一种双模宽波束平面天线及其相控阵应用

该文提出了一种双模宽波束平面天线单元，并基于此单元实现了具有大角度扫描特性的相控阵天线。该天线由两个平行的磁偶极子和一个电偶极子组成，其中磁偶极子是三边短路的微带贴片，电偶极子是带有扇形加载的金属条带。通过使用两个磁偶极子，工作带宽得到了有效拓展。天线10 dB阻抗带宽的测量值为5.3%（5.55~5.85 GHz），工作频带内E面的半功率波束宽度大于140°。对单元间距为0.23λ₀（λ₀为在自由空间中心频率对应的波长）的8单元线阵的扫描特性进行了研究。测试结果表明，该天线阵的主波束可以在增益3 dB波动范围内从-60°扫描到+60°，同时扫描的3 dB波束覆盖范围可以从-76°到+78°。天线及其阵列的仿真和实验结果符合得较好。

A Dual-Mode Widebeam Planar Antenna and Its Phased Array Applications

A novel dual-mode widebeam planar antenna is proposed to fulfill the requirements of wide-angle scanning phased array application. It consists of two parallel magnetic dipoles and one electric dipole. The magnetic dipole is a microstrip patch with three shorted edges and the electric dipole is a metal strip with fan-shaped loading. With the utilization of two magnetic dipoles, the bandwidth is enhanced compared to one magnetic dipole. The measured 10-dB impedance bandwidth is 5.3% (5.55-5.85GHz) and the 3 dB beamwidth in E-plane is more than 140° within the whole working band. An array composed of eight elements with 0.23 λ₀ spacing (λ₀ is the free space wavelength of central frequency) is also investigated. The main beam direction of the array can scan from -60° to 60° in E-plane with a gain fluctuation of less than 3 dB and the scanning 3 dB beam can cover a range from -76° to 78°. Good agreement between simulation and measurement is achieved.