一种低剖面圆极化高增益微带天线设计

A Novel Design of Low Profile Circularly Polarized Antenna with High Gain Characteristics

设计了一种低剖面、宽频带、高增益圆极化天线。通过用一个电臂将辐射贴片与地板连接起来,能够获得11.8d Bi的增益。为了提高阻抗与轴比带宽,90°宽带移相网络用于天线的馈电网络。环状辐射贴片可以进一步提高天线的轴比带宽。实测驻波小于2的相对带宽在中心频率2.1GHz时有23.3%,从1.87GHz到2.36GHz。实测3d B轴比带宽为24.3%,从1.84GHz到2.35GHz,和仿真结果吻合的很好。

A novel design of low profile circularly polarized antenna with performances of high gain and broad bandwidths is presented in this paper.Through the method of connecting the radiating patch to the ground plane by the metal wall, the peak gain of the antenna can be achieved as high as 11.8d Bi.Furthermore, In order to improve the axial ratio(AR) and impedance bandwidths, broadband 90° phase-shifter is introduced as feeding network.Annular-ring structure acts as radiating patch instead of circular patch can further improve the AR bandwidths.The measured results show that the antenna possess an impedance(VSWR≤2) bandwidths of 23.3% ranging from 1.87 GHz to 2.36 GHz, and right-handed circular polarized(RHCP) axial ratio(AR≤3d B) bandwidths of 24.3% ranging from 1.84 GHz to 2.35 GHz relative to the center frequency of 2.1GHz, which agree well with simulated results.