高温环境下低损耗材料电磁参数测试系统设计

Design of Electromagnetic Parameter Test System for Low Loss Materials Under High Temperature Environment

为了准确评估低损耗材料在1200℃高温环境下的电磁性能,基于波导传输反射法构建低损耗材料电磁参数测试系统,实现宽频带变温特性的测试。采用磁控管微波加热技术快速且精准控制变温环境,通过精确测量波导中电磁波的传输特性,实现了对低损耗材料在高温环境下宽频带介电常数和磁导率的准确测量。高温实验以熔融石英为被测件得到的介电常数和磁导率相比标准值的测试误差小于2%,损耗角正切测试误差小于0.003+10%tanσ_(ε),结果表明所设计系统具有高测量精度、强抗干扰能力和鲁棒性,能够实现对低损耗材料的高温电磁参数性能测试。

In order to accurately evaluate the electromagnetic properties of low-loss materials at 1200℃,the electromagnetic parameter testing system of low-loss materials based on the waveguide transmission reflection method is constructed to test the wide-band temperature variable characteristics.The magnetron microwave heating technology is used to quickly and accurately control the temperature-changing environment.By accurately measuring the transmission characteristics of electromagnetic waves in the waveguide,the wide band dielectric constant and permeability of low-loss materials under high temperature environments are accurately measured.In high temperature experiments,the test error of dielectric constant and permeability obtained by using fused quartz as the measured component is less than 2%compared with the standard value,and the test error of loss Angle tangent is less than 0.003+10%tanσ.The results show that the designed system has high measurement accuracy,strong anti-interference ability and robustness,and can realize the performance test of electromagnetic parameters at high temperature for low-loss materials.