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Phononic crystals (PnC) consist of two or more materials arranged in a spatially periodic manner. Introduction of a defect into the crystal lattice is a technique to create resonant modes. The idea behind the application of a PnC as sensor element is the dependence of the characteristic features of those modes on speed of sound. Currently the sensor designs are based on common 2D phononic crystal...
As more LTE bands are squeezed into the crowded global RF spectrum interference becomes a major concern. Some cases require profoundly steep transitions from passband to the tightly packed neighboring bands. The most demanding high frequency LTE bands may only be served with high-performance BAW resonators that have been temperature compensated to have essentially zero temperature drift. There is...
The 0-th shear horizontal (SH0) mode plate wave has an electromechanical coupling factor k2 larger than 50% in a (0°, 120°, 0°) LiNbO3 (LN) plate thinner than 0.1λ, where λ is a pitch of an intergidital transducer (IDT). In the previous study, ultra-wide-band ladder filters composed of cavity type resonators recorded 6 dB bandwidth from 41% to 51% in a digital TV band. However, the structure is fragile,...
This work deals with the possibility to create a high temperature surface acoustic waves (SAW) sensor based on the use of a new piezoelectric material : Ba2TiSi2O8.The wave propagation in the material is at first studied and compared to another material used for harsh environment : LiTaO3. Then a SAW resonator on Ba2TiSi2O8 is designed.
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