Surface Acoustic Wave Filters by David Morgan

By David Morgan

This publication provides the elemental rules and gadget layout strategies for floor acoustic wave filters. It covers the units in common use this day: bandpass and pulse compression filters, correlators and non-linear convolvers and resonators. the most recent applied sciences for low bandpass filters are absolutely coated similar to unidirectional transducers, resonators in impedance aspect filters, resonators in double-mode floor acoustic wave filters and transverse-coupled resonators utilizing waveguides. The booklet covers the speculation of acoustic wave physics, the piezoelectric impression, electrostatics at a floor, potent permittivity, piezoelectric observed excitation and reception, and the observed aspect issue. those are the most necessities for constructing quasi-static idea, which provides a foundation for the non-reflective transducers in transversal bandpass filters and interdigital pulse compression filters. it's also wanted for the reflective transducers utilized in the more moderen units. * a radical revision of a vintage on floor acoustic wave filters first released in 1985 and nonetheless in print* Uniquely combines effortless -to -understand rules with functional layout thoughts for the entire units in frequent use at the present time* whole assurance of the entire most modern units that are key to cellphones, TVs and radar platforms* features a new foreword by means of Sir Eric Albert Ash

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Extra resources for Surface Acoustic Wave Filters

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D. Royer and E. Dieulesaint. Elastic Waves in Solids, Vols. 1 and 2, Springer, 2000. H. ), Surface Wave Filters, Wiley, 1977. A. ), Acoustic Surface Waves, Springer, 1978. P. Morgan. Surface-Wave Devices for Signal Processing, Elsevier, 1985, 1991. S. Datta. Surface Acoustic Wave Devices, Prentice-Hall, 1986. M. Feldmann and J. Henaff. Surface Acoustic Waves for Signal Processing, Artech House, 1989. V. V. V. P. Plessky. Surface Acoustic Waves in Inhomogenous Media, Springer, 1995. K. Campbell.

The short-circuit current produced by the receiver is given by eq. 6), so the ratio of output current to input voltage is Isc /V = HtL (ω)HtR (ω) exp(−jkd). 7) Thus, the device response is simply the product of the transducer responses, with a linear phase change due to the transducer separation. The triple-transit signal is absent from this equation because we have assumed the transducers to be non-reflective. This implies that they do not reflect when shorted or connected to a zero-impedance source.

1, 393–396 (2003). 2 ACOUSTIC WAVES IN ELASTIC SOLIDS Many different types of acoustic waves can propagate in solid materials, and here we are particularly concerned with surface waves. A brief account of the analysis and properties of the waves is presented, including waves in piezoelectric materials since these are used in practical devices. More detail is given in other sources [1–4]. The basic nature of the waves is essential to an understanding of the devices. Although the devices make use of piezoelectric materials, many of the waves in such materials have counterparts in isotropic materials, which are non-piezoelectric.

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