Title :
Laterally coupled narrow-band high overtone bulk wave filters using thinned single crystal lithium niobate layers
Author :
Gachon, Dorian ; Baron, Thomas ; Martin, Gilles ; Lebrasseur, Eric ; Courjon, Emilie ; Bassignot, Florent ; Ballandras, Sylvain
Author_Institution :
Lab. PROMES, Univ. de Perpignan, Perpignan, France
Abstract :
This work is devoted to the development of laterally coupled filters built on compound single crystal substrates. High overtone bulk acoustic resonators are built on LiNbO3 thinned films bonded on thick LiNbO3 or Quartz substrates. Two resonators are coupled via a narrow gap between their electrodes, yielding the possibility for their modes to interact and to produce coupled mode resonance conditions. The coupling efficiency is shown to be dependent on the frequency (wavelength), yielding well defined coupled-mode filters at intermediate frequencies (300-800 MHz) and single mode transfer functions above 1 GHz. The implementation of an oscillator stabilized by such a filter at 1.7 GHz is demonstrated.
Keywords :
UHF filters; acoustic resonator filters; lithium compounds; quartz; surface acoustic wave resonators; LiNbO3; SiO2; compound single crystal substrate; frequency 1.7 GHz; frequency 300 MHz to 800 MHz; narrow band high overtone bulk wave filter; oscillator; quartz substrate; single mode transfer function; thinned single crystal lithium niobate layers; Couplings; Lithium niobate; Microwave filters; Resonant frequency; Resonator filters; Substrates; Transfer functions;
Conference_Titel :
Frequency Control and the European Frequency and Time Forum (FCS), 2011 Joint Conference of the IEEE International
Conference_Location :
San Fransisco, CA
Print_ISBN :
978-1-61284-111-3
DOI :
10.1109/FCS.2011.5977760