Improvement of Stopband Performance in  Parallel-Coupled Bandpass Filters  Using Quasi-Lumped Elements

Vitaliy Zhurbenko; Viktor Krozer; Peter Meincke

doi:10.1109/MWSYM.2008.4633224

Improvement of Stopband Performance in Parallel-Coupled Bandpass Filters Using Quasi-Lumped Elements

Vitaliy Zhurbenko, Viktor Krozer, Peter Meincke

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Abstract

This paper is aimed at improving the rejection level as well as overcoming the bandwidth limitations for classical coupled-line filters. A planar microwave coupled-line filter employing a quasi-lumped element resonator considerably improving the stopband characteristics is presented. The proposed bandpass filter has a compact footprint, and exhibits good stopband rejection with no repeated passband at twice the center frequency in comparison with the traditional coupled-line filter. By introducing the quasi-lumped element resonator, two transmission zeros at upper and lower stopbands are created, with adjustable locations of transmission zeros for desired performance. The device is fabricated in standard thick-film manufacturing technology. Based on parallel-coupled line theory, the impedance inverter model for this device is developed. The passband filter centered at 5.5 GHz with a 3 dB relative bandwidth of 60 % is implemented with an area of approximately lambda/6 times lambda/4. Measured and simulated results exhibit good agreement.

Original language	English
Title of host publication	IEEE MTT-S International Microwave Symposium Digest
Publisher	IEEE
Publication date	2008
Pages	547-550
ISBN (Print)	978-1-4244-1780-3
DOIs	https://doi.org/10.1109/MWSYM.2008.4633224
Publication status	Published - 2008
Event	2008 IEEE MTT-S International Microwave Symposium - Atlanta, United States Duration: 15 Jun 2008 → 20 Jun 2008 http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=4625375

Conference

Conference	2008 IEEE MTT-S International Microwave Symposium
Country/Territory	United States
City	Atlanta
Period	15/06/2008 → 20/06/2008
Internet address	http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=4625375

Bibliographical note

Copyright: 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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Cite this

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title = "Improvement of Stopband Performance in Parallel-Coupled Bandpass Filters Using Quasi-Lumped Elements",

abstract = "This paper is aimed at improving the rejection level as well as overcoming the bandwidth limitations for classical coupled-line filters. A planar microwave coupled-line filter employing a quasi-lumped element resonator considerably improving the stopband characteristics is presented. The proposed bandpass filter has a compact footprint, and exhibits good stopband rejection with no repeated passband at twice the center frequency in comparison with the traditional coupled-line filter. By introducing the quasi-lumped element resonator, two transmission zeros at upper and lower stopbands are created, with adjustable locations of transmission zeros for desired performance. The device is fabricated in standard thick-film manufacturing technology. Based on parallel-coupled line theory, the impedance inverter model for this device is developed. The passband filter centered at 5.5 GHz with a 3 dB relative bandwidth of 60 % is implemented with an area of approximately lambda/6 times lambda/4. Measured and simulated results exhibit good agreement.",

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N2 - This paper is aimed at improving the rejection level as well as overcoming the bandwidth limitations for classical coupled-line filters. A planar microwave coupled-line filter employing a quasi-lumped element resonator considerably improving the stopband characteristics is presented. The proposed bandpass filter has a compact footprint, and exhibits good stopband rejection with no repeated passband at twice the center frequency in comparison with the traditional coupled-line filter. By introducing the quasi-lumped element resonator, two transmission zeros at upper and lower stopbands are created, with adjustable locations of transmission zeros for desired performance. The device is fabricated in standard thick-film manufacturing technology. Based on parallel-coupled line theory, the impedance inverter model for this device is developed. The passband filter centered at 5.5 GHz with a 3 dB relative bandwidth of 60 % is implemented with an area of approximately lambda/6 times lambda/4. Measured and simulated results exhibit good agreement.

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