Symmetric/Asymmetrical SIRs Dual-Band BPF Design for WLAN Applications

Min-Hua HO; Hao-Hung HO; Mingchih CHEN

doi:10.1587/transele.E92.C.1137

Symmetric/Asymmetrical SIRs Dual-Band BPF Design for WLAN Applications

Min-Hua HO, Hao-Hung HO, Mingchih CHEN

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This paper presents the dual-band bandpass filters (BPFs) design composed of λ/2 and symmetrically/asymmetrically paired λ/4 stepped impedance resonators (SIRs) for the WLAN applications. The filters cover both the operating frequencies of 2.45 and 5.2 GHz. The dual-coupling mechanism is used in the filter design to provide alternative routes for signals of selected frequencies. A prototype filter is composed of λ/2 and symmetrical λ/4 SIRs. The enhanced wide-stopband filter is then developed from the filter with the symmetrical λ/4 SIRs replaced by the asymmetrical ones. The asymmetrical λ/4 SIRs have their higher resonances frequencies isolated from the adjacent I/O SIRs and extend the enhanced filter an upper stopband limit beyond ten time the fundamental frequency. Also, the filter might possess a cross-coupling structure which introduces transmission zeros by the passband edges to improve the signal selectivity. The tapped-line feed is adopted in this circuit to create additional attenuation poles for improving the stopband rejection levels. Experiments are conducted to verify the circuit performance.

Publication: IEICE TRANSACTIONS on Electronics Vol.E92-C No.9 pp.1137-1143

Publication Date: 2009/09/01

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Online ISSN: 1745-1353

DOI: 10.1587/transele.E92.C.1137

Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies and Their Applications)

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Min-Hua HO, Hao-Hung HO, Mingchih CHEN, "Symmetric/Asymmetrical SIRs Dual-Band BPF Design for WLAN Applications" in IEICE TRANSACTIONS on Electronics, vol. E92-C, no. 9, pp. 1137-1143, September 2009, doi: 10.1587/transele.E92.C.1137.
Abstract: This paper presents the dual-band bandpass filters (BPFs) design composed of λ/2 and symmetrically/asymmetrically paired λ/4 stepped impedance resonators (SIRs) for the WLAN applications. The filters cover both the operating frequencies of 2.45 and 5.2 GHz. The dual-coupling mechanism is used in the filter design to provide alternative routes for signals of selected frequencies. A prototype filter is composed of λ/2 and symmetrical λ/4 SIRs. The enhanced wide-stopband filter is then developed from the filter with the symmetrical λ/4 SIRs replaced by the asymmetrical ones. The asymmetrical λ/4 SIRs have their higher resonances frequencies isolated from the adjacent I/O SIRs and extend the enhanced filter an upper stopband limit beyond ten time the fundamental frequency. Also, the filter might possess a cross-coupling structure which introduces transmission zeros by the passband edges to improve the signal selectivity. The tapped-line feed is adopted in this circuit to create additional attenuation poles for improving the stopband rejection levels. Experiments are conducted to verify the circuit performance.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E92.C.1137/_p

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@ARTICLE{e92-c_9_1137,
author={Min-Hua HO, Hao-Hung HO, Mingchih CHEN, },
journal={IEICE TRANSACTIONS on Electronics},
title={Symmetric/Asymmetrical SIRs Dual-Band BPF Design for WLAN Applications},
year={2009},
volume={E92-C},
number={9},
pages={1137-1143},
abstract={This paper presents the dual-band bandpass filters (BPFs) design composed of λ/2 and symmetrically/asymmetrically paired λ/4 stepped impedance resonators (SIRs) for the WLAN applications. The filters cover both the operating frequencies of 2.45 and 5.2 GHz. The dual-coupling mechanism is used in the filter design to provide alternative routes for signals of selected frequencies. A prototype filter is composed of λ/2 and symmetrical λ/4 SIRs. The enhanced wide-stopband filter is then developed from the filter with the symmetrical λ/4 SIRs replaced by the asymmetrical ones. The asymmetrical λ/4 SIRs have their higher resonances frequencies isolated from the adjacent I/O SIRs and extend the enhanced filter an upper stopband limit beyond ten time the fundamental frequency. Also, the filter might possess a cross-coupling structure which introduces transmission zeros by the passband edges to improve the signal selectivity. The tapped-line feed is adopted in this circuit to create additional attenuation poles for improving the stopband rejection levels. Experiments are conducted to verify the circuit performance.},
keywords={},
doi={10.1587/transele.E92.C.1137},
ISSN={1745-1353},
month={September},}

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TY - JOUR
TI - Symmetric/Asymmetrical SIRs Dual-Band BPF Design for WLAN Applications
T2 - IEICE TRANSACTIONS on Electronics
SP - 1137
EP - 1143
AU - Min-Hua HO
AU - Hao-Hung HO
AU - Mingchih CHEN
PY - 2009
DO - 10.1587/transele.E92.C.1137
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E92-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 2009
AB - This paper presents the dual-band bandpass filters (BPFs) design composed of λ/2 and symmetrically/asymmetrically paired λ/4 stepped impedance resonators (SIRs) for the WLAN applications. The filters cover both the operating frequencies of 2.45 and 5.2 GHz. The dual-coupling mechanism is used in the filter design to provide alternative routes for signals of selected frequencies. A prototype filter is composed of λ/2 and symmetrical λ/4 SIRs. The enhanced wide-stopband filter is then developed from the filter with the symmetrical λ/4 SIRs replaced by the asymmetrical ones. The asymmetrical λ/4 SIRs have their higher resonances frequencies isolated from the adjacent I/O SIRs and extend the enhanced filter an upper stopband limit beyond ten time the fundamental frequency. Also, the filter might possess a cross-coupling structure which introduces transmission zeros by the passband edges to improve the signal selectivity. The tapped-line feed is adopted in this circuit to create additional attenuation poles for improving the stopband rejection levels. Experiments are conducted to verify the circuit performance.
ER -