基于SICL馈电的新型双极化天线设计仿真

提出一种基于介质集成同轴线（SICL）馈电的新型双极化天线实现方案.设计扩展了双极化天线的阻抗带宽且实现了两个正交印刷电路基板的直接装配.馈电结构采用印刷电路技术实现.引入SICL到异面带状线的宽带巴伦，实现SICL到异面带状线的不平衡到平衡的转换.设计了一种从SICL到微带线的渐变式宽带阻抗匹配电路.在2.2~2.8 GHz频率范围内，仿真的极化端口隔离度大于20 dB，两个极化端口均获得宽角覆盖的方向图，主辐射方向的低交叉极化电平低于－20 dB，具有较高的辐射效率.所加工天线的测试结果与仿真结果接近，验证了设计方案的可行性. 

Design and Simulation on a New Dual-Polarized Antenna Fed by SICL

A novel scheme of dual-polarized antenna fed by the substrate integrated coaxial line (SICL) was proposed. The design can enlarge the impedance band of the dual-polarized antenna and realize the direct assembling of two orthogonal printed circuits. A SICL feeding structure based on multiple layer substrates was designed. For this SICL feeder, a wide band Balun from SICL to non-coplanar was introduced, which realized the transforming of un-balanced SICL port to balanced non-coplanar strip line. A wide band tapered impedance matching circuit from SICL to microstrip line was designed. Within the frequency range of 2.2 GHz to 2.8 GHz, the simulated isolation degree between two polarization ports is higher than 20 dB, the wide angle coverage pattern at each port is achieved, the cross polarization level at the boresight is lower than -20 dB, and the high radiation efficiency is realized. The measured result of the fabricated antenna is close to the simulation result, which verifies the feasibility of the scheme.