Patent ID: 7394330
Filing Date: 2008-07-01
Classification: H01P

Abstract:
1. A non-reciprocal circuit element comprising a magnetic rotor, a permanent magnet and a casing, wherein: said magnetic rotor includes a soft ferrite substrate and a plurality of central conductors, and is provided inside said casing; said permanent magnet is provided inside said casing and disposed to overlap said magnetic rotor, so as to apply a DC magnetic field to said magnetic rotor; said casing includes a magnetic metal material, and is coupled with said permanent magnet so as to form a yoke; a coupling portion is formed in a direction crossing a magnetic circuit of said yoke so that said casing is coupled with said permanent magnet in a direction of said magnetic circuit through said coupling portion; and said coupling portion includes a capacitance element which has high impedance in response to a DC current and has low impedance in response to a high frequency current; wherein said capacitance element includes a single-plate capacitor.