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Tunable dual-band resonators for communication systems

Published online by Cambridge University Press:  09 June 2010

David Girbau ,
Antonio Lázaro ,
Albert Pérez ,
Esther Martínez ,
Lluís Pradell  and
Ramón Villarino
David Girbau*
Affiliation:
Universitat Rovira I Virgili, DEEEiA, 26 Avenue Països Catalans, 43007 Tarragona, Catalunya, Spain.
Antonio Lázaro
Affiliation:
Universitat Rovira I Virgili, DEEEiA, 26 Avenue Països Catalans, 43007 Tarragona, Catalunya, Spain.
Albert Pérez
Affiliation:
Universitat Politècnica DE Catalunya, TSC, 1-3 Jordi Girona, 08034 Barcelona, Catalunya, Spain.
Esther Martínez
Affiliation:
Universitat Politècnica DE Catalunya, TSC, 1-3 Jordi Girona, 08034 Barcelona, Catalunya, Spain.
Lluís Pradell
Affiliation:
Universitat Politècnica DE Catalunya, TSC, 1-3 Jordi Girona, 08034 Barcelona, Catalunya, Spain.
Ramón Villarino
Affiliation:
Universitat Rovira I Virgili, DEEEiA, 26 Avenue Països Catalans, 43007 Tarragona, Catalunya, Spain.
*
Corresponding author: D. Girbau Email: david.girbau@urv.cat
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Abstract

This paper proposes the design of tunable dual-band resonators for multi-band multi-standard systems. The main objective is to provide frequency tunability in the second resonance while maintaining the first resonance fixed. To this end, two tunable resonators are proposed: the capacitive-loaded stepped-impedance resonator and the capacitive-loaded hole resonator. The work is divided into two main parts. In the first part, an in-depth analysis of the capacitive-loaded stepped-impedance resonator (SIR) structure is done; it provides analytical closed-form design equations that ease the resonator design in contrast to the several approaches available in the literature to date. The analysis is also particularized to the case of the capacitive-loaded constant-section resonator and extended to the capacitive-loaded hole resonator. In addition, a study of the quality factor in capacitively tuned SIRs is also provided. In the second part, resonators are integrated in three dual-band tunable filters, one based on the capacitive-loaded constant-section resonator, another one on the capacitive-loaded SIR, and finally on the capacitive-loaded hole resonator. Two of these filters demonstrate operation in wireless local-area network frequency bands, with a fixed first band at 2.45 GHz and a second band which can be tuned between 5.75 and 5.25 GHz.

Keywords

FilterDual bandMulti-standardStepped-impedance resonator
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 2 , Special Issue 3-4: European Microwave Week 2009 , August 2010 , pp. 245 - 253
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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