Optimum filter synthesis procedure for ultra-wideband bandpass filter using step-impedance resonator
This paper introduces an approach to the optimum design of ultra-wideband (UWB) bandpass filter based on step-impedance resonator (SIR's). We consider a SIR resonator with parallel-coupled I/O line, where the filtering function can be easily derived based on conventional even-odd mode technique...
| Main Authors: | Khalid, S., Wen, W.P., Cheong, L.Y. |
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| Format: | Article |
| Institution: | Universiti Teknologi Petronas |
| Record Id / ISBN-0: | utp-eprints.31266 / |
| Published: |
VSP BV
2014
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| Online Access: |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898006503&doi=10.1080%2f09205071.2014.898592&partnerID=40&md5=f57ed56852eedcb546e29c226065ca10 http://eprints.utp.edu.my/31266/ |
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| Summary: |
This paper introduces an approach to the optimum design of ultra-wideband (UWB) bandpass filter based on step-impedance resonator (SIR's). We consider a SIR resonator with parallel-coupled I/O line, where the filtering function can be easily derived based on conventional even-odd mode technique. It was shown that the number of transmission poles depends on the length of low impedance section. The filtering function F(�) possesses a frequency-dependent sine term in the denominator yielding a non-Chebyshev response. In order to exhibit an optimum response in terms of selectivity from passband to stopband, technique of quasi-Chebyshev function approximation to achieve equiripple in the passband was synthesized. The present work shows a simple and direct method that allows for a computation of characteristic impedances to produce the equal-ripple bandpass filter with desired bandwidth and ripple level. A prototype of 5 GHz has been fabricated to validate proposed synthesis. © 2014 Taylor & Francis. |
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