Piezoelectric filter for radio or television receiver

摘要

The filter (1) has a piezoelectric substrate (2), with pairs of resonance electrodes (3a,3b ; 4a,4b) applied to one of its major surfaces (2a) and a common electrode for each resonance electrode pair applied to its opposite major surface. A coupling capacitance is provided by a pair of capacitance electrodes (5a) applied to the opposite surfaces of the substrate, at least one of these electrodes extending over the side edges of the substrate.