采用立绒织造方式，以银纤维纱线作为导电结构单元材料，制备了基于U型立绒单元的立体周期结构频率选择纺织品。与具有U型底部长度同样尺寸的平面偶极子周期结构织物相比，U型立绒在偶极子两个端点沿Z轴向空间延伸。U型立绒立体周期结构织物在2~18 GHz内具有双频点谐振效应；谐振频率随着U型底部连通长度增加向低频移动，在同样的底部长度下，U型个数不影响谐振频率；银纤维构成的结构单元织物比不锈钢纤维纱线具有更加尖锐的谐振峰。进一步实现了基于银纤维纱线的、簇集U型立绒构成的十字体结构单元频率选择织物，表明立体周期结构织物具有丰富的灵活可设计性。
This paper has prepared a three-dimensional periodic structure frequency selective fabric (3D FSF) based on U velvet by velvet weaving method, with the silver yarns as the conductive material. Compared with the planar dipole periodic structure with the same U velvet bottom length size, the U velvet of the 3D FSF is extended in the two ends of the dipole along the Z direction and has double frequency resonance in the 2~18 GHz. With the increase of the U velvet bottom length, the resonant frequency moves to the lower frequency. The number of U connectings does not affect the resonant frequency with the same bottom length. The resonance peak of the sample with silver fiber as the conductive material is sharper than that of the sample with stainless steel fiber as conductive material. For further study, a cross-shaped 3D FSF made of clustered U velvet unit is proposed. It is demonstrated that the design and control of the 3D FSF is very flexible.
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