Acoustic surface waves

Acoustic surface waves are discussed with reference to their properties (plate modes, anisotropy, piezoelectricity, propagation, reflection, and diffraction) and the principles of surface-wave filter design (equivalent circuit model, transducer performance). The fundamentals of signal processing devices are reviewed including delay lines, acoustic surface wave resonators, coded time-domain structures, nonlinear signal processing, and multiport acoustic devices. Various waveguides for surface waves are considered, noting flat-overlay waveguides, topographic waveguides, in-diffused waveguides, rectangular-overlay waveguides, and circular-fiber waveguides. Laser probe measurements are evaluated and propagation losses are identified. Attention is given to diffraction and beam steering, coupling efficiency and temperature coefficients, and nonlinear effects. Fabrication techniques for surface-wave devices are presented.