Abstract: In a duplexer for a wireless communication system that comprises a transmission and a reception band, the present invention provides that a split surface wave filter be provided as an input and/or output filter, this split surface wave filter comprising at least two sub-filters that cover neighboring frequency sub-ranges of the corresponding band and supplementing one another to the overall band. At least two pairs of sub-filters are provided that respectively comprise a filter in the input and output filter. Switching between the at least two pairs can be carried out with a switch. Given the same duplexer spacing, a higher band spacing that can be realized with SAW filters is created between transmission and reception band or the corresponding frequency sub-ranges.

Abstract: In a duplexer for a wireless communication system that comprises a transmission and a reception band, it is proposed that a split surface wave filter be provided as input and/or output filter, said slit surface wave filter being composed of at least two sub-filters that cover neighboring frequency sub-ranges of the corresponding band and supplementing one another to the overall band. At least two pairs of sub-filters are provided that respectively comprise a filter in the input and out put filter. Switching between the at least two pairs can be carried out with a switch. Given the same duplexer spacing, a higher band spacing that can be realized with SAW filters is created between transmission and reception band or, respectively, the corresponding frequency sub-ranges.

Abstract: The electronic component, specifically a SAW component with conductive structures disposed on a substrate is encapsulated for protection against environmental influences. The electrically conductive structures are sealed with a gas diffusion-constricting protective layer formed with an electrochemical or ion bombardment process.

Abstract: The surface acoustic wave (SAW) filter has two or more identical acoustic tracks. The input side of the tracks is electrically connected in parallel and the output side is electrically connected in series, whereby the impedance of input side of the SAW filter is reduced relative to the impedance of the individual acoustic tracks.

Abstract: A surface acoustic wave filter has one or more acoustic filter tracks. Each track has an input interdigital converter, an output interdigital converter, and a reflector. The reflector reflects surface waves between the input and output inter-digital converter by 180.degree.. The reflector is formed with a multiplicity of reflector electrode fingers which are combined into reflector finger groups. Mutually adjacent reflector finger groups are spaced apart by a defined spacing distance such that respective signals in adjacent reflector finger groups are superimposed in antiphase.

Abstract: An interdigital converter of a surface acoustic wave filter is internally protected against electrostatic discharges. The protection is provided by a resistor which is connected in parallel to the interdigital converter.

Abstract: A filter operating with acoustical surface waves includes two acoustical paths each having one unidirectional input transducer, one unidirectional output transducer, and a reflector structure disposed between the input and output transducers. The input transducers in the acoustical paths are structurally identical, the output transducers in the acoustical paths are structurally identical, and the input and output transducers in each of the acoustical paths are spaced apart by the same distance. One of the input transducers or the output transducers are electrically connected in phase opposition, and the other of the input transducers or the output transducers are electrically connected in phase. The reflector structures in the two acoustical paths have substantially the same reflection performance, the reflector structure in one of the acoustical paths is shorter than the reflector structure in the other of the acoustical paths by .lambda.

Abstract: A weighted reflector which has relatively low sensitivity to production-dependent tolerances. The reflector is based on the principle of an open-short reflector which has length-weighted reflector strips.

Abstract: Magnetic head comprising two magnetic circuits (1, 1') attached to each other. Two parts (14, 14') made of non-magnetic material are located beneath the gap of the head. The magnetic poles 3, 3' are made with thin layers on the magnetic circuits (1, 1') and the parts made of non-magnetic material. The material for bonding the magnetic circuits sets up the gap (5) between the poles (3, 3').

Abstract: An interdigital transducer is weighted by means of finger-width weighting for surface wave arrangements. The weighting is produced by differing finger widths in conjunction with constant widths of finger gaps. Constant finger overlap length is preferably provided.

Abstract: A surface-wave filter in which the acoustic wavepath is reflected in order to reduce the substrate size necessary. The reflections are chosen so that interference due to temperature effects is excluded. The use of filters of this kind as partial filters in a combined filter enables cross-talk to be further reduced.

Abstract: 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.

Abstract: A magnetic head employs a gap of magnetic material between two poles. The magnetic material of the gap has a saturation value less than the saturation value of the poles. When the gap material is not saturated, the magnetic field remains contained within this gap.