波导法测量材料的电容率和磁导率

Waveguide method for measuring the capacitivity and permeability of materials

通过求解电磁场的边值问题,推导出矩形波导管中,介质板的反射系数r和透射系数t,同时还推导出由介质板的r和t确定材料的ε和μ的公式.与传统的“自由空间法”相比,“波导法”测量材料的ε和μ具有实验操作简便、所需样品面积小、测量误差小等优势.

By solving the boundary value problem of electromagnetic field, the reflection coefficient r and the transmission coefficient t of dielectric slab in rectangular waveguide were derived. At the same time, the formulas of determining the capacitivity ε and the permeability μ of materials from r and t of dielectric slab were also derived. Compared with the traditional free-space method, the waveguide method for measuring the capacitivity and permeability of materials had the advantages of experimental simplicity and convenience, small sample area, and little measurement error.