Dual-Band Dielectric-Resonator Filters

A novel dual-band dielectric resonator constructed from a single piece of high-
K
ceramic substrate is presented in this paper. The proposed dual-band dielectric resonator is employed to implement dual-band filters whose center frequencies and bandwidths of the first and second passbands can be controlled independently. To illustrate the concept, two dual-band filters of this type with different bandwidth and separation of two passbands are designed, fabricated, and measured. The filters are both compact in size with a great simplicity in assembly and integration. The developed dual-band dielectric-resonator filters are potentially applicable for multiband applications in future wireless communication systems.