Diffraction and Beam Steering for Surface-Wave Comb Structures on Anisotropic Substrates

Abstract

Abstract : It has been shown that agreement can be obtained between experimental and calculated diffraction patterns over a frequency range extending from 107-905 MHz for propagation directions having very high phase-velocity anisotropy. One may therefore conclude that the angular spectrum of straight-crested surface waves offers a valid means of solving surface-wave diffraction problems for homogeneous anisotropic crystals. It has also been demonstrated that beam steering is inherent in the diffraction process itself and that calculations for diffraction losses may be undertaken for delay lines that are oriented either along pure-mode axes or with various types of misorientation, the only major requirement being that the surface-wave phase velocities be known for that particular crystal cut. (Author)