L波段圆极化背射天线的设计  

Design of Circularly polarized Short Backfire Antenna at L-band

作　　者：杨春兰[1] 

机构地区：[1]西安电子科技大学天线与电磁散射国防科技重点实验室,西安710071

出　　处：《测控与通信》2013年第2期1-3,共3页

摘　　要：设计并仿真了中心频率为1．705GHz的圆极化背射天线，主要对背射天线的副反射器进行了改进。采用2个副反射器，其中第1副反射器由共轴圆锥面、圆锥台面以及圆形围边组成，使天线的增益、阻抗带宽、轴比带宽都有不同程度的改善。得到天线驻波比小于1．2的阻抗带宽为7％，轴比小于3的圆极化带宽为4．6％，中心频率最大增益达到14．8dBi。Design and analysis of a circularly polarized short backfire antenna with center frequency of 1.705 GHz is presented in this paper. Great improvement in sub-reflectors of the short backfire antenna is made. Two sub-reflectors are in use, the first one of which is consist of a conical surface, a frustoconical surface and a circular rim with the same axis, so that better performances are obtained in the gain, impedance bandwidth and axial ratio bandwidth. It is demonstrated that the unbalancefed cross-aperture-excited SBA can achieve an axial ratio （〈 3 dB） bandwidth of 4.6% with a voltage standing wave ratio （VSWR） bandwidth of 7% （VSWR〈 1.2） and a gain of 14.9 dBi at the center frequency.

关 键 词：背射天线 圆极化 新型副反射器 

分 类 号：TN822.8[电子电信—信息与通信工程]