Novel Balun Structure for Dipole Antenna  

作　　者：Jin Kui Zhang Enze Yang Yang He Xiaoxiang Gu Changqing 

机构地区：[1]College of Electronic Information Engineering,Nanjing University of Aeronautics and Astronautics [2]Ministerial Key Laboratory of JGMT,Nanjing University of Science and Technology

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2017年第5期561-566,共6页南京航空航天大学学报（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities (No. 30920140122005);the Research Innovation Program for College Graduates of Jiangsu Province (No.CXLX11_ 0198)

摘　　要：A novel balun structure for dipole antenna,which is based on the current distribution on parallel microstrip lines and the emission cancellation characteristic of close equal and opposite currents,is proposed.The principle of the balun structure is first elaborated and verified.Then,a dipole antenna with resonance at 2.45 GHz is constructed using the balun and its radiation pattern is measured.The simulated and measured reflection coefficients(S_(11))of the antenna are in good agreement 2—3 GHz.The relative bandwidth with an S_(11) of below-10 dB is more than 25%.The antenna also shows a good radiation pattern at 2.45 GHz.The proposed structure can provide a new balun design method for dipole antennas.A novel balun structure for dipole antenna, which is based on the current distribution on parallel micros- trip lines and the emission cancellation characteristic of close equal and opposite currents, is proposed. The princi- ple of the balun structure is first elaborated and verified. Then, a dipole antenna with resonance at 2.45 GHz is constructed using the balun and its radiation pattern is measured. The simulated and measured reflection coeffi- cients （Sn） of the antenna are in good agreement 2--3 GHz. The relative bandwidth with an Sn of below -10 dB is more than 25 ~. The antenna also shows a good radiation pattern at 2.45 GHz. The proposed structure can pro- vide a new balun design method for dipole antennas.

关 键 词：coplanar balun dipole antenna WIDEBAND compact balun 

分 类 号：TN925[电子电信—通信与信息系统]