多频段宽带圆极化天线的研究与设计

Research and Design of Multiband Wideband Circular Polarization Antenna

本文设计了一种工作在WLAN的多频段宽带圆极化天线.天线由3层贴片堆叠而成,通过切去每层贴片右对角线的切角而产生左旋圆极化.为了提高天线的阻抗带宽和轴比带宽,将天线的下层贴片和中层贴片的中心都蚀刻一个方形缝隙.此外,为了改善天线中层贴片的阻抗匹配,在中层贴片蚀刻一个矩形窄缝.仿真结果表明,天线工作频段的中心频率为2.05GHz,2.45GHz和3.48GHz,相应的相对带宽分别为3.8%,4.5%和5.1%.相较没有蚀刻方形缝隙的堆叠型圆极化天线,3个工作频段相应的相对带宽分别提高了4.2倍,2.8倍和1.8倍.

In this paper, a novel circular polarization antenna operating in WLAN is presented. The antenna is composed of three stacked patches. Circular polarization is generated by cutting off the right diagonal of each patch. In order to improve the impedance bandwidth and the axial ratio bandwidth of the antenna, a rectangular gap is cut in the bottom and middle patch. Moreover, in order to improve impedance matching, another rectangular gap is etched in the middle patch. The simulated results show that the relative bandwidth of the antenna on 2.05 GHz, 2.45 GHz and 3.48 GHz is 3.8%,4.5% and 5.1% respectively. Compared with the reference antenna without square slots, the relative bandwidth is increasesd by 4.2 times at 2.05 GHz, 2.8 times at 2.45 GHz and 1.8 times at 3.48 GHz.