Patent ID: 6940360
Filing Date: 2005-09-06
Classification: H01P

Abstract:
1. A two-port isolator comprising a thin ferrite plate, a permanent magnet for applying a static magnetic field to said thin ferrite plate, first and second central conductors disposed substantially in a center portion of said thin ferrite plate and crossing each other with electric insulation, first and second input-output terminals each connected to an end of each of said first and second central conductors, a common terminal connected to the other ends of said first and second central conductors, a first matching capacitor connected between said first input-output terminal and said common terminal, a second matching capacitor connected between said second input-output terminal and said common terminal, and a resistor connected between said first input-output terminal and said second input-output terminal, wherein a crossing angle (on the resistor side) of the center axis of said first central conductor and the center axis of said second central conductor is in a range of 40-80°, wherein a third capacitor is connected in parrallel with said resistor and said common terminal is connected to a ground, and wherein said third capacitor has smaller static capacitance than those of said first and second matching capacitors.