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Design of a microstrip filter using multiple capacitively loaded coupled lines

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1 Author(s)
C. -w. Tang ; Dept. of Electr. Eng., Nat. Chung Cheng Univ., Chiayi

A method to design a microstrip filter has been proposed. The multiple capacitively loaded coupled lines are adopted for the design of the microstrip filter. The filter shows different stopband behaviour with respect to even or odd total number of resonators. The transmission zeros may be located around the lower, higher or both regions of the passband's skirt. The coupling among the capacitively loaded lines can produce another transmission zero particularly in the higher stopband. A bandpass filter and a duplexer utilising these features are designed. The equivalent model is also proposed to illustrate the filter's coupling among these capacitively loaded coupled lines. The design has been verified by experimental results

Published in:

IET Microwaves, Antennas & Propagation  (Volume:1 ,  Issue: 3 )