摘要
通过从HP8722ET网络分析仪提取散射参数,研究了以乙丙橡胶为基体,磁性材料羰基铁粉为吸收剂的微波吸收材料同轴测试样品在同轴夹具中位置L1与样品长度L2的测量误差对其电磁参数测量结果的影响,提出了减小测量误差的方法。结果表明:在2.6～18GHz范围内,L1存在-0.08mm的绝对误差使得相对介电常数实部ε′与虚部ε″,相对磁导率实部μ′与虚部μ″的测量值与真实值的最大相对误差值分别达3.1%、168.0%、3.7%和-10.0%;L2存在-2%的相对误差使得ε′、ε″、μ′和μ″的测量值与真实值的最大相对误差值分别达3.5%、30.0%、4.0%和5.0%。采用光学显微镜的静态方法测量样品长度和使用辅助定位夹具可以减小测量误差,提高电磁参数测试结果的精确度。
Taking ethylene propylene rubber and carbonyl iron powder as the coaxial sample, the effects of measuring error for its position in the coaxial line L1 and its length L2 on measuring results of electromagnetic parameters are studied by extracting scattering parameters from Vector network analyzer HP8722ET. The method for reducing measuring errors is also presented. The results indicate that maximum relative errors between measured values and true values for relative permittivity＇s real part ε′ and imaginary part ε″, relative permeability＇s real part μ′ and imaginary part μ″ are 3.1%, 168.0%, 3.7% and -10.0% respectively when L1＇s absolute error is -0.08mm in the range ot 2.6-18GHz, for ε′ ,ε″,μ′ and μ″ are 3.5%, 30.0%, 4.0% and 5.0% respectively when L2＇s relative error is -2% in the range of 2.6-18GHz. By employing optical microscope for static measurement of sample＇s length and using accessorial positioning fixture can reduce measuring errors and improve the accuracy of measuring results.
出处
《电波科学学报》
EI
CSCD
北大核心
2006年第2期293-297,共5页
Chinese Journal of Radio Science
关键词
传输/反射法
微波吸收材料
电磁参数
transmission/reflection method, microwave absorbing materials, electromagnetic parameters
