一种新型单层宽带微带反射阵天线设计

Design and Performance of a New Single-Layer Broadband Reflectarray

针对微带反射阵天线带宽窄的问题,提出了一种新型线极化双谐振宽带"蝴蝶"形单元结构,详细描述了单元结构设计步骤,研究了不同基板以及不同结构参数对单元相位曲线的相移范围、平滑度以及谐振点位置的影响。仿真测试表明,该单元结构能够在5.5-7GHz带宽内具有良好的相位特性曲线。对36个"蝴蝶"形单元组件测试表明,其在20%带宽内辐射效率达到40%以上,最大辐射方向上交叉极化电平小于-30dB。此外,"蝴蝶"形单元结构类似于"十"字形单元结构,有利于进一步扩展实现多频带、多波束反射阵天线设计。

In this paper. A new linear polarized broadband double resonance ＇butterfly＇ element was proposed to solve the problem of narrow bandwidth of reflect array antenna. The steps of the element design was detailed described, and analyzed the influences of different substrates and configuration parameters on its phase characteristics of phase-shift range, smoothness and resonant points. The simulation tests showed that the element displayed good phase shift curves within 5.5- 7GHz bandwidth. According to our test, an array consists of 36 butterfly elements was able to provide above 40% radiation efficienty within 20% bandwidth and the cross-polarization was less than -30dB in largest radiation direction. In addition, similar to crossed dipoles, the ＇butterfly ＇ structure provided tremendous benefits for further achievement of multi-band and multi-beam reflect array antenna.