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The SAW on rotated “leaky” Y-cuts LiTaO3 and LiNbO3 is a dominantly localized near surface slow shear-horizontal wave, which is weakly coupled to the fast shear bulk wave. Any surface perturbation can lead to radiation of bulk-acoustic waves from the device, increasing losses. To minimize this radiation, LSAW resonators are typically synchronous, with all electrodes in the IDT and in the reflectors...
SAW filter technology includes different substrates, multilayered electrodes from Al, Cu, Pt, …, dielectric sublayers and over-layers, etc. Temperature compensated SAW filters have been developed that have performance competitive with FBARs. Traditional design tools, such those as based on COM models, demand experimental characterization of wave propagation parameters. FEM/BEM models cannot be easily...
A CRF/DMS filter is simulated using “Layers” software [1-2]. We analyze a few different CRF/DMS structures, including the 10-port CRF device with passband frequency close to 1842.5 MHz including 5 IDTs, 8 “gap IDTs” and 2 reflectors. This TC SAW structure has a thick SiO2 over layer covering 274 Cu electrodes on a 128° LiNbO3 substrate. In addition to the electrical network parameters for the filter,...
A new type of acoustic wave device based on buried waves is proposed. Characteristic to the device is that wave guidance is achieved through the use of heavy metal electrodes buried deep inside a piezoelectric substrate. Such as a structure can be realized, for example, with wafer-wafer bonding techniques. In this work, simulations are used to characterize devices consisting of platinum electrodes...
Magnetic resonance imaging (MRI) thermometry is applied for guiding thermal therapy of tumorous tissues using high-intensity focused ultrasound (HIFU). Fast imaging sequences are needed for the on-line MRI operation, and strong artifacts on the temperature map can be found especially for image regions having poor signal-to-noise (S/N) ratio. Detection and masking of the regions with unreliable temperature...
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