LAUSR

A compact size and high isolation diplexer‐integrated filtering power divider (D‐IFPD) is presented in this study. The proposed multifunctional circuit consists of one distributed coupling feeding line, two different stub‐loaded trimode resonators, and two open‐ended three‐line parallel coupled lines. With the utilization of the distributed coupling technique, no additional matching circuit is needed for D‐IFPD design. The measured results show that the proposed D‐IFPD is centered at 1.67/2.17 GHz with 3‐dB fractional bandwidths of 18.0%/12.9%, less than 0.73/1.24 dB insertion losses, better than 16.5/15 dB return losses, and higher than 35.9 dB isolation.