Broadband omnidirectional antenna for GSM900, GSM1800, 3G, 4G and Wi-Fi applications

In this paper, a broadband omnidirectional antenna, consisting of three tapered monopoles is presented. The antenna has |S₁₁| <; -10dB from 880MHz to 2.52GHz. The gain of the antenna is greater than 2dBi over the entire bandwidth. The measured H-plane radiation pattern is omnidirectional with less than 8dB variation over the entire bandwidth. The antenna covers GSM900, GSM1800, 3G, 4G and Wi-Fi bands.