Design of Microstrip Multifunction Integrated Diplexers With Frequency Division, Frequency Selection, and Power Division Functions

In this study, a novel circuit model was proposed for the design of multifunction integrated diplexers with frequency division, selection, and power division functions. The highly multifunctional diplexer mainly comprises only two different-frequency multimode resonators isolation resistors, which results in compact size. distributed coupling technique adopted to integrate resonators. One resonator used form channel passband, other another passband. Moreover, each passband can be independently designed flexibly allocated. resistors loaded between output feeding lines were introduced improve impedance matching ports channel. structures, theoretical analysis, procedure are described. For demonstration, second-order third-order filtering responses fabricated using microstrip technology. experiment simulation consistent indicated satisfactory in-band out-of-band performance.