Acoustic surface waves in piezoelectric materials with periodic metal strips on the surface

Blötekjær, K.; Ingebrigtsen, K.A.; Skeie, Halvor

doi:10.1109/t-ed.1973.17807

Cited by 94 publications

(21 citation statements)

References 15 publications

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“…The concept of harmonic admittance [1,7] is of great utility for characterization of wave propagation under the imfinite periodic metal grating. Similar to effective dielectric permittivity function [8], which characterizes propagation of surface waves in a semi-infinite substrate, harmonic admittance is independent on the applied voltage and contains information about the wave characteristics in the analyzed substrate.…”

Section: Derivation Of Rational Approximation Of Admittancementioning

confidence: 99%

“…For well behaved Rayleigh-type and SH-type (shear horizontally polarized) SAW, the wave modes in the grating satisfy simple analytical equations of 'classic' dispersion employing the Ingebrigtsen's approximation of surface impedance [1], and two-parameter COM formalism [2], respectively. In these two cases, all necessary COM parameters can be determined if the edges of the Bragg stopbands are located for open-circuit (OC) and short-circuit (SC) gratings.…”

Section: Introductionmentioning

confidence: 99%

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3E-1 Fast Numerical Technique for Simulation of SAW Dispersion in Periodic Gratings and its Application to Some SAW Materials

Naumenko

Abbott²

2007

2007 IEEE Ultrasonics Symposium Proceedings

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A method for approximation of harmonic admittance of an infinite periodic grating, which takes into account interaction between SAW (or LSAW) and BAW, is presented. A numerical technique based on this method is non-iterative, fast and accurate and enables extraction of dispersion parameters from numerical admittance calculated at real-valued spectral frequencies. Excellent agreement with admittance can be obtained in a wide range of temporal and spectral frequencies, including the interval where there is a strong interaction between SAW and BAW. Application of the method to different types of surface waves -Rayleigh-type SAW in LiNbO 3 , SH-type leaky waves in LiTaO 3 and high-velocity LH-type leaky wave in Li 2 B 4 O 7 , is demonstrated. The extracted dispersion curves are in a good agreement with the dispersion found by the search of poles in complex spectral domain.

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Section: Derivation Of Rational Approximation Of Admittancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3E-1 Fast Numerical Technique for Simulation of SAW Dispersion in Periodic Gratings and its Application to Some SAW Materials

Naumenko

Abbott²

2007

2007 IEEE Ultrasonics Symposium Proceedings

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“…It is worthwhile noting that the attenuation of the IAW is explicitly taken into account and estimated; we are thus able to identify and characterize leaky IAWs. Second, the harmonic admittance at an interface is derived from the interface effective permittivity in much the same way the harmonic admittance at a surface is based on the (surface) effective permittivity in the celebrated Blötekjaer method [13], [14]. The harmonic admittance is used to model propagation in case an infinite periodic interdigital transducer is located at the interface.…”

Section: Introductionmentioning

confidence: 99%

Interface acoustic waves properties in some common crystal cuts

Camou

Laude

Pastureaud

et al. 2003

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Interface acoustic waves (IAWs), also termed boundary waves, propagate at the interface between two solids. We present two IAW numerical analysis tools, inspired from well established surface acoustic wave (SAW) methods. First, the interface effective permittivity is derived for arbitrary piezoelectric solids and is used to estimate some basic parameters of IAWs. The harmonic admittance for an interface excitation is then derived from the interface effective permittivity, in much the same way the harmonic admittance for surface excitation is obtained from the (surface) effective permittivity. The finite electrode thickness is neglected in this problem analysis. The harmonic admittance is used to model propagation in case an infinite periodic interdigital transducer is located at the interface. Simulation results are commented upon for some usual piezoelectric material cuts and outline a modal selection specific to IAWs as compared with SAWs. The temperature dependence of the resonance frequency is also estimated.

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“…An analytic formula for the charge distribution (and therefore the capacitance) of fingers driven with alternating polarity [2] for periodic transducers can be found in [3]. This approximation may be used for the analysis of withdrawal-weighted transducers with periodic finger geometry.…”

Section: Capacitance Of Unapodized Idtmentioning

confidence: 99%

“…The passband slopes of ing of low-loss devices critically depend on the value of the IDTs operational capacitance. However, capacitances calculated by methods based on the infinite-array approximation [2] [3] often disagree with the measured values. They ignore parasitic capacitances (e.g.…”

Section: Introductionmentioning

confidence: 99%

Accurate computation of apodized SAW transducer capacitances

Manner

Ganss-Puchstein²

IEEE 1988 Ultrasonics Symposium Proceedings.

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The passband slope of a SAW filter with lar e fractional bandwidth critically depends on the value of t f e operating capacitances of the input and output interdigital transducer (IDT). To reduce the number of design cycles required to achieve a flat passband response, a program for the computation of all relevant contributions to the IDT capacitance was developed. For the analysis of the apodized transducer, a track division approach is employed. The capacitance contributions from the different tracks are computed by means of an interfinger nodal capacitance matrix. As this matrix is calculated from the Green's function of the boundary value problem, the presence of the grounded back-plane and any non-conductive adhesive is automatically taken into account. The operating capacitances of two different SAW filters with center frequencies of 70 MHz and 140 MHz fabricated on YZ -LiNbOs were caltulated and compared to measurements. The dependency of the capacitances on the thickness of a non-conductive adhesive is also shown. Even small variations in adhesive thickness cause noticeable changes in the transducer capacitances.

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Acoustic surface waves in piezoelectric materials with periodic metal strips on the surface

Cited by 94 publications

References 15 publications

3E-1 Fast Numerical Technique for Simulation of SAW Dispersion in Periodic Gratings and its Application to Some SAW Materials

3E-1 Fast Numerical Technique for Simulation of SAW Dispersion in Periodic Gratings and its Application to Some SAW Materials

Interface acoustic waves properties in some common crystal cuts

Accurate computation of apodized SAW transducer capacitances

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