PULSE COMPRESSION FILTER OF DISPERSION DELAY LINE TYPE

摘要

A pulse compression filter designed as a dispersive delay line functions with acoustic waves having a mean wavelength lambda o in the filter. At least one input/output transducer or at least one reflector arrangement is provided with a plurality of electrode respectively reflector fingers distributed on a substrate in accordance with a prescribed transfer function which has a given bandwidth and whose Fourier transform has a given time duration T. Said fingers are divided into a plurality of N finger groups designed identical to one another with respect to the number fingers n and corresponding finger spacings of corresponding fingers. Each finger group has a length in a propagation direction of the acoustic wave in the filter which is at least equal to the mean wavelength lambda o. Center spacings of adjacent finger groups from one another are non-equidistant in accordance with the prescribed transfer function. The plurality N of the finger groups is greater than the time bandwidth duration product (TxB).