IEICE TRANSACTIONS on Electronics
Design and Fabrication of Three-Bit Reconfigurable Bandpass Filter Using Branch-Line Type Variable Resonator
Summary :
Current mobile communication terminals are equipped with multiple RF circuits that cover all frequency bands assigned for the communication. In order to make efficient use of frequency spectrum and to reduce circuits in a terminal, a low-loss reconfigurable RF filter is necessary to flexibly change RF frequencies. In this paper, a new reconfigurable bandpass filter (BPF) having eight-frequency (three-bit) selection capability is proposed. It employs branch-line switched type variable resonators that provide low insertion loss. One of the design issues is how to control pass bandwidths among selectable frequencies. In order to analyze the bandwidth variation of the reconfigurable BPF, we calculate the changes of external Q and coupling coefficients. It is shown that the inductive coupling design can achieve less variation of bandwidth for the reconfigurable BPF, compared with commonly used capacitive coupling design. A prototype BPF on a printed circuit board with high dielectric constant substrate has been fabricated and evaluated in 2 GHz bands. It presents performance very close to the design results with respect to insertion loss, center frequency and passband bandwidth. Low insertion loss of less than 1 dB is achieved among the eight frequencies.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E98-C No.7 pp.636-643
- Publication Date
- 2015/07/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.E98.C.636
- Type of Manuscript
- Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
- Category
- Microwaves, Millimeter-Waves
Authors
Ryosuke KOBAYASHI
Fujitsu Limited
Takumi KATO
The University of Electro-Communications
Kazuhiro AZUMA
CyberAgent, Inc.
Yasushi YAMAO
The University of Electro-Communications
Keyword
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Ryosuke KOBAYASHI, Takumi KATO, Kazuhiro AZUMA, Yasushi YAMAO, "Design and Fabrication of Three-Bit Reconfigurable Bandpass Filter Using Branch-Line Type Variable Resonator" in IEICE TRANSACTIONS on Electronics,
vol. E98-C, no. 7, pp. 636-643, July 2015, doi: 10.1587/transele.E98.C.636.
Abstract: Current mobile communication terminals are equipped with multiple RF circuits that cover all frequency bands assigned for the communication. In order to make efficient use of frequency spectrum and to reduce circuits in a terminal, a low-loss reconfigurable RF filter is necessary to flexibly change RF frequencies. In this paper, a new reconfigurable bandpass filter (BPF) having eight-frequency (three-bit) selection capability is proposed. It employs branch-line switched type variable resonators that provide low insertion loss. One of the design issues is how to control pass bandwidths among selectable frequencies. In order to analyze the bandwidth variation of the reconfigurable BPF, we calculate the changes of external Q and coupling coefficients. It is shown that the inductive coupling design can achieve less variation of bandwidth for the reconfigurable BPF, compared with commonly used capacitive coupling design. A prototype BPF on a printed circuit board with high dielectric constant substrate has been fabricated and evaluated in 2 GHz bands. It presents performance very close to the design results with respect to insertion loss, center frequency and passband bandwidth. Low insertion loss of less than 1 dB is achieved among the eight frequencies.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E98.C.636/_p
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@ARTICLE{e98-c_7_636,
author={Ryosuke KOBAYASHI, Takumi KATO, Kazuhiro AZUMA, Yasushi YAMAO, },
journal={IEICE TRANSACTIONS on Electronics},
title={Design and Fabrication of Three-Bit Reconfigurable Bandpass Filter Using Branch-Line Type Variable Resonator},
year={2015},
volume={E98-C},
number={7},
pages={636-643},
abstract={Current mobile communication terminals are equipped with multiple RF circuits that cover all frequency bands assigned for the communication. In order to make efficient use of frequency spectrum and to reduce circuits in a terminal, a low-loss reconfigurable RF filter is necessary to flexibly change RF frequencies. In this paper, a new reconfigurable bandpass filter (BPF) having eight-frequency (three-bit) selection capability is proposed. It employs branch-line switched type variable resonators that provide low insertion loss. One of the design issues is how to control pass bandwidths among selectable frequencies. In order to analyze the bandwidth variation of the reconfigurable BPF, we calculate the changes of external Q and coupling coefficients. It is shown that the inductive coupling design can achieve less variation of bandwidth for the reconfigurable BPF, compared with commonly used capacitive coupling design. A prototype BPF on a printed circuit board with high dielectric constant substrate has been fabricated and evaluated in 2 GHz bands. It presents performance very close to the design results with respect to insertion loss, center frequency and passband bandwidth. Low insertion loss of less than 1 dB is achieved among the eight frequencies.},
keywords={},
doi={10.1587/transele.E98.C.636},
ISSN={1745-1353},
month={July},}
Copy
TY - JOUR
TI - Design and Fabrication of Three-Bit Reconfigurable Bandpass Filter Using Branch-Line Type Variable Resonator
T2 - IEICE TRANSACTIONS on Electronics
SP - 636
EP - 643
AU - Ryosuke KOBAYASHI
AU - Takumi KATO
AU - Kazuhiro AZUMA
AU - Yasushi YAMAO
PY - 2015
DO - 10.1587/transele.E98.C.636
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E98-C
IS - 7
JA - IEICE TRANSACTIONS on Electronics
Y1 - July 2015
AB - Current mobile communication terminals are equipped with multiple RF circuits that cover all frequency bands assigned for the communication. In order to make efficient use of frequency spectrum and to reduce circuits in a terminal, a low-loss reconfigurable RF filter is necessary to flexibly change RF frequencies. In this paper, a new reconfigurable bandpass filter (BPF) having eight-frequency (three-bit) selection capability is proposed. It employs branch-line switched type variable resonators that provide low insertion loss. One of the design issues is how to control pass bandwidths among selectable frequencies. In order to analyze the bandwidth variation of the reconfigurable BPF, we calculate the changes of external Q and coupling coefficients. It is shown that the inductive coupling design can achieve less variation of bandwidth for the reconfigurable BPF, compared with commonly used capacitive coupling design. A prototype BPF on a printed circuit board with high dielectric constant substrate has been fabricated and evaluated in 2 GHz bands. It presents performance very close to the design results with respect to insertion loss, center frequency and passband bandwidth. Low insertion loss of less than 1 dB is achieved among the eight frequencies.
ER -
English
