一种新型宽带双极化微带贴片天线的设计

摘要：运用口径耦合理论、腔模理论、反相馈电技术和多层贴片结构设计出一种新型的P波段（中心频率为0．75GHz）宽带双极化微带贴片天线。天线的两个极化端口采用共面馈电；馈电网络设计中采用短路耦合线实现反相馈电。仿真结果表明该天线两个极化端口实际增益均达到8．5dB，水平极化端口在0．64-0．85GHz频率范围内驻波比小于2，相对带宽为28％；垂直极化端口在0．68-0．85GHz频率范围内驻波比小于2，相对带宽为22．6％，两端口隔离度高于53dB。

Design of Novel Broadband Dual-Polarized Microstrip Patch Antenna

A design of novel dual-polarized microstrip patch antenna with wide bandwidth for P-band （the center frequency is 0.75 GHz） application is presented in this paper. Aperture-coupled theory, cavity model theory, anti-phase feeding technique and stacked patch antenna architecture are adopted in the antenna design in order to increase the bandwidth. Both of the polarization ports are fed with a coplanar microstrip line. Short-circuited coupled-line technique is considered in design of the anti-phase feeding network, which leads to lower cross polarization. The simulated results show that the realized gains of both the polarization ports reach 8.5 dB. The relative impedance bandwidth is 28% from 0.64 GHz to 0.85 GHz for horizontal po- larized port and 22.6% from 0.68GHz to 0.85 GHz for vertical polarized port when VSWR is less than 2, while the isolation between the dual polarization ports is better than 53 dB.