DUPLEXER BASED ON ELLIPTICAL MICRO-STRIP STRUCTURE

摘要

Disclosed is a duplexer based on an elliptical micro-strip structure. The duplexer comprises a dielectric plate, wherein the elliptical micro-strip structure and three input/output micro-strip lines are provided on a front face of the dielectric plate, the three input/output micro-strip lines are all rectangular input/output micro-strip lines and are respectively connected to the elliptical micro-strip structure, and a ground plate is located on a back face of the dielectric plate. The elliptical micro-strip structure of the present invention can achieve multi-mode filtering effects. The resonant frequency of a mode is controlled by changing the major axis and the minor axis of the elliptical micro-strip structure and changing the positions of ports of the three input/output micro-strip lines. The three input/output micro-strip lines are designed to be of a rectangular structure. One of the three input/output micro-strip lines can be selected for input, and the other two input/output micro-strip lines are selected for output, so that three operation states can be realized by means of the combination thereof. The present invention has the advantages of a small volume, a simple structure and being easy to process, and has a wide range of applications.