一种新型交叉馈电宽带印制天线

A Novel Cross Feed Broadband Printed Antenna

设计了一种新型交叉馈电宽带印制天线,该天线对存在耦合的宽偶极子进行电容加载,构成宽频带容性辐射单元,使用平行宽边耦合双线对两个辐射单元进行交叉馈电,实现阻抗匹配调节和提高增益的作用。通过理论分析和HFSS软件仿真计算表明:该天线能够在厚度1mm、εr=2.6的介质板上实现53%的阻抗带宽(VSWR<2.0),并且频段内方向图主瓣不分裂,增益可达4.8dB i,相位中心不随工作频率变化而移动。该天线易于设计和加工,参数易于调整,有较强的实用性。

A novel cross-feed broadband printed antenna is presented in this paper. Wide dipole is capacitively-loaded to acquire a broadband antenna element. Two elements are cross-fed by parallel broadside coupled lines to actualize impedance match and get high gain. Theoretical analysis and simulation results with HFSS show that the antenna fabricated on the substrate with thickness of lmm and relative permittivity of 2.6 can achieve an impedance bandwidth of 53% for VSWR less than 2 and maximal gain of 4. 8dBi, with good far-field radiant characteristics and stable phase center. The antenna is easy to be designed and fabricated and it has a wide application.