Title :
Spurious mode suppression in coupled resonator filters
Author :
Fattinger, G.G. ; Muller, Philipp ; Aigner, Robert
Author_Institution :
Infineon Technol. AG, Munich, Germany
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;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1516615
