Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines

Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines

A new compact microstrip tunable bandpass filter with continuous control of center frequency and bandwidth is proposed in the paper. The proposed design is based on short parallel-coupled lines, which are tuned by properly loading varactors. The structure exhibits a pair of transmission poles and on...

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Bibliographic Details
Main Authors: Gang Zhang, Yanhui Xu, Xuedao Wang
Format: Article
Language:English
Published: IEEE 2018-01-01
Series:IEEE Access
Subjects:
Bandpass filter
tunable filter
microstrip
parallel-coupled lines
Online Access:https://ieeexplore.ieee.org/document/8240946/
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spelling doaj-918f12504a664a83a41d8ed99ec4bc392021-03-29T20:33:54ZengIEEEIEEE Access2169-35362018-01-0162962296910.1109/ACCESS.2017.27862968240946Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled LinesGang Zhang0https://orcid.org/0000-0003-4305-2567Yanhui Xu1Xuedao Wang2School of Electrical and Automation Engineering, Nanjing Normal University China, Nanjing, ChinaMinisterial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing, ChinaMinisterial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing, ChinaA new compact microstrip tunable bandpass filter with continuous control of center frequency and bandwidth is proposed in the paper. The proposed design is based on short parallel-coupled lines, which are tuned by properly loading varactors. The structure exhibits a pair of transmission poles and one-side passband edge transmission zero that can be flexibly adjusted for required positions. A thorough theoretical analysis is derived to estimate the performance of the proposed filter and verify the initial values of design parameters. To verify the design concept, a prototype is fabricated and measured. The fabricated circuit has an extreme compact size (smaller than 0.03&#x03BB;<sub>g</sub> &#x00D7; 0.1&#x03BB;<sub>g</sub>). The simulated and measured results agree well with the derived theory, and indicate wide tunable center frequencies (0.56-1.15 GHz) and 1-dB bandwidth (65-180 MHz).https://ieeexplore.ieee.org/document/8240946/Bandpass filtertunable filtermicrostripparallel-coupled lines
collection DOAJ
language English
format Article
sources DOAJ
author Gang Zhang
Yanhui Xu
Xuedao Wang
spellingShingle Gang Zhang
Yanhui Xu
Xuedao Wang
Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines
IEEE Access
Bandpass filter
tunable filter
microstrip
parallel-coupled lines
author_facet Gang Zhang
Yanhui Xu
Xuedao Wang
author_sort Gang Zhang
title Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines
title_short Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines
title_full Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines
title_fullStr Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines
title_full_unstemmed Compact Tunable Bandpass Filter With Wide Tuning Range of Centre Frequency and Bandwidth Using Short Coupled Lines
title_sort compact tunable bandpass filter with wide tuning range of centre frequency and bandwidth using short coupled lines
publisher IEEE
series IEEE Access
issn 2169-3536
publishDate 2018-01-01
description A new compact microstrip tunable bandpass filter with continuous control of center frequency and bandwidth is proposed in the paper. The proposed design is based on short parallel-coupled lines, which are tuned by properly loading varactors. The structure exhibits a pair of transmission poles and one-side passband edge transmission zero that can be flexibly adjusted for required positions. A thorough theoretical analysis is derived to estimate the performance of the proposed filter and verify the initial values of design parameters. To verify the design concept, a prototype is fabricated and measured. The fabricated circuit has an extreme compact size (smaller than 0.03&#x03BB;<sub>g</sub> &#x00D7; 0.1&#x03BB;<sub>g</sub>). The simulated and measured results agree well with the derived theory, and indicate wide tunable center frequencies (0.56-1.15 GHz) and 1-dB bandwidth (65-180 MHz).
topic Bandpass filter
tunable filter
microstrip
parallel-coupled lines
url https://ieeexplore.ieee.org/document/8240946/
work_keys_str_mv AT gangzhang compacttunablebandpassfilterwithwidetuningrangeofcentrefrequencyandbandwidthusingshortcoupledlines
AT yanhuixu compacttunablebandpassfilterwithwidetuningrangeofcentrefrequencyandbandwidthusingshortcoupledlines
AT xuedaowang compacttunablebandpassfilterwithwidetuningrangeofcentrefrequencyandbandwidthusingshortcoupledlines
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