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Compact dual-band bandpass filter with controllable bandwidths using stub-loaded multiple-mode resonator

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4 Author(s)
Chen, F.C. ; Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China ; Chu, Q.X. ; Li, Z.H. ; Wu, X.H.

A compact microstrip-line dual-band bandpass filter using a stub-loaded multiple-mode resonator is presented. This multiple-mode resonator is formed by loading three stubs (one short-circuited and two open-circuited stubs) in shunt to a simple uniform impedance resonator in the centre and two symmetrical locations, respectively. By properly adjusting the lengths of the three stubs, the first two resonant modes of this multiple-mode resonator can be allocated within the first passband, whereas the third and fourth resonant modes can be allocated within the second passband of the dual-band filter. This results in the formulation of a novel dual-band filter with compact-size and high isolation between passbands by incorporating this multiple-mode resonator with source-load coupling. Two coupling paths are used to control the bandwidth of each passband independently. To illustrate the concept, two dual-band filters of different frequency ratios are designed, fabricated and measured. Simulated and measured results are found to be in good agreement with each other, showing that a rejection level of 15 dB up to more than four times the first passband frequency can be obtained.

Published in:

Microwaves, Antennas & Propagation, IET  (Volume:6 ,  Issue: 10 )

Date of Publication:

July 17 2012

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