Spurious mode suppression in coupled resonator filters

Author

Fattinger, G.G. ; Muller, Philipp ; Aigner, Robert

Author_Institution

Infineon Technol. AG, Munich, Germany

fYear

2005

fDate

12-17 June 2005

Abstract

The coupled resonator filter (CRF) is a type of bulk-acoustic-wave (BAW) device in which two piezoresonators are stacked on top of each other in a way that a certain degree of acoustic interaction occurs. For a proper frequency response, a method for suppression of spurious resonances is of utmost importance. This is discussed theoretically and the measured results in resonator and filter response are shown. Moreover, interometric measurements of the surface displacement of a 1.8 GHz CRF device are investigated with respect to dispersion relation and its effects on spurious mode suppression.

Keywords

acoustic dispersion; acoustic resonator filters; bulk acoustic wave devices; crystal resonators; dispersion relations; interference suppression; 1.8 GHz; acoustic resonator filters; bandpass filters; bulk acoustic wave devices; coupled resonator filters; dispersion relations; microwave filters; piezoelectric resonator filters; spurious mode suppression; spurious resonance suppression; stacked piezoresonators; Acoustic devices; Acoustic measurements; Acoustic waves; Costs; Dispersion; Microwave filters; Multiaccess communication; Resonance; Resonant frequency; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2005 IEEE MTT-S International

ISSN

01490-645X

Print_ISBN

0-7803-8845-3

Type

conf

DOI

10.1109/MWSYM.2005.1516615

Filename

1516615