宽带宽角圆极化微带贴片天线设计

Design of broad-band and wide-angle circularly polarized microstrip patch antennas

提出一种新的宽带宽角圆极化微带天线设计方法 ,在利用 L探针进行近耦合馈电的基础上 ,通过薄介质基片加载 ,使贴片天线的阻抗带宽 ( VSWR≤ 2 )和宽角轴比带宽 ( 4 5°圆锥空域内 AR≤ 3d B)达到 2 0 %以上 ,同时保持了微带天线的固有优点 :剖面低 (厚度小于 0 .1中心频率波长 )。利用该方法设计的试验天线的带宽达到2 1 % 。

A new method for the design of broad band and wide angle circularly polarized (BBWACP) microstrip patch antennas is presented. In this paper. Based on the proximity coupled feed by using L shaped probe, the bandwidth of voltage standing wave ratio (VSWR)2 and wide angle axial ratio (AR) 3dB (in the 45° conic airspace) can be more than 20% by loading thin substrates, and the inherent merit of the microstrip antennas low section is retained. The measured results show that the of bandwidth wide angle axial ratio 3dB and voltage standing wave ratio 2 is 21%. So this design technique is correct and practical.