SURFACE ACOUSTIC WAVESAW FILTER OF THE REACTANCE FILTER TYPE EXHIBITING IMPROVED STOP BAND SUPPRESSION AND METHOD FOR OPTIMIZING THE STOP BAND SUPPRESSION

摘要

In a SAW filter of the reactance type having at least two SAW resonators in two parallel branches and a SAW resonator in a serial branch, the invention provides that an electrical connection fashioned on the substrate of the ground sides of the two SAW resonators in the parallel branches is done before the bonding to the housing in order to achieve a shift of the pole point belonging to the parallel branch to a lower frequency.