| 摘要 |
PURPOSE: A duplexer for mobile communication is provided to prevent impedance mismatch and optimize transmitting characteristics of duplexer filter by improving the performance of filter. CONSTITUTION: A duplexer comprises a receiving unit(30) including a first MCC group(30d) for performing a coupling action with a plurality of dielectric resonators(DR) and input/output impedance control function, and a second MCC group(30d') for forming a plurality of attenuation poles at a stop band; and a transmitting unit(40) including a micro strip line(40e) for performing a coupling action with a plurality of dielectric resonators(DR) and input/output impedance control function, a third MCC group(40d) for forming a plurality of attenuation poles at a stop band, and a fourth MCC group(40d') for passage of a predetermined frequency band. The fourth MCC group of the transmitting unit has an MCC formed of an impedance matching element for providing a variable capacity for the input/output impedance matching between the micro strip line and the fourth MCC group.
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