双频双圆极化共面波导馈电缝隙天线

一种双频双圆极化共面波导馈电缝隙天线

内容简介：一种新型加载两个开口环形接地导带的双频共面波导（CPW）馈电缝隙天线，被提出来实现双旋向圆极化辐射。从天线信号带伸入槽隙的水平矩形调谐短截线用于改善频带内的阻抗和轴比。对天线进行仿真和实物测量。实验结果表明，该天线的10 dB 回波损耗阻抗带宽分别是，在1.55 GHz 频段为27.69％（1.4~1.85 GHz），在2.55 GHz频段为26.17％（2.075~2.7 GHz）。在1.55 GHz的频段和2.55 GHz频段所测量的3 dB轴比带宽分别是20.51％（1.4~1.72 GHz）和13.44％（2.36~2.7 GHz）。其辐射极化方向分别是低频段右旋圆极化和高频段左旋圆极化，天线在两频段内的峰值增益分别是3.69 dB和3.81 dB。实物测试结果与仿真结果基本吻合。

Abstract：A novel dual-frequency coplanar waveguide (CPW)-fed slot antenna with two opening annular grounded strips is proposed for dual-sense circularly polarized radiation. A rectangular tuning stub protruded into the slot from the signal strip of the antenna is used to obtain good impedance matching and axial-ratio over the whole frequency band. The antenna has been investigated numerically and experimentally. Experimental results show that the measured 10-dB return loss impedance bandwidth of the antenna are, respectively, at 1.55 GHz frequencies of 27.69% (1.4-1.85 GHz) and at 2.55 GHz frequencies of 26.17% (2.075-2.7 GHz). The measured 3-dB AR bandwidth for the 1.55 GHz band and 2.55 GHz band can be up to 20.51% (1.4-1.72 GHz) and 13.44% (2.36-2.7 GHz), respectively. The polarization direction of the radiation is RHCP at lower band and LHCP at higher band, the peak gain of the antenna in two frequency bands are 3.69 dB and 3.81dB, respectively. The measured results are consistent with the simulated results.

作者：赵文奇, 韦高,

关键词：圆极化, 缝隙天线, 双频, CPW, 双旋向,