一种宽带UHF印刷偶极子天线的设计  

Design of a Wideband UHF Printed Dipole Antenna

作　　者：王善进[1] 杨雷[1] 陈琼[1] 胡耀华[1] 

机构地区：[1]东莞理工学院电子工程学院,东莞523808

出　　处：《微波学报》2013年第2期30-34,共5页Journal of Microwaves

基　　金：广东省自然科学基金(S2011010000300)

摘　　要：设计制作了一种宽带UHF印刷偶极子天线。为了使天线在UHF的低频段获得宽带特性,采用了改进的Marchand巴伦馈电。该巴伦在传统的结构上,通过在接地板上开槽以改变耦合微带线与接地板之间的电容值,从而调整巴伦的奇偶模阻抗,以提高偶模阻抗与奇模阻抗的比值,实现带宽的拓展。仿真表明天线在530～790MHz范围内,回波损耗低于-10dB,相对带宽可达40%。加工制作了天线,实测结果与仿真数据吻合良好。这类天线在微波低频段具有特别的实用意义。A wideband UHF printed dipole antenna is designed, and the prototype of this design has been successfully implemented. The antenna is fed by a modified Marchand balun to achieve broadband operation in UHF band. Several Ushaped slots are cut in the ground plane of the conventional balun to change the capacitance between coupled line and the ground plane, which can achieve a high ratio of even mode to odd mode impedance and a broadband operation. The imped- ance bandwidth determined from a lOdB return loss is found to be about 40% , with the bandwidth 530MHz to 790MHz. The antenna has been fabricated, measured and simulated results are in close agreement. The antenna is particularly useful in the low microwave frequency band.

关 键 词：微带巴伦 印刷偶极子天线 宽带 超高频(UHF) 

分 类 号：TN821.4[电子电信—信息与通信工程]