for2G3GLTEWiMAXApplications创新.PDFVIP

Progress In Electromagnetics Research C, Vol. 73, 127–136, 2017 A Broadband Dual-Polarized Magneto-Electric Dipole Antenna for 2G/3G/LTE/WiMAX Applications * Zuming Li, Yufa Sun , Ming Yang, Zhifeng Wu, and Peiquan Tang Abstract—A novel broadband dual-polarized magneto-electric (ME) dipole antenna is proposed for 2G/3G/LTE/WiMAX applications. The proposed antenna has stair-shaped feeding strips to impart a wide impedance bandwidth to it and a rectangular box-shaped reflector to enhance its stability in radiation patterns and high gain over the operating frequencies. The measured results show that a common impedance bandwidth is 80% with standing-wave ratio (SWR) ≤ 1.5 from 1.68 to 3.92 GHz, and port-to-port isolation larger than 25 dB within the bandwidth. The measured antenna gains vary from 9.2 to 12 dBi and from 9.2 to 11.8 dBi for port 1 and port 2, respectively. The antenna has nearly symmetrical radiation patterns with low back-lobe radiation both in horizontal and vertical planes, and broadside radiation patterns with narrow beam can also be obtained. 1. INTRODUCTION With the great development of modern mobile communication systems in China, there is an ever- growing demand for wideband antennas, which meet the expansion of services bands and number of mobile users. Over the last few years, dual-polarized antennas have been widely used in base stations because they can provide polarization diversity to reduce side effects of multipath fading and also to increase channel capacity [1]. Meanwhile, wide bandwidth, high isolation and low cross-polarization electrical characteristics with a compact size are the scabrous problems for the dual-po