Patent ID: 6734754
Filing Date: 2004-05-11
Classification: H01P

Abstract:
A nonreciprocal circuit device comprising:a permanent magnet; a center electrode assembly that includes a ferrite element, to which a direct-current magnetic field is applied by the permanent magnet, and a plurality of center electrodes, arranged on a major surface of the ferrite element; a multilayer substrate that has a first major surface and a second major surface being opposed to the first major surface and that includes matching capacitor elements connected to corresponding ends of the center electrodes, wherein the center electrode assembly is arranged on the first major surface and a plurality of external-connection terminal electrodes is provided at the second major surface; and a metal casing that encloses the permanent magnet, the center electrode assembly, and the multilayer substrate; wherein the metal casing is partially provided on the second major surface of the multilayer substrate and at least one of the plurality of external-connection terminal electrodes protrudes from the second major surface by a distance that is substantially equal to a thickness of the metal casing.