基于互补源的紧凑型圆极化倾斜波束天线

Theory of complementary source and its application to compact circularly polarized tilted beam antenna

本文提出一种结构紧凑且固有倾斜辐射波束的圆极化天线.通过使用一对正交的互补源,将在俯仰面的倾角方向上产生圆极化波.为了验证方法的可行性,该天线主要由扇形的单极子、短路钉和L型的接地板组成.短路钉一端连接单极子天线,另一端连接接地板的水平部分,从而形成一个环路辐射单元.研究结果表明:该天线的最大辐射增益在θ=60°,φ=90°的方向上,具有6. 2%左右的3 dB轴比工作带宽.同时,相较于现有的倾斜波束圆极化天线,它的结构更加紧凑,适用于小型化的设计需求.

In this research study,a compact circularly polarized antenna with a tilted beam is proposed on the basis of a pair of orthogonally oriented complementary dipoles.The proof-of-concept demonstrates that the proposed antenna mainly consists of a planar sectorial monopole antenna,shorting pin,and L-shaped ground plane.The shorting pin connects the monopole and the horizontal part of the ground plane to realize a loop antenna.Experimental results show that a maximum radiation gain occurs at the direction of θ=60°,φ=90°,and an axial ratio at values lower than 3 dB is approximately 6.2%.More importantly,by comparing the proposed antenna with existing circularly polarized tilted beam counterparts,it can be seen that the proposed one is more compact,which fulfills the requirement of miniaturization.