Laterally coupled narrow-band high overtone bulk wave filters using thinned single crystal lithium niobate layers

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 LiNbO 3 thinned films bonded on thick LiNbO 3 or Quartz substrates. Two resonators are coupled via a narrow gap between their electrod...

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Bibliographic Details
Main Authors: Gachon, D., Baron, T., Martin, G., Lebrasseur, E., Courjon, E., Bassignot, F., Ballandras, S.
Format: Conference Proceeding
Language:English
Subjects:
Couplings
Lithium niobate
Microwave filters
Resonant frequency
Resonator filters
Substrates
Transfer functions
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Summary: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 LiNbO 3 thinned films bonded on thick LiNbO 3 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.
ISSN:2327-1914
DOI:10.1109/FCS.2011.5977760