CPW馈电的宽带双圆极化天线设计

CPW-Fed Broadband Dual Circularly Polarized Antenna

设计了一款新型的宽带双圆极化贴片天线。天线由两个正交的T型共面波导(CPW)馈电,同时在贴片上开矩形槽,在矩形槽的左下角引入爪形枝节以提高端口隔离度。这种设计不仅具有很宽的阻抗带宽和轴比带宽,而且结构简单易于生产。测试结果表明,此天线的相对阻抗带宽为75%(1.8-4 GHz),3 d B轴比带宽为40%(2.0-3.0 GHz),端口隔离度在轴比带宽范围内小于-15 d B。天线能够满足WLAN(2.4-2.484 GHz)和Wi-MAX(2.5-2.69 GHz)的通信要求。

A novel broadband dual circularly polarized antenna is proposed in this letter.The antenna consists of two T-shaped CPW feed lines in orthogonal direction.To further increase the isolation between the two ports, perturbed structure is etched at the lower left quarter of the rectangular slot.This design not only provides very wide impedance and axial ratio bandwidths, but also has features of low cost and ease in fabrication.The measured results show that-10 d B impedance bandwidth is 75%(1.8~4 GHz) and the 3-d B axial-ratio bandwidth is 40%(2.0~3.0 GHz).The isolation between the two ports are better than-15 d B in the whole axial-ratio bandwidth.The proposed antenna can meet the communication requirement of WLAN(2.4~2.484 GHz) and Wi-MAX(2.5~2.69 GHz).