Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances

Film bulk acoustic wave resonators (FBARs) are of great interest for wireless applications due to its inherent advantages at microwave frequencies. However, the presence of spurious modes near the main resonance degrades the performance of resonators and requires development of new methods to suppre...

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Main Authors: P. Kumar, C. C. Tripathi
Format: Article
Language:English
Published: Spolecnost pro radioelektronicke inzenyrstvi 2013-09-01
Series:Radioengineering
Subjects:
Online Access:http://www.radioeng.cz/fulltexts/2013/13_03_0687_0693.pdf
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author P. Kumar
C. C. Tripathi
author_facet P. Kumar
C. C. Tripathi
author_sort P. Kumar
collection DOAJ
description Film bulk acoustic wave resonators (FBARs) are of great interest for wireless applications due to its inherent advantages at microwave frequencies. However, the presence of spurious modes near the main resonance degrades the performance of resonators and requires development of new methods to suppress such unwanted modes. Different techniques are used to suppress these spurious modes. In this paper, we present design of a new step-like frame structure film bulk acoustic wave resonator operating near 1.5 GHz. The simulated results are compared with simple frame-like structure. The spurious resonances are eliminated effectively and smooth pass band is obtained with effective coupling coefficient of 5.68% and quality factor of 1800. The equivalent electrical mBVD model of the FBAR based on impedance response is also presented. These highly smooth phase response and passband skirt steepness resonators are most demanding for the design of low cost, small size and high performance filters, duplexers and oscillators for wireless systems.
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spelling doaj.art-7111e4a6fbff400ebb480520b959c4e52022-12-21T17:34:32ZengSpolecnost pro radioelektronicke inzenyrstviRadioengineering1210-25122013-09-01223687693Design of a New Step-like Frame FBAR for Suppression of Spurious ResonancesP. KumarC. C. TripathiFilm bulk acoustic wave resonators (FBARs) are of great interest for wireless applications due to its inherent advantages at microwave frequencies. However, the presence of spurious modes near the main resonance degrades the performance of resonators and requires development of new methods to suppress such unwanted modes. Different techniques are used to suppress these spurious modes. In this paper, we present design of a new step-like frame structure film bulk acoustic wave resonator operating near 1.5 GHz. The simulated results are compared with simple frame-like structure. The spurious resonances are eliminated effectively and smooth pass band is obtained with effective coupling coefficient of 5.68% and quality factor of 1800. The equivalent electrical mBVD model of the FBAR based on impedance response is also presented. These highly smooth phase response and passband skirt steepness resonators are most demanding for the design of low cost, small size and high performance filters, duplexers and oscillators for wireless systems.www.radioeng.cz/fulltexts/2013/13_03_0687_0693.pdfFilm Bulk Acoustic Wave Resonatorstep-like framespurious resonanceeffective coupling coefficientCOMSOL Multiphysics
spellingShingle P. Kumar
C. C. Tripathi
Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances
Radioengineering
Film Bulk Acoustic Wave Resonator
step-like frame
spurious resonance
effective coupling coefficient
COMSOL Multiphysics
title Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances
title_full Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances
title_fullStr Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances
title_full_unstemmed Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances
title_short Design of a New Step-like Frame FBAR for Suppression of Spurious Resonances
title_sort design of a new step like frame fbar for suppression of spurious resonances
topic Film Bulk Acoustic Wave Resonator
step-like frame
spurious resonance
effective coupling coefficient
COMSOL Multiphysics
url http://www.radioeng.cz/fulltexts/2013/13_03_0687_0693.pdf
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