Tunable acoustic wave device
2002 (English)Patent (Other (popular science, discussion, etc.))
The invention discloses a tunable acoustic wave device (100; 200) comprising a piezoelectric material (120; 220) with a tunable dielectric permittivity. The dielectric permittivity of the material is tuned by applying a tuning electric field (190), preferably a DC-bias field, low frequency AC field, pulsed electric field or AC electric field superimposed onto an electric field pulse, thereto. By tuning the dielectric permittivity, the operation characteristics of the device (100; 200), including the acoustic wave velocity in the material (120; 220) and the resonance frequency and bandwidth of the device (100; 200), may be tuned. The tuning electric field (190) may applied by superimposing it onto the input high frequency electric field signal of the device (100; 200) or by applying it over at least a portion of the piezoelectric material (120; 220). A piezoelectric material (120; 220) with a tunable dielectric permittivity can be found in ceramic crystalline superparaelectric materials, e.g. perovskite niobates-tantalates.
Place, publisher, year, edition, pages
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-51756OAI: oai:DiVA.org:kth-51756DiVA: diva2:464920
SE 524009 (2004-06-15)
QC 20111214. QC 201308072011-12-142011-12-142013-08-07Bibliographically approved