基于SIW的宽角度波束扫描CPW-CTS天线阵设计

本文基于基片集成波导(substrate integrated waveguide,SIW)提出了一种具有宽扫描角度的连续横向枝节(continuous transverse stub,CTS)频扫天线阵.沿纵向周期排列在共面波导馈线(coplanar waveguide,CPW)上的SIW结构CTS阵列向空间辐射电磁波.提出一种新型宽带CPW慢波结构作为天线阵的馈线,用以增大相邻天线单元之间的相位差,在8.6～13.7 GHz频带内,相位变化范围在89.3°～-83.3°,从而使天线阵主波束随频率实现大范围扫描.为了减少天线阵的后向辐射,在其背面1/4波长处加反射板.设计了一个4元SIW结构CPW CTS天线阵,利用全波仿真软件HFSS进行了分析.结果表明,在8.6～14 GHz频带内天线阵反射系数小于-10 dB,随频率增大实现E面-40°～56°的扫描,在各方向上的最大增益在9.8～12.3 dBi.

Design of abeam scanning CPW-CTS array based on SIW with broad angle range

This paper presents a broadband continuous transverse stub (CTS) antenna array with wide scanning range based on substrate integrated waveguide (SIW).The SIW CTSs radiators are periodically arranged on the coplanar waveguide (CPW).A novel broadband CPW slow wave structure is proposed as the feedline to increase the phase difference of the adjacent antenna elements.Depending the phase variation from 89.3° to-83.3° within the frequency range of 8.6～13.7 GHz,a wide beam steering range depending on frequency is achieved.A reflector is located at one fourth wavelength away from the antenna array to reduce the backward radiation.A 4 element CPW CTS antenna array based on SIW is designed and simulated using the HFSS full wave analysis software.The simulated results show that the frequency range of the reflection coefficient less than-10 dB is 8.6～14 GHz.The main beam of the antenna is scanned from-40° to 56° in E plane with the frequency increasing.At every main radiation direction,the gain varies within the range of 9.8 ～ 12.3 dBi.