Patent ID: 6894578
Filing Date: 2005-05-17
Classification: H01P

Abstract:
1. A non-reciprocal circuit module comprising (a) a permanent magnet for applying a DC magnetic field to a magnetic body, (b) an assembly comprising a plurality of central conductors and said magnetic body placed therein, each of said central conductors having a common terminal at one end and an input/output terminal for a high-frequency signal at the other end, (c) a laminate constituted by a plurality of dielectric layers having conductor layers comprising electrode patterns, ground electrodes, and line electrodes, (d) said laminate comprising a plurality of load capacitors connected to said central conductors, a first transmission line and a second transmission line magnetically coupled to said first transmission line to constitute a directional coupler, said load capacitors being formed by conductor layers (electrode patterns) opposing via said dielectric layers, said first and second transmission lines being formed by conductor layers (line electrodes) sandwiched by conductor layers (ground electrodes), through-hole electrodes being provided on dielectric layers on which one of said conductor electrodes (ground electrodes) is formed, and said first transmission line being connected to one of said central conductors on an upper surface of said laminate via said through-hole electrodes.