A Wideband microstrip array antenna for PCS and IMT-2000 services

초록

A wideband microstrip antenna for PCS and IMT-2000 service is designed. To obtain the wideband characteristics of an antenna, we utilized the multi-layer structure composed of two foam material layers, parasitic element and aperture coupled feeding network. The bandwidth can be broadened by changing the size of parasitic element and the height of foam materials. In addition to that, the usage of metal layer at the distance of from feed-line reduces the back radiation. The bandwidth of a single antenna for VSWR less than 1.3 is about 550MHz. However, if this single antenna is extended to form an array antenna, the return loss characteristic deteriorates. To improve the return loss characteristic we placed the gap between the coupling slots The bandwidth of a designed 1×4 array antenna for VSWR less than 1.4 is about 560MHz. The gain of a designed array antenna is about 13dBi and the F/B ratio is about -20dB. By increasing the number of array element, a designed antenna can be used as a base station antenna for both PCS and IMT-2000 services.