An Analysis of Excitation Characteristics of Interdigital Transducers for Surface Acoustic Waves

Koshiba, Masanori; Hasegawa, Koji; Inagawa, Kiyoshi

doi:10.7567/jjaps.28s1.105

Cited by 7 publications

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“…The substrate region and the vacuum region are divided with one superelement (with M = 2N spatial harmonics). The parameters in the mode-coupled equations are computed by the method proposed by the authors [14].…”

Section: Numerical Examplesmentioning

confidence: 99%

“…They have carried out an analysis of a FEUDT on a 128° YX LiNbO 3 substrate and have demonstrated its validity by a comparison with experimental data [14]. In this method, various parameters in the mode-coupled equations are computed from the upper and lower limit frequencies and the potential standing wave distributions of the stopband of the grating reflectors with an infinitely long SPUDT feed line both shorted and open.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Finite‐Element Analysis of Surface Acoustic Waveguides with One‐Wavelength Period along Propagation Direction

Hasegawa

Koshiba

2002

Electron Comm Jpn Pt II

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SUMMARYThe finite-element analysis method based on the hybrid variational principle is proposed for analysis of the dispersion characteristic of periodic surface acoustic waveguides with a one-wavelength period. A new formulation is used for finite element approximation applied to the periodic function part of Floquet modes. This approach allows elimination of the uniform field without sinusoidal variations in the periodic direction, which has been included in the conventional hybrid finite-element analysis to directly approximate the entire field distribution. Hence, an analysis of periodic waveguide structures with a one-wavelength period is now possible. Specifically, the reflection properties are studied for a metallic grating reflector with a one-wavelength period formed on an X-112°Y LiTaO 3 substrate and for a DART and an EWC-SPUDT.

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Section: Numerical Examplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Finite‐Element Analysis of Surface Acoustic Waveguides with One‐Wavelength Period along Propagation Direction

Hasegawa

Koshiba

2002

Electron Comm Jpn Pt II

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A solution method based on the coupled‐mode theory for natural single‐phase unidirectional surface acoustic wave transducers

Hasegawa

Inagawa

Koshiba

1994

Electron Comm Jpn Pt II

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A method for analysis of natural single‐phase unidirectional transducer (NSPUDT), which is one of unidirectional surface acoustic wave interdigital electrodes, is proposed in which the mode coupling theory and the finite‐element method are used. the finite‐element method is used for calculations of the upper and lower limit frequencies of the stop band, the potential standing wave distribution at these frequencies, and the static capacitance per electrode pair for the short and open gratings corresponding to the electric terminals either shorted or open. In the substrate used for NSPUDT, the locations of the maximum and minimum of the standing wave in general vary in the depth direction of the substrate. Hence, it is not possible to use the standing wave pattern in the substrate as is used for a substrate surface where electrodes are present. the variation of the potential in the depth directional of the substrate is incorporated into the mode coupling theory in this research, so that the depth dependence of the standing wave profile is qualitatively evaluated. Hence, it is made possible to confirm the locations of the maximum and minimum of the standing wave at the substrate surface from the standing wave profile in the substrate. Specifically, the present method is applied to NSPUDT on an ST‐cut 25deg; X‐propagation quartz substrate so that its validity and usefulness are confirmed.

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Small love‐wave SAW resonators with very low capacitance ratio

Shimizu

Suzuki

1992

Electron Comm Jpn Pt III

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When a strip grating of periodic strips of Au, Ag, or Pt is produced on a rotated Y‐cut LiNbO3, a Love‐type surface wave with a high coupling (K2 > 30 percent) is formed and the reflection coefficient per strip is as large as several tens percent. In this paper, a small IDT resonator, with an extremely low capacitance ratio making use of the Love‐type surface wave, is studied theoretically and experimentally. First, the admittance characteristics of the IDT are studied by means of the mode‐coupling equation, which is determined by the dispersion characteristics derived from the Floquet theorem. It can be shown that the IDT exhibits resonant characteristics and the capacitance ratio is 2.4 – 2.7 if the number of pairs is more than 10. Next, an experiment was carried out by using a combination of the Y‐X LiNbO3 substrate and the Au electrodes. It is demonstrated that the resonator with a low‐capacitance ratio can be realized, as predicted by the theory. Further, rhombically weighted electrodes are proposed. It is confirmed that the spurious transverse mode and the spurious longitudinal mode can be suppressed simultaneously.

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An Analysis of Excitation Characteristics of Interdigital Transducers for Surface Acoustic Waves

Cited by 7 publications

References 0 publications

Hybrid Finite‐Element Analysis of Surface Acoustic Waveguides with One‐Wavelength Period along Propagation Direction

Hybrid Finite‐Element Analysis of Surface Acoustic Waveguides with One‐Wavelength Period along Propagation Direction

A solution method based on the coupled‐mode theory for natural single‐phase unidirectional surface acoustic wave transducers

Small love‐wave SAW resonators with very low capacitance ratio

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