基于倒S形枝节的宽带圆极化天线设计

Design of broadband circularly polarized antenna based on inverted S-shaped branch

为满足无线通信日益增长的带宽需求,扩展圆极化微带天线阻抗带宽和轴比带宽的同时保持无线设备的小型化,本文基于微带缝隙天线提出了一种宽带圆极化微带天线的设计。该天线整体尺寸为30 mm×30 mm×1.6 mm,顶部结构为倒S形枝节,采用偏心侧馈的馈电方式,通过在微带线上加载矩形短截线改善天线的阻抗匹配,扩展了天线的阻抗带宽,在接地板上切角、挖槽扩展了天线的轴比带宽。测量结果表明,天线的-10 dB阻抗带宽为62.1%(5.14~9.81 GHz),3 dB轴比带宽为63.9%(4.43~8.59 GHz)。该天线具有小型、宽频带的特性,适用于5.8 GHz频段和WiFi-6E频段的无线通信系统中。

In order to meet the increasing bandwidth requirements of wireless communication,expand the impedance bandwidth and axial ratio bandwidth of circularly polarized microstrip antenna while maintaining the miniaturization of wireless equipment,this paper proposes a design of broadband circularly polarized microstrip antenna based on microstrip slot antenna.The overall size of the antenna is 30mm×30mm×1.6mm,the top structure is an inverted S-shaped branch,and the eccentric side feeding mode is adopted.The impedance matching of the antenna is improved by loading a stub on the microstrip line,which expands the impedance bandwidth of the antenna,and the axial ratio bandwidth of the antenna is expanded by chamfering and trenching the ground plate.The measured results show that the-10dB impedance bandwidth of the antenna is 62.1%(5.16~9.81GHz),and the 3dB axis specific bandwidth is 63.9%(4.43~8.59GHz).The antenna has the characteristics of small size and wide band,which is suitable for the wireless communication system in the 5.8GHz band and WiFi-6Eband.