曲率对柱面频率选择表面传输特性的影响

Effect of Curvature on the Transmission Characteristics of Cylindrical Frequency Selective Surface

曲面频率选择表面(FSS)部件处于天线的非均匀照射下,容易造成传输特性对角度响应的不稳定。本文通过设计了一种柱面FSS结构,并利用时域有限差分法,研究了分别以圆环型、十字型和Y型单元构成柱面FSS结构下,曲率对其传射特性的影响。结果显示,随着曲率半径的减小,柱面FSS频点向低频漂移,透过率降低,其中以Y型单元的性质相对稳定。

When Frequency selective surface（FSS） is exposed to the uneven irradiation of antenna,the transmission characteristics is easy to be instable.In this paper,a kind of cylinder FSS structure is designed and the influence of curvature on transmission characterisitcs has been researched under the cylinder FSS strucutres composed of ring-type,cross-type and Y-type unit respectively by means of finite difference time domain（FDTD）.The results show that with the decrease of radius of curvature,the frequency point of cylinder FSS drifts to the low frequency point and the transmittance decreases;furthermore the Y-type unit shows the relatively stable characteristics.