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

Sohail Khalid, Wong Peng Wen and Lee Yen Cheong

Journal of Electromagnetic Waves and Applications, 2014, vol. 28, issue 8, 943-955

Abstract: 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(ω)$ F(\omega ) $ 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.

Date: 2014
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DOI: 10.1080/09205071.2014.898592

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