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Nonlinear intermodulation distortion inside duplexers is a limitation for the sensitivity of mobile devices receivers. A perturbation approach for non linear harmonic acoustic generation along the propagation of surface acoustic wave is derived. It is used to extend the P matrix model to non linear generation of harmonics and mixing products. Interface of the new model to harmonic balance simulators...
Buried electrodes SAW resonators on lithium niobate suffer from transverse mode spurii even if the acoustic velocity inside the resonator is faster than the acoustic velocity outside the resonator (i.e. when a ‘waveguiding’ condition is not established). In practical devices, the electrode end gaps play an important role since they constitute a very fast region and reflect the acoustic waves creating...
High coupling substrates using overcoat layers of silicon oxide for temperature compensation exhibit a strong affinity toward multi-mode behavior. Apodization, which is the standard technique to suppress the transverse modes, suffers from drawbacks such as reduction of the transduction efficiency and additional losses. By changing the transducer layout, the guiding can be improved and a “piston mode”...
It is known that a part of the loss of leaky SAW resonators is due to radiation of acoustic energy in the bus-bars. Many researchers are working on so-called phononic crystals. A 2-D grating of very strong reflectors allows these devices to fully reflect, for a given frequency band, any incoming wave. A new device based on the superposition of a regular SAW resonator and a 2-D periodic grating of...
It is known that a part of the loss of Leaky SAW resonators is due to radiation of acoustic energy in the bussbars. A lot of researchers are working on so called ldquoPhononic crystalsrdquo. A 2D grating of very strong reflectors allows these devices to fully reflect, for a given frequency band, any incoming wave. A new device, based on the superposition of a regular SAW resonator and of a 2D periodic...
In order to improve the temperature stability of RF SAW devices, it is worth adding a layer of SiO2 on the surface of the piezoelectric substrate. This paper presents an original method, which allows the computation of the Harmonic Admittance of an infinite periodic grating covered with an SiO2 overlay. The origins of this method can be found in a previous paper. By comparison with S. Ballandras and...
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