Multiport Dual-Functional Circuits With Filtering and Power Dividing Operations Using Single Dielectric Resonator

A novel concept for utilizing a single dielectric resonator (DR) to fulfill a dual-mode bandpass filter (BPF) and a power divider (PD) simultaneously is proposed. A stepped rectangular DR is employed and two of its modes are, respectively, applied to the two functions. The fields of the modes are orthogonal and their frequencies can be flexibly controlled so that the BPF and PD are able to operate with high isolation and adjustable frequency bands. In the BPF part, one of the shielding cavity modes is also introduced to form a dual-mode characteristic. According to the symmetry of the electromagnetic fields, the PD part is designed in three forms: 1-to-2 PD with in-phase outputs, 1-to-2 PD with antiphase outputs, and 1-to-4 PD. As a result, three dual-functional combinations are achieved. For demonstration, the proposed dual-function applications sharing the common DR in high circuit integration are implemented and measured.