patch antennas with different sizes. By loading a matching resistance, the antenna can achieve an impedance bandwidth of 28.5% for VSWR<=2, and it has good horizontal omnidirectional radiation characteristics. The out-of-roundness is less than 0.3 dB and the highest gain is 9dB.