Dual-band balanced bpf using λ/4 steppedimpedance resonators and folded feed lines

Ching-Her Lee, I. C. Wang, C. I.G. Hsu

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

This paper presents a second-order dual-band balanced bandpass filter (BPF) designed using bi-section quarter-wavelength (λ/4) stepped-impedance resonators (SIRs) and folded feed lines. The first two modes of the λ/4 SIRs are designed to resonate in the designated 2.4- and 5.2-GHz WLAN bands. High-impedance folded transmission-line sections are inserted in series with the feed lines to improve the overall impedance matching at the input/output ports, so that the signal transmission can be enhanced. In addition, the feed lines and λ/4 SIRs are properly arranged to form an all-stoplike coupling configuration for common-mode operation. For the first (second) operating band of interest, the fabricated balanced BPF printed on an FR4 substrate was measured to have a minimum differential-mode insertion loss of 3.03 dB (4.3 dB) and a minimum common-mode rejection level of as high as 15.7 dB (22.3 dB).

Original languageEnglish
Pages (from-to)2441-2449
Number of pages9
JournalJournal of Electromagnetic Waves and Applications
Volume23
Issue number17-18
DOIs
Publication statusPublished - 2009 Jan 1

Fingerprint

Resonators
resonators
impedance
Bandpass filters
bandpass filters
Insertion losses
Wireless local area networks (WLAN)
signal transmission
impedance matching
Electric lines
insertion loss
rejection
transmission lines
Wavelength
Substrates
output
configurations
wavelengths

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

Cite this

@article{be56366d2d1d4ddfbad6fcc31d162f2e,
title = "Dual-band balanced bpf using λ/4 steppedimpedance resonators and folded feed lines",
abstract = "This paper presents a second-order dual-band balanced bandpass filter (BPF) designed using bi-section quarter-wavelength (λ/4) stepped-impedance resonators (SIRs) and folded feed lines. The first two modes of the λ/4 SIRs are designed to resonate in the designated 2.4- and 5.2-GHz WLAN bands. High-impedance folded transmission-line sections are inserted in series with the feed lines to improve the overall impedance matching at the input/output ports, so that the signal transmission can be enhanced. In addition, the feed lines and λ/4 SIRs are properly arranged to form an all-stoplike coupling configuration for common-mode operation. For the first (second) operating band of interest, the fabricated balanced BPF printed on an FR4 substrate was measured to have a minimum differential-mode insertion loss of 3.03 dB (4.3 dB) and a minimum common-mode rejection level of as high as 15.7 dB (22.3 dB).",
author = "Ching-Her Lee and Wang, {I. C.} and Hsu, {C. I.G.}",
year = "2009",
month = "1",
day = "1",
doi = "10.1163/156939309790416080",
language = "English",
volume = "23",
pages = "2441--2449",
journal = "Journal of Electromagnetic Waves and Applications",
issn = "0920-5071",
publisher = "Taylor and Francis Ltd.",
number = "17-18",

}

Dual-band balanced bpf using λ/4 steppedimpedance resonators and folded feed lines. / Lee, Ching-Her; Wang, I. C.; Hsu, C. I.G.

In: Journal of Electromagnetic Waves and Applications, Vol. 23, No. 17-18, 01.01.2009, p. 2441-2449.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dual-band balanced bpf using λ/4 steppedimpedance resonators and folded feed lines

AU - Lee, Ching-Her

AU - Wang, I. C.

AU - Hsu, C. I.G.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - This paper presents a second-order dual-band balanced bandpass filter (BPF) designed using bi-section quarter-wavelength (λ/4) stepped-impedance resonators (SIRs) and folded feed lines. The first two modes of the λ/4 SIRs are designed to resonate in the designated 2.4- and 5.2-GHz WLAN bands. High-impedance folded transmission-line sections are inserted in series with the feed lines to improve the overall impedance matching at the input/output ports, so that the signal transmission can be enhanced. In addition, the feed lines and λ/4 SIRs are properly arranged to form an all-stoplike coupling configuration for common-mode operation. For the first (second) operating band of interest, the fabricated balanced BPF printed on an FR4 substrate was measured to have a minimum differential-mode insertion loss of 3.03 dB (4.3 dB) and a minimum common-mode rejection level of as high as 15.7 dB (22.3 dB).

AB - This paper presents a second-order dual-band balanced bandpass filter (BPF) designed using bi-section quarter-wavelength (λ/4) stepped-impedance resonators (SIRs) and folded feed lines. The first two modes of the λ/4 SIRs are designed to resonate in the designated 2.4- and 5.2-GHz WLAN bands. High-impedance folded transmission-line sections are inserted in series with the feed lines to improve the overall impedance matching at the input/output ports, so that the signal transmission can be enhanced. In addition, the feed lines and λ/4 SIRs are properly arranged to form an all-stoplike coupling configuration for common-mode operation. For the first (second) operating band of interest, the fabricated balanced BPF printed on an FR4 substrate was measured to have a minimum differential-mode insertion loss of 3.03 dB (4.3 dB) and a minimum common-mode rejection level of as high as 15.7 dB (22.3 dB).

UR - http://www.scopus.com/inward/record.url?scp=75449086996&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=75449086996&partnerID=8YFLogxK

U2 - 10.1163/156939309790416080

DO - 10.1163/156939309790416080

M3 - Article

VL - 23

SP - 2441

EP - 2449

JO - Journal of Electromagnetic Waves and Applications

JF - Journal of Electromagnetic Waves and Applications

SN - 0920-5071

IS - 17-18

ER -