Design of broadband dual-polarized antenna with integrated Marchand balun  

作　　者：Hao Honggang He Yong Ren Yi Liu Yanhui 

机构地区：[1]College of Electroning Engineering, Chongqing University of Posts and Telecommunications [2]School of Physics and Mechanical and Electrical Engineering, Xiamen University

出　　处：《The Journal of China Universities of Posts and Telecommunications》2015年第3期118-124,共7页中国邮电高校学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (61301032)

摘　　要：A design of broadband dual-polarized antenna with low cross polarization and high isolation was presented. The antenna is composed of a cross dipole, a folded ground, two feeding networks, and a reflector. The impedance bandwidth was enhanced by utilizing the mutual coupling between the two dipoles. A kind of meandering folded Marchand balun was skillfully integrated on the support column of the antenna to excite the dipole differentially, which can deliver both balanced （within 0.5 dB） power splitting and consistent （±5°） phase shifting from 1.71 GHz to 2.17 GHz. The standing wave ratios （SWRs） of each port are less than 1.5. By using this feeding network, the antenna has good performance in isolation （〉 45 dB） and cross polarization （〉 30 dB） over the entire operating frequency band. Moreover, the gain （-8.6 dB） of the proposed antenna is stable with frequency and the antenna structure is very firm due to the support column. The proposed antenna can be easily formed an array for digital cellular system （DCS）, personal communications service （PCS） and 3rd generation （3G） applications.A design of broadband dual-polarized antenna with low cross polarization and high isolation was presented. The antenna is composed of a cross dipole, a folded ground, two feeding networks, and a reflector. The impedance bandwidth was enhanced by utilizing the mutual coupling between the two dipoles. A kind of meandering folded Marchand balun was skillfully integrated on the support column of the antenna to excite the dipole differentially, which can deliver both balanced （within 0.5 dB） power splitting and consistent （±5°） phase shifting from 1.71 GHz to 2.17 GHz. The standing wave ratios （SWRs） of each port are less than 1.5. By using this feeding network, the antenna has good performance in isolation （〉 45 dB） and cross polarization （〉 30 dB） over the entire operating frequency band. Moreover, the gain （-8.6 dB） of the proposed antenna is stable with frequency and the antenna structure is very firm due to the support column. The proposed antenna can be easily formed an array for digital cellular system （DCS）, personal communications service （PCS） and 3rd generation （3G） applications.

关 键 词：Dual-polarized antenna cross dipole BALUN high isolation low cross polarization 

分 类 号：TN821.1[电子电信—信息与通信工程]