Surface acoustic wave arrangement for broadband signal transmission

[0045]FIG. 1A shows a known surface acoustic wave arrangement SAW having two interdigital transducers W1 and W2 formed as fan transducers on a portion of a piezoelectric substrate PS. The electrode fingers are arranged on a periodic grid, the period of the grid and, thus, the absolute finger center distances decrease in the selected transverse direction, which is illustrated as in the upward direction. The electrode fingers taper in this direction so that the finger widths measured in wavelengths or rather the finger center distances measured in wavelengths remains constant, but the wavelength decreases with decreasing absolute finger center distances.

[0046]The transducer arrangement shown in FIG. 1A is also known as a dual-focus arrangement, since the electrode fingers of the two transducers W1 and W2 lengthened in the transverse direction converge in each case at a point or focus point.

[0047]In FIG. 1B, another known arrangement SAW′ is a single focused arrangement of two fan transdu