Patent ID: 6486752
Filing Date: 2002-11-26
Classification: H03H

Abstract:
A surface acoustic wave filter pattern achieved by connecting surface acoustic wave resonators, each having tooth comb-type cross electrodes provided over a plurality of levels and reflectors, in a ladder pattern,each said resonator including an inter-digital transducer with a common center electrode having first and second groups of comb-like teeth extending in opposite directions along a surface of a chip, first and second comb-type electrodes on said surface whose comb teeth extend respectively between the teeth of the first and second groups of teeth, and a pair of conductive reflector patterns disposed on said surface at each end of said transducer adjacent the respective first and second comb-type electrodes; connection patterns connecting and grounding all conductive patterns on the surface of the chip via dicing lines, on said chip surface, with each common electrode being connected to a dicing line via a respective connection line extending between two reflector patterns of a said pair of reflector patterns for the respective resonator; a series connected resonator of the ladder pattern has one of its first and second electrodes connected to an input signal terminal or an output signal terminal, and the other of its first and second electrodes connected to one of said first and second electrodes of a parallel connected resonator; and, a parallel connected resonator of the ladder pattern has one of its first and second electrodes connected to one of the first and second electrodes of a series connected resonator and the other of its first and second electrodes connected to ground.