Permittivity measurement technology of flat dielectrics using microwave split-cavity method
The test method of split cylindrical resonator is studied in order to realize the nondestructive test of dielectric constant of flat dielectric materials in microwave band.The electromagnetic field analysis theory of split cylindrical resonator is introduced,and the accurate solution of electromagnetic field distribution in the cavity under dielectric loading is realized by using mode matching technology.The exact relationship between the resonant frequency of the cavity and the dielectric constant of the material is obtained.On the basis of theoretical analysis,a split resonator with cavity resonant frequency of 10 GHz is fabricated and compared with the previously developed closed resonator.The relative error of the measurement results of the real part of dielectric constant is less than 1%.Compared with similar foreign products,the real results of dielectric constant are basically consistent,and the measurement result of loss tangent of this device is closer to the reference value.Therefore,the microwave split cavity method can realize the nondestructive measurement of flat dielectric plates,with outstanding advantages such as high accuracy and convenient use.It can accurately test the dielectric constants of various flat dielectric materials with dielectric constant range of 1～20,tangent of loss angle 1×10-3～1×10-5 and plate thickness of 0.1～2.0 mm in the microwave frequency band.
split-cylinder cavitypermittivity measurementflat dielectric materialtangent of loss angle
国家科技期刊平台
NSTL
万方数据
维普
