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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(More)
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(More)
A finite element analysis is performed to simulate thin film bulk acoustic wave (FBAR) structures, and a coupled finite element analysis/boundary integral method (FEA/BIM) is used to simulate accurately a radiation medium, like a Bragg mirror underneath a resonator, without having to mesh it entirely. Displacement fields are extracted from these(More)
Finite element method (FEM) has become an important approach in the modeling of bulk acoustic wave (BAW) resonators. Unfortunately FEM is not capable of describing unbounded regions, the substrate and the sides of the resonator. Perfectly matched layer (PML) can be used to prevent artificial reflection of the wave on the clamped sides, while the substrate(More)
Several models exist for analyzing the wave-guiding effect of a reflective grating. On the one hand, there are models based on scalar waveguide theory. These models consider that a device can be described as being made of several regions having different velocities. On the other hand, an extension of the coupling of modes (COM) model taking into account the(More)
The need for high-frequency, wide-band filters has instigated many developments based on combining thin piezoelectric films and high acoustic velocity materials (sapphire, diamond-like carbon, silicon, etc.) to ease the manufacture of devices operating above 2 GHz. In the present work, a technological process has been developed to achieve thin-oriented,(More)
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(More)
Nonlinearity distortion characterization and accurate modeling techniques for leaky surface acoustic wave (LSAW) devices have been desired in the recently years due to the applications of the Radio Frequency (RF) SAW duplexers in the third-generation (3G) telecommunication system, such as Universal Mobile Telecommunications System (UMTS). In the work, we(More)
The high-phase velocity (above 6100 m/s in an aluminum (Al) grating on lithium niobate (LiNbOs)) of the longitudinal leaky surface acoustic wave (SAW) (LLSAW) mode makes it attractive for application in high-frequency SAW ladder filters in the 2-5 GHz range. We investigate the dependence of one-port synchronous LLSAW resonator performance on YZ-LiNbO3 on(More)