Optimum filter synthesis procedure for ultra-wideband bandpass filter using step-impedance resonator

Khalid, S. and Wen, W.P. and Cheong, L.Y. (2014) Optimum filter synthesis procedure for ultra-wideband bandpass filter using step-impedance resonator. Journal of Electromagnetic Waves and Applications, 28 (8). pp. 943-955.

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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.

Item Type: Article
Impact Factor: cited By 3
Uncontrolled Keywords: Bandpass filters; Polynomials; Resonators, Characteristic impedance; Chebyshev polynomials; Filtering functions; Frequency-dependent; Function approximation; Number of transmissions; Step-impedance resonators; Ultra-wideband bandpass filters, Ultra-wideband (UWB)
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 25 Mar 2022 09:04
Last Modified: 25 Mar 2022 09:04
URI: http://scholars.utp.edu.my/id/eprint/31266

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