通过先驱体法制备出十字形SiC纤维, 纤维外接圆直径为34μm左右, 纤维叶片长度为12μm左右, 宽度为8μm左右。使用同轴环方法测试了十字形SiC纤维的复介电常数和复磁导率, 测试表明纤维是介电损耗材料, 纤维的介电常数实部（ε′）、虚部（ε″）和介电损耗角正切值（tanδ=ε″/ε′）分别为2. 77~7. 93、1. 38~6. 41和0. 49~0. 81, 磁导率实部（μ′）和虚部（μ″）分别为0. 96~1. 12和-0. 05~0. 08。在2~18GHz频率范围内, 纤维/石蜡复合材料的反射率衰减大于10dB的频率为9. 12~18GHz, 最大衰减为28. 47dB, 对应频率为12GHz。反射率衰减大于10dB的频宽为8. 88GHz。
Cross-shaped SiC fibers were prepared from precursor polymer. The diameter of fiber’s circumcircle is about 34 μm, the length of vane is about 12μm, and the width of vane is 8μm. The complex permittivity and permeability of cross-shaped SiC fibers were measured by the coaxial line method at 2-18 GHz. The ε′, ε″, μ′, μ″ and tanδ of cross-shaped SiC fibers/paraffin wax composites are 2.77-7.93, 1.38-6.41, 0.96-1.12, -0.05-0.08, 0.49-0.81, respectively. Cross-shaped SiC fiber is a kind of dielectric loss materials. The reflection loss of the composites is below -10 dB at 9.12-18 GHz in the range of 2-18 GHz, and the minimum value is -28.47 dB at 12 GHz. The bandwidth corresponding to the reflection loss below -10 dB is 8.88 GHz.
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