Higher-order modes in dielectric resonators for measurement of loss tangent

The paper focuses on the utilisation of higher-order shielded dielectric re sonator modes to measure the loss tangent of a dielectric resonator and its variation with frequency. Using a full-wave, rigorous mode-matching techni que, resonant frequencies and energy storage/power loss inside the cavity a re determined for several resonant modes. Resonant modes with high electric and magnetic energy filling factors are identified and subsequently used i n the measurement. By measuring the loss tangent at the resonant frequency of each chosen higher-order resonant mode, the frequency variation of the l oss tangent can be established. Therefore the task of measuring the frequen cy variation of the loss tangent of dielectric resonators can be achieved w ith the use of a single specimen and metallic cavity.