A BROADBAND TWO-LAYER BULTER MATRIX FOR MULTI-BEAM ANTENNAS IN 3G/4G WIRELESS COMMUNICATIONS
The design of a broadband double layer 4×4 butler matrix for multi-beam antennas in 3G/4G wireless commuications is presented in this paper,which can operate over wide frequency band.The design exploits the microstrip-slot technology to accomplish wideband-3dB slot coupled directional couplers and also uses a short transmission line to obtain broadband phase shifters.This designed beamforming network has a wide frequency band and does not use any crossovers,which are the main challenges in practical realizations of butler matrices.Results of the full electromagnetic simulations show that isolation characteristics less than-14dB and input reflection levels lower than-15.8dB are experimentally validated from 1GHz to 3GHz.Excellent amplitude and phase characteristics were obtained span 1.5GHz frequency band centered at 2GHz.All these characteristics reveal the design very attractive for multi-beam antenna in 3G/4G wireless commuications.
Bbutler matrix Slot coupled directional coupler Broadband phase shifter
Xia Li Baohua Sun Xiaoqiang He Yanlin Zou Jingli Guo
National Key Laboratory of Antennas and Microwave Technology,Xidian University of Electronic Engineering Deprement,Xian 710071,China
国际会议
杭州
英文
1163-1166
2012-10-30（万方平台首次上网日期，不代表论文的发表时间）