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Progress In Electromagnetics Research
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AN APPROACH FOR MULTI-BAND BANDPASS FILTER DESIGN BASED ON ASYMMETRIC HALF-WAVELENGTH RESONATORS

By X. Li and H. Wang

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Abstract:
This paper presents that the extra passband with two transmission zeros can be obtained by adding shunt open stubs to the asymmetric half-wavelength resonators structure. By using this method, a fourth or even higher passband with good selectivity and compact size can be obtained. Dual-band, tri-band and quad-band bandpass filters are demonstrated by using this method. The measured bandwidth is 80/180 MHz for the dual-band, 60/180/180 MHz for the tri-band and 130/360/170/70MHz for the quad-band filter, respectively. The measured insertion loss for the dual-band, tri-band and quad-band filter is less than 2.7 dB, 2.5 dB and 2.9 dB at the center frequency. All the simulated results and the measured results agree well.

Citation:
X. Li and H. Wang, "An Approach for Multi-Band Bandpass Filter Design Based on Asymmetric Half-Wavelength Resonators," Progress In Electromagnetics Research, Vol. 140, 31-42, 2013.
doi:10.2528/PIER13031504
http://www.jpier.org/PIER/pier.php?paper=13031504

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