Novel dual-mode double-band filter on dielectric resonators

In the paper a challenging problem of dual-band filter design on rectangular dielectric resonators (DRs) with no additional coupling elements or complication of DR shape has been researched. The possibility of operating on both higher TE_02δ oscillation mode ensuring greater values of unloaded Q-factor and the lower one TE_01δ has been investigated. The analytical model of dual-band filter has been developed, accounting for two bands simultaneously. The accuracy of the presented analytical model has been examined by simulation results using finite element method as well as by the conducted experiment, showing very good consistency. The proposed dual-band filter can be used for satellite systems that require noncontiguous in frequency channels to be transmitted to the ground through one beam.