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Quasi-elliptic dual-band bandpass filters based on series-cascaded multi-resonant cells

Part of: EuMW Special issue 2019

Published online by Cambridge University Press:  22 June 2020

Andrea Ashley Open the ORCID record for Andrea Ashley [Opens in a new window] ,
Dakotah J. Simpson Open the ORCID record for Dakotah J. Simpson [Opens in a new window]  and
Dimitra Psychogiou
Andrea Ashley*
Affiliation:
Department of Electrical, Computer, and Energy Engineering, University of Colorado Boulder, Boulder, CO, USA
Dakotah J. Simpson
Affiliation:
Department of Electrical, Computer, and Energy Engineering, University of Colorado Boulder, Boulder, CO, USA
Dimitra Psychogiou
Affiliation:
Department of Electrical, Computer, and Energy Engineering, University of Colorado Boulder, Boulder, CO, USA
*
Author for correspondence: Andrea Ashley, E-mail: andrea.ashley@colorado.edu
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Abstract

This paper reports on quasi-elliptic dual-band bandpass filters (BPFs) that were designed for the Filter Student Design Competition of the 2019 European Microwave Week. The proposed lumped-element (LE) BPF concept is based on two dual-band transversal cells and one multi-resonant cell that allow the realization of symmetric and asymmetric dual-band transfer functions shaped by six poles and five transmission zeros. A compact implementation scheme based on LE series resonators is proposed for size compactness and wide spurious free out-of-band response. For proof-of-concept demonstration purposes, a dual-band LE prototype with two passbands centered 1 and 1.5 GHz was designed, manufactured, and measured. It exhibited the following radio frequency measured performance characteristics. Passbands centered at 1.02 and 1.45 GHz, minimum insertion loss levels of 2.0 and 2.7 dB, and bandwidth of 146 and 105 MHz, respectively, for the first and the second passband, and out-of-band rejection >30 dB between 0 and 894 MHz, 1.17–1.34 GHz, and 1.72–6.9 GHz.

Keywords

Bandpass filter (BPF)dual-band filterlumped-element filterminiaturized filtermulti-band filter
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Special Issue 7: EuMW 2019 Special Issue , September 2020 , pp. 609 - 614
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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