摘要:
Surface-wave arrangement (1) having at least one surface structure (21, 22), by means of which those components of surface waves (19) which are produced in the arrangement are rendered ineffective with respect to interference which would otherwise occur, for which a sump is provided in a known manner at the end of the substrate.
摘要:
A two track surface wave arrangement has improved selection property resulting from crosstalk signals of parasitic transmission paths within the arrangement being suppressed. What can be achieved with a displacement of the surface wave arrangement of one track relative to that of the other track by a dimension of nearly half a wavelength is that crosstalk signals mutually cancel on the basis of interference without affecting the useful signal.
摘要:
A surface wave reflection filter includes an input transducer, an output transducer, and a reflector in a first propagation track. To compensate for undesired surface waves proceeding directly between the input and output transducers, as opposed to the desired surface waves which are reflected before reaching the output transducer, a second propagation track is provided. The second track includes a input transducer and an output transducer, and is either connected in phase opposition to compensate for the undesired signal, or is constructed to generate a signal in phase opposition. A sump may be provided in the second track, a second reflector may be provided in the first track or in the second track, and the two tracks may be on separate or the same substrates.
摘要:
An in-line surface-wave reflector filter having an input/output transducer system (2, 12/4) in which direct acoustic signal transmission between input and output is eliminated.