损耗电介质在镜像法测试装置中的应用

Application of lossy dielectric to image method measurement device

通过在校准头的耦合波导中填充介电常数为10,损耗角正切为0.6的损耗电介质材料,利用该介质对电磁波的损耗来近似测试头中的输入输出耦合环对电磁场能量的影响,以满足镜像法中测试头和校准头中电磁场分布一致这一要求。这一损耗介质材料的引入,改进了测试头和校准头的设计,使得测试头在取得较大耦合量的同时能保持与校准头的对称性,减小了以往测试装置低耦合量所引起的测试误差。

A lossy dielectric whose dielectric constant and loss tangent are 10 and 0.6 respectively is applied in the waveguide of calibration probe in order to simulate the influence of electric and magnetic field caused by the input and output coupling loop in the testing probe. The identical distribution of electric and magnetic field between testing probe and calibration probe is achieved. The application of lossy dielectric in the waveguide is capable of maintaining the symmetry between testing probe and calibration probe while the testing probe has moderate coupling and reduce the measurement error caused by low coupling of testing probe in the early device of image method.