Browsing by Author "Cheng, Eisenhower"

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Broadband quasi-Chebyshev bandpass filters with multimode stepped-impedance resonators (SIRs)
(2006-08-01)
Chiou, Yi-Chyun
;
Kuo, Jen-Tsai
;
Cheng, Eisenhower
;
電信工程研究所
;
Institute of Communications Engineering
Planar broadband bandpass filters of order up to 9 are synthesized based on the multimode property of stepped-impedance resonators (SIRs). Based on the transmission line theory, the modal frequencies of the SIRs are calculated based on the impedance and length ratios of its hi- and low-Z segments. In the synthesis, the SIR coupling schemes are determined by the split mode graphs. Using one, two, two, three, and three dual- or triple-mode SIRs, quasi-Chebyshev filters with,, six, six, eight, and nine transmission poles, respectively, are four synthesized with a fractional bandwidth (BW) Delta = 50%. Emphasis is placed not only on designing the I/O coupling structures for matching the external Q (Q(ext)) and the circuit BW, but also on matching the resonant peaks of the circuit, with. the nominal Chebyshev poles. Measured results of experimental circuits show good agreement with simulated responses.
High Selectivity Ultra-Wideband (UWB) Mutimode Stepped-Impedance Resonators (SIRs) Bandpass Filter with Two-Layer Broadside-Coupled Structure
(2007)
Kuo, Jen-Tsai
;
Chiou, Yi-Chyun
;
Cheng, Eisenhower
;
電信工程研究所
;
Institute of Communications Engineering
Ultra-wideband (UWB) bandpass filter with high selectivity response is contrived on the multimode characteristic of stepped-impedance resonators (SIRs). To achieve strong coupling requirement, two-layer broadside-coupled structure is employed. Using three triple-mode SIRs, quasi-Chebyshev filter with nine transmission poles is synthesized with a fractional bandwidth (BW) Delta = 110%. Measured results of experimental circuits show good agreement with simulated responses.