具有谐波抑制功能的多极化微带天线阵设计

本文提出了一种基于切换馈电网络的极化可重构微带天线阵。阵列单元采用正方形辐射贴片，利用微带线缝隙耦合进行馈电，通过在馈电结构中心加载短路柱，可获得宽带性能的同时，有效抑制偶次谐波。综合采用串联组阵和并联组阵技术，优化设计了一款2×2的天线阵列，将阵列端口分别与微带分支线耦合器及微带混合环相连，最终实现了水平和垂直线极化，左旋和右旋圆极化四种模式的切换。实验结果表明，所提出的天线在ISM频段2.4~2.5 GHz频率范围内获得了良好的匹配和多极化特性。该天线阵设计简单、易于操作，可潜在应用于无线通信系统中天线极化分集的场合。

Design of Multi⁃Polarization Microstrip Antenna Array with Harmonic Suppression

This article proposes a polarization reconfigurable antenna array based on switching feeding network. The antenna element adopts a square radiation patch, which is fed by microstrip line slot coupling. By loading a short?circuit column in the center of the feeding structure, the broadband performance can be achieved while effectively suppressing the even harmonics. A 2×2 antenna array is optimized and designed by using a technique of series array and parallel array. Two ports of the array are connected to a microstrip branch?line coupler and a microstrip hybrid ring respectively, ultimately enabling the switching among four modes: horizontal and vertical linear polarization, left?handed and right?handed circular polarization. The experimental results show that the proposed antenna exhibits good matching characteristics and multi?polarization capabilities within the 2.4~2.5 GHz frequency range of the ISM band. With the simple structure and user?friendly operation, this antenna can be potentially applied to the occasion of antenna polarization diversity in wireless communication systems.