Ultra-Wideband, Differential-Mode Bandpass Filters with Four Coupled Lines Embedded in Self-Complementary Antennas

Akira SAITOU; Kyoung-Pyo AHN; Hajime AOKI; Kazuhiko HONJO; Koichi WATANABE

doi:10.1093/ietele/e90-c.7.1524

Ultra-Wideband, Differential-Mode Bandpass Filters with Four Coupled Lines Embedded in Self-Complementary Antennas

Akira SAITOU, Kyoung-Pyo AHN, Hajime AOKI, Kazuhiko HONJO, Koichi WATANABE

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A design method for an ultra-wideband bandpass filter (BPF) with four coupled lines has been developed. For demonstration purposes, 50 Ω-matched self-complementary antennas integrated with the ultra-wideband, differential-mode BPF with four coupled lines, a notch filter, and a low-pass filter (LPF) were prepared and tested. An optimized structure for a single-stage, broadside-coupled and edge-coupled four-lines BPF was shown to exhibit up to 170% fractional bandwidth and an impedance transformation ratio of 1.2 with little bandwidth reduction, both analytically and experimentally. Using the optimized structure, 6-stage BPFs were designed to transform the self-complementary antenna's constant input impedance (60πε_e^{- 1/2}(Ω)) to 50 Ω without degrading bandwidth. In addition, two types of filter variations--a LPF-embedded BPF and a notch filter-embedded BPF--were designed and fabricated. The measured insertion loss of both filter systems was less than 2.6 dB over the ultra-wideband (UWB) band from 3.1 GHz to 10.6 GHz. The filter systems were embedded in the wideband self-complementary antennas to reject unnecessary radiation over the next pass band and 5-GHz wireless LAN band.

Publication: IEICE TRANSACTIONS on Electronics Vol.E90-C No.7 pp.1524-1532

Publication Date: 2007/07/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1093/ietele/e90-c.7.1524

Type of Manuscript: PAPER

Category: Electronic Circuits

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Akira SAITOU, Kyoung-Pyo AHN, Hajime AOKI, Kazuhiko HONJO, Koichi WATANABE, "Ultra-Wideband, Differential-Mode Bandpass Filters with Four Coupled Lines Embedded in Self-Complementary Antennas" in IEICE TRANSACTIONS on Electronics, vol. E90-C, no. 7, pp. 1524-1532, July 2007, doi: 10.1093/ietele/e90-c.7.1524.
Abstract: A design method for an ultra-wideband bandpass filter (BPF) with four coupled lines has been developed. For demonstration purposes, 50 Ω-matched self-complementary antennas integrated with the ultra-wideband, differential-mode BPF with four coupled lines, a notch filter, and a low-pass filter (LPF) were prepared and tested. An optimized structure for a single-stage, broadside-coupled and edge-coupled four-lines BPF was shown to exhibit up to 170% fractional bandwidth and an impedance transformation ratio of 1.2 with little bandwidth reduction, both analytically and experimentally. Using the optimized structure, 6-stage BPFs were designed to transform the self-complementary antenna's constant input impedance (60πε_e^{- 1/2}(Ω)) to 50 Ω without degrading bandwidth. In addition, two types of filter variations--a LPF-embedded BPF and a notch filter-embedded BPF--were designed and fabricated. The measured insertion loss of both filter systems was less than 2.6 dB over the ultra-wideband (UWB) band from 3.1 GHz to 10.6 GHz. The filter systems were embedded in the wideband self-complementary antennas to reject unnecessary radiation over the next pass band and 5-GHz wireless LAN band.
URL: https://global.ieice.org/en_transactions/electronics/10.1093/ietele/e90-c.7.1524/_p

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@ARTICLE{e90-c_7_1524,
author={Akira SAITOU, Kyoung-Pyo AHN, Hajime AOKI, Kazuhiko HONJO, Koichi WATANABE, },
journal={IEICE TRANSACTIONS on Electronics},
title={Ultra-Wideband, Differential-Mode Bandpass Filters with Four Coupled Lines Embedded in Self-Complementary Antennas},
year={2007},
volume={E90-C},
number={7},
pages={1524-1532},
abstract={A design method for an ultra-wideband bandpass filter (BPF) with four coupled lines has been developed. For demonstration purposes, 50 Ω-matched self-complementary antennas integrated with the ultra-wideband, differential-mode BPF with four coupled lines, a notch filter, and a low-pass filter (LPF) were prepared and tested. An optimized structure for a single-stage, broadside-coupled and edge-coupled four-lines BPF was shown to exhibit up to 170% fractional bandwidth and an impedance transformation ratio of 1.2 with little bandwidth reduction, both analytically and experimentally. Using the optimized structure, 6-stage BPFs were designed to transform the self-complementary antenna's constant input impedance (60πε_e^{- 1/2}(Ω)) to 50 Ω without degrading bandwidth. In addition, two types of filter variations--a LPF-embedded BPF and a notch filter-embedded BPF--were designed and fabricated. The measured insertion loss of both filter systems was less than 2.6 dB over the ultra-wideband (UWB) band from 3.1 GHz to 10.6 GHz. The filter systems were embedded in the wideband self-complementary antennas to reject unnecessary radiation over the next pass band and 5-GHz wireless LAN band.},
keywords={},
doi={10.1093/ietele/e90-c.7.1524},
ISSN={1745-1353},
month={July},}

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TY - JOUR
TI - Ultra-Wideband, Differential-Mode Bandpass Filters with Four Coupled Lines Embedded in Self-Complementary Antennas
T2 - IEICE TRANSACTIONS on Electronics
SP - 1524
EP - 1532
AU - Akira SAITOU
AU - Kyoung-Pyo AHN
AU - Hajime AOKI
AU - Kazuhiko HONJO
AU - Koichi WATANABE
PY - 2007
DO - 10.1093/ietele/e90-c.7.1524
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E90-C
IS - 7
JA - IEICE TRANSACTIONS on Electronics
Y1 - July 2007
AB - A design method for an ultra-wideband bandpass filter (BPF) with four coupled lines has been developed. For demonstration purposes, 50 Ω-matched self-complementary antennas integrated with the ultra-wideband, differential-mode BPF with four coupled lines, a notch filter, and a low-pass filter (LPF) were prepared and tested. An optimized structure for a single-stage, broadside-coupled and edge-coupled four-lines BPF was shown to exhibit up to 170% fractional bandwidth and an impedance transformation ratio of 1.2 with little bandwidth reduction, both analytically and experimentally. Using the optimized structure, 6-stage BPFs were designed to transform the self-complementary antenna's constant input impedance (60πε_e^{- 1/2}(Ω)) to 50 Ω without degrading bandwidth. In addition, two types of filter variations--a LPF-embedded BPF and a notch filter-embedded BPF--were designed and fabricated. The measured insertion loss of both filter systems was less than 2.6 dB over the ultra-wideband (UWB) band from 3.1 GHz to 10.6 GHz. The filter systems were embedded in the wideband self-complementary antennas to reject unnecessary radiation over the next pass band and 5-GHz wireless LAN band.
ER -