一种寄生阵列宽带圆极化天线的设计

Design of a Broadband Circularly Polarized Antenna with Parasitic Array

该文设计了一款C波段单馈寄生阵列的宽带圆极化天线。此天线采用紧邻的双层F4B介质基板,通过在方形驱动贴片上开槽及采用寄生阵列的设计实现了圆极化。对天线结构的设计步骤进行说明,研究了各结构对天线阻抗带宽和轴比带宽的影响,并研究了寄生贴片切角长度和驱动贴片上的缝隙宽度对天线轴比和带宽的影响。对天线的圆极化方向图进行了仿真。仿真结果表明,在5.5 GHz时实现了右旋圆极化,最大增益为8.1 dBi。加工并测试了宽带圆极化天线,测试结果与仿真结果基本相符,天线实测的阻抗带宽为1.3 GHz,轴比带宽为1.26 GHz。设计的叠层天线具有结构紧凑,装配简单和轴比带宽大的优点。

A broadband circularly polarized antenna with C-band single-fed parasitic array is designed in this paper.The antenna adopts the adjacent double-layer F4B dielectric substrate,and the circular polarization is realized by slotting on the square drive patch and adopting the design of parasitic array.The design steps of the antenna structure are described,and the effects of each structure on the antenna impedance bandwidth and axial ratio bandwidth are studied.The effects of the parasitic patch tangent length and the slot width in the drive patch on the axial ratio and bandwidth of the antenna are also investigated.The circular polarization pattern of the antenna is simulated.The simulated results show that the antenna has a right-hand circular polarization is achieved at 5.5 GHz with a maximum gain of 8.1 dBi.The broadband circularly polarized antenna was fabricated and tested,and the test results were basically consistent with the simulation results.The measured impedance bandwidth of the antenna was 1.3 GHz,and the axial ratio bandwidth was 1.26 GHz.The designed stacked antenna has the advantages of compact structure,simple assembly and large axial ratio bandwidth.