Patent ID: 7209362

Claim:
A multilayer ceramic substrate with a cavity comprising: a multilayer composite member including a plurality of ceramic layers disposed one on another; a cavity formed in the multilayer composite member such that an opening of the cavity is located in at least one principal surface of the multilayer composite member; a bottom-surface conductive film connected to a ground potential, the bottom-surface conductive film being disposed on a bottom surface of the cavity; a plurality of conductive films disposed in the multilayer composite member; and an electronic component electrically connected to the bottom-surface conductive film, the electronic component being disposed in the cavity; among the plurality of conductive films, the conductive film which is disposed closest to the bottom-surface conductive film is arranged in the multilayer composite member so as to define a capacitor conductive film which faces the bottom-surface conductive film via at least one of the plurality of ceramic layers to produce a capacitance, the capacitor conductive film being arranged such that a space between the bottom-surface conductive film and the capacitor conductive film is smaller than a space between all of the other conductive films of the plurality of conductive films and the capacitor conductive film; and an area of the capacitor conductive film is smaller than an area of the bottom-surface conductive film, and the capacitor conductive film is symmetrically arranged with respect to a center of the electronic component disposed in the cavity, where the center is defined in a bottom surface direction of the cavity.