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The interdigital transducer and its response in the case of the impact of the inhomogeneous surface acoustic wave DOI:10.12915/pe.2014.06.035

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In the paper, the influence of the inhomogeneous surface acoustic wave and the tilt and shift of output interdigital transducer on the transmitted power coefficient and efficiency, is analyzed. Streszczenie: W artykule przedstawiono wpływ nierówności rozchodzenia sie fali akusticznej i obwodu wyjściowego przetwornika na moc transmisyjną oraz sprawność. Wpływ nierówności rozchodzenia sie fali akusticznej i obwodu wyjściowego przetwornika na moc transmisyjną oraz sprawność Keywords: interdigital transducers, surface acoustic wave, power transmission coefficient, the efficiency of shifted and slanted transducer. Slowa kluczowe: przetwornik interdigital, powierzchniowe fale akustyczne, współczynnik transmisji mocy doi:10.12915/pe.2014.06.35 Introduction Normally we assume idealized conditions when designing the surface acoustic wave (SAW) filter. These are: acoustic beam radiated by the input IDT has a constant amplitude and phase across of the beam, the amplitude of SAW drops sharply at the edges of the beam and it has a zero value outside of the beam, the beam width is equal to the aperture of the transducer, the output beam exactly overlaps the beam and the electrodes of the transducer are parallel to the wave front. In reality, these conditions are not always met, because the incident SAW is generally inhomogeneous and inhomogeneity of the waves can be caused by apodization of input transducer or low number of electrodes. Due to design inaccuracies, the output IDT can be shifted and tilted due to the input IDT and the electrodes are not parallel to the wave front. At the same time, diffraction of acoustic beam causes a change in amplitude and phase of SAW across the beam, the beam extends and causes the radiation of energy to the outside of the output IDT. Those phenomena have the effect of additional insertion loss. This article is aimed to contribute to derive the mathematical relations and to present the experimental resu[...]

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