含损耗介质和谐振子复合材料的电磁参数测定与反射系数计算
PERMEABILITY AND PERMITTIVITY MEASUREMENT AND REFLECTIVITY CALCULATION FOR MICROWAVE ABSORBING COMPOSITE MATERIAL CONTAINNING RESONATOR AND ELECTROMAGNETIC LOSSY SUBSTANCE
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摘要: 制备了一种含损耗介质和谐振子的环氧树脂基微波吸收复合材料,在8.2～12.4GHz频率范围内作了复合材料的电磁参数测试.结果表明:这种复合材料的磁损耗很小,主要损耗机制是介电损耗.由传输线等效电路模拟吸波复合材料,根据输入阻抗计算电磁波反射系数,给出了功率反射系数计算的BASIC程序.并把计算结果与扫频测试结果作了对比.对比结果表明:理论计算与实测的功率反射系数随频率的变化规律基本一致.Abstract: A kind of microwave absorbing material consisting of electromagnetic lossy substance,resonator and epoxy resin was prepared.The permeability and permittivitp of the composite were measured by using of an HP8510B microwave vector network analyzer.It has been found that the material works mainly in dielectric loss mechanism.Whereas the magnetic loss is trival in microwave attenuation.An equivalent circuit was used to simulate the composite in electromagnetic field followed by impedance analysis and power reflectivity calculation was carried out in a BASIC program. The tendancy of reflectivity variation with irequeacy determined by calculation is basically in agreement with that revealed by frequency scanning experiment performed with an HP8410C network analyzer.
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