Patent ID: 7866028

Claim:
A method for manufacturing a resonant element including a substrate made of a dielectric material, a ground electrode formed on a rear principal surface side of the substrate, principal-surface electrodes formed on a front principal surface of the substrate and that define resonators together with the ground electrode and the dielectric material, an electrode protecting layer formed on substantially entire surfaces on a front principal surface side of the substrate and the principal-surface electrodes, and a coupling adjusting electrode that is formed on a front principal surface side of the electrode protecting layer and that has both ends facing the principal-surface electrodes of two of the resonators, the method comprising in order: a setting step of setting a shape of the coupling adjusting electrode in each manufactured lot; and a forming step of forming the coupling adjusting electrode having the shape set in the setting step in each manufactured lot on the front principal surface side of the substrate and the electrode protecting layer sintered in advance, and baking the coupling adjusting electrode to the electrode protecting layer.