A Compact Quadruplexer-Integrated Filtering Power Divider

A compact quadruplexer with the functions of frequency division, selection, and power splitting/combining is presented in this article. Four tri-mode stub-loaded resonators were adopted to construct multifunctional a third-order filtering response. The four-channel passbands controlled realized independently by using distribution coupling configuration. output structure was designed be symmetrical equal division for each channel. To achieve satisfactory isolation performance, resistor loaded between open ends coupled lines microstrip operating at 1.1, 1.44, 1.73, 2.06 GHz fabricated. prototype circuit size only approximately 0.4 λ g × 0.59 . Moreover, isolations >27 dB within entire bands.