Wideband Fully Tunable Bandpass Filter Based on Flexibly Multi-Mode Tuning

In this letter, a wideband fully tunable bandpass filter with three adjustable transmission poles is proposed. The fundamental structure consists of two half-wave length (λ/2) resonators with center-tapped open and shorted stubs. Due to the same odd-mode resonant frequency, these two dual-mode reson...

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Veröffentlicht in:	IEEE microwave and wireless components letters 2016-10, Vol.26 (10), p.789-791
Hauptverfasser:	Chen, Zhi-Han, Chu, Qing-Xin
Format:	Artikel
Sprache:	eng
Schlagworte:	Electric utilities Fully tunable filter Passband Resonant frequency transmission poles control Tuning Varactors Wideband Wireless communication Wood products
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creator	Chen, Zhi-Han Chu, Qing-Xin
description	In this letter, a wideband fully tunable bandpass filter with three adjustable transmission poles is proposed. The fundamental structure consists of two half-wave length (λ/2) resonators with center-tapped open and shorted stubs. Due to the same odd-mode resonant frequency, these two dual-mode resonators can form a wideband bandpass filter with three poles. Further, the fully tunable filter is designed by utilizing varactors to control three transmission poles flexibly. As a demonstrator, the prototypical filter with six varactors is implemented to validate the design concept. The filter reports 60.5% fractional bandwidth (FBW) at 2.48 GHz. In this state, the filter also achieves 138% FBW tuning and 20.8% center frequency tuning. Meanwhile, two transmission zeros (TZs) located at both sides of the passband are introduced by the center-tapped stubs to enhance the selectivity.
doi_str_mv	10.1109/LMWC.2016.2601280
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The fundamental structure consists of two half-wave length (λ/2) resonators with center-tapped open and shorted stubs. Due to the same odd-mode resonant frequency, these two dual-mode resonators can form a wideband bandpass filter with three poles. Further, the fully tunable filter is designed by utilizing varactors to control three transmission poles flexibly. As a demonstrator, the prototypical filter with six varactors is implemented to validate the design concept. The filter reports 60.5% fractional bandwidth (FBW) at 2.48 GHz. In this state, the filter also achieves 138% FBW tuning and 20.8% center frequency tuning. 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Meanwhile, two transmission zeros (TZs) located at both sides of the passband are introduced by the center-tapped stubs to enhance the selectivity.</description><subject>Electric utilities</subject><subject>Fully tunable filter</subject><subject>Passband</subject><subject>Resonant frequency</subject><subject>transmission poles control</subject><subject>Tuning</subject><subject>Varactors</subject><subject>Wideband</subject><subject>Wireless communication</subject><subject>Wood products</subject><issn>1531-1309</issn><issn>2771-957X</issn><issn>1558-1764</issn><issn>2771-9588</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kE1Lw0AQhhdRsFZ_gHgJeE6d2a8kRy3GD1q8VHpcdrtTSYlJzSZg_70bWjzt7PC8M8PD2C3CDBGKh8VyPZ9xQD3jGpDncMYmqFSeYqbl-VgLTFFAccmuQtgBoMwlTtj7uvLkbOOTcqjrQ7IaGutqSp5ia29DSMqq7qmL_0A-aZukrOm3cpFcDnVfpcvW0xiqmq9rdrG1daCb0ztln-Xzav6aLj5e3uaPi3QjedGnxDPHvXVWikxlCjQJ1OSLXGvaEjjnMqWVUFmhfS7yTCpJEsCSxA1XUoopuz_O3Xftz0ChN7t26Jq40mAuEBC05JHCI7Xp2hA62pp9V33b7mAQzKjMjMrMqMyclMXM3TFTEdE_H8_hshDiD_CwZYo</recordid><startdate>20161001</startdate><enddate>20161001</enddate><creator>Chen, Zhi-Han</creator><creator>Chu, Qing-Xin</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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subjects	Electric utilities Fully tunable filter Passband Resonant frequency transmission poles control Tuning Varactors Wideband Wireless communication Wood products
title	Wideband Fully Tunable Bandpass Filter Based on Flexibly Multi-Mode Tuning
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