双极化高隔离度孔径耦合天线研究

The study of dual-polarized high isolation aperture coupled antenna

在分析孔径耦合天线工作原理的基础上提出了基于馈电网络谐振频率的设计理念.在没有辐射贴片时,馈电网络有两个谐振频率.天线谐振频率低于馈电网络谐振频率时,由于无法获得足够的耦合能量,天线Q值高,带宽窄,隔离度低;天线谐振频率位于两个谐振点之间时,两个端口之间的面电流分布较少,互耦小,能够获得高隔离度双极化天线.解决了孔径耦合天线的馈电网络中非谐振缝的量化问题,以及设计中的多参数调试难题,能够快速准确地设计出宽带高隔离度双极化天线.2.4 GHz天线仿真和实测结果吻合较好,隔离度大于35 dB.

The concept of micro-resonant is proposed to design dual-polarized aperture coupled antenna.Feed network has two resonance frequencies when there is no radiation patch.When the resonant frequency of the antenna is lower than that of the feed network, antenna has high Q value, narrow bandwidth and low isolation because of insufficient coupling energy;when the resonant frequency of the antenna is between two resonant points, the surface current distribution between the two ports is less, so the mutual coupling is small, and the dual polarization antenna with high isolation can be designed.This paper solves the quantization problem of non-resonant slot in feed network of aperture coupled antenna and the problem of multi-parameter tuning in design process, and can quickly and accurately design dual polarization antenna with broadband and high isolation.The antenna operating at 2.4 GHz is designed and tested.The experimental result well fits the simulation, the isolation is greater than 35 dB.