Patent ID: 6255916
Filing Date: 2001-07-03
Classification: H03H

Abstract:
A resonator-type surface-acoustic wave (SAW) filter comprising:a plurality of SAW resonators connected in series and parallel with each other, each SAW resonator has a pair of terminals as well as reflectors having electrodes and an interdigital transducer having interdigital electrodes, wherein:in at least one of said SAW resonators connected in series with another of said SAW resonators, a pitch between adjoining electrodes, which is referred to as an inter-electrode pitch .lambda..sub.SREF in said reflectors is different from a pitch between adjoining interdigital electrodes, which is referred to as an inter-electrode pitch .lambda..sub.SIDT in said interdigital transducers; andin each of said SAW resonators connected in parallel, a pitch between adjoining electrodes in said reflectors is the same as a pitch between adjoining interdigital electrodes in said interdigital transducers.