曲率对有限曲面狭缝阵列传输特性的影响

Influence of curvature on transmission properties of finite curved slot arrays

扩展互导纳法用于研究有限曲面狭缝阵列的传输特性,分析了一维弯曲效应以及单元列数、曲率等因素对磁流分布、散射方向图及频率响应曲线的影响.结果表明,曲面张角是衡量弯曲效应的主要参数.当曲面张角较大时(120°以上),弯曲效应显著,单元磁流分布剧烈起伏,散射方向图波束展宽且副瓣电平升高,谐振频率、传输带宽及功率透射系数等频率响应特性均发生较大变化.当曲面张角较小时(60°以下),仅边缘附近的单元磁流分布受到曲率影响,散射方向图与传输特性均接近于有限平面阵列,表明此时可近似忽略弯曲效应.

Transmission properties of finite curved slot arrays were investigated based on an extension of mutual admittance approach. One-dimensional curvature effects were analyzed,with the influence of column number and flare angle on magnetic current distribution,scattering patterns and frequency response curves. Results show that the curvature effect depends on the flare angle. When the flare angle is large （above 120°）,strong curvature effect leads to violent fluctuation of magnetic current distribution,wide beamwidth and high side lobes,and considerable changes also occur in frequency-response characteristics,including resonant frequency,transmission bandwidth and transmission coefficient. When the flare angle is small enough,generally below 60°,only the magnetic current distributions of marginal elements would get influenced,consequently the scattering patterns and transmission characteristics are similar to those of finite planar arrays. The curvature effect may became very weak and be ignored on this condition.