Matrix Analysis on Transmission Zero and Phase Difference in Dual-Band Filtering Power Divider

This paper presents a design approach of dual-band filtering power divider based on coupling matrix. To improve the band-to-band isolation, the generation mechanism of the transmission zero between the two bands has been analyzed. Be guided through the synthesized matrix, the phase difference between the outputs in the two bands can be adjusted to be in-phase or antiphase by altering the location of the feeding probes. Two prototypes using dual-mode dielectric resonator (DR) are designed to show the advantages of the proposed approach.