Patent ID: 7432777
Filing Date: 2008-10-07
Classification: H01P

Abstract:
1. A non-reciprocal circuit element comprising: a permanent magnet; a ferrite member; and a plurality of center electrodes coupled at radio frequencies to the ferrite member to which a bias magnetic field is applied from the permanent magnet; wherein first to fifth center electrodes are provided on the ferrite member; the first and third center electrodes do not intersect each other, and the first and third center electrodes intersect the second, fourth, and fifth center electrodes with electrical insulation therebetween; connection is established so that a magnetic field generated when current flows from one end to the other end of the first center electrode and a magnetic field generated when current flows from one end to the other end of the third center electrode are in phase and in the same direction; connection is established so that a magnetic field generated when current flows from one end to the other end of the second center electrode, a magnetic field generated when current flows from one end to the other end of the fourth center electrode, and a magnetic field generated when current flows from one end to the other end of the fifth center electrode are in phase and in the same direction; a first matching capacitor and a first terminating resistor are connected in parallel to the first center electrode, a second matching capacitor is connected in parallel to the second center electrode, and a third matching capacitor and a second terminating resistor are connected in parallel to the third center electrode; and the one end of the first center electrode and the other end of the third center electrode define balanced input ports, and the one end of the fourth center electrode defines an unbalanced output port.