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Progress In Electromagnetics Research C
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A NOVEL COUPLING METHOD TO DESIGN A MICROSTRIP BANDPASS FILER WITH A WIDE REJECTION BAND

By R.-Y. Yang, J.-S. Lin, and H. S. Li

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Abstract:
In this paper, we present a novel method to design a microstrip bandpass filter (BPF) with high selectivity and upper rejection band. The proposed coupling structure mainly composes of half-wavelength input/output (I/O) microstript lines and open-loop ring resonators. By properly selecting the coupling position between the I/O lines and resonators, the spurious response of the BPF can be well suppressed. A filter example centered at 2.4 GHz achieves a high band selectivity and a wide upper-stopband rejection greater than 20 dB from 2.7 to 6 GHz. Experimental results show a good agreement with the simulated ones.

Citation:
R.-Y. Yang, J.-S. Lin, and H. S. Li, "A Novel Coupling Method to Design a Microstrip Bandpass Filer with a Wide Rejection Band," Progress In Electromagnetics Research C, Vol. 14, 45-52, 2010.
doi:10.2528/PIERC10042506

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