Novel dual-band rectangular dielectric resonator filter

A novel approach of dual-band filters´ design has been proposed operating in both basic TE10b and higher TE20b modes of rectangular dielectric resonator. The researched dual-band filter consists of two equal elongated dielectric resonators with approximately equal coupling coefficients in both modes. In order to prove the concept, the coupling coefficients dependencies on the parameters of filter structure have been studied by utilizing the numerical method as well as the analytical solution of dual-band filter has been built showing good agreement with the simulation results by finite elements´ method. The proposed dual-band filter can be used for multi-band applications in wireless networks.