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AssigneeHitchi Metals, Ltd.
InventorsShigeru Takeda, Hideto Horiguchi, Yukinori Arita, Shinichirou Takeuchi, Yasushi Kishimoto, Shinji Yamamoto
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A two-port isolator comprising a thin ferrite plate, a permanent magnet for applying a static magnetic field to the thin ferrite plate, first and second central conductors disposed substantially in a center portion of the thin ferrite plate and crossing each other with electric insulation, first and second input-output terminals each connected to an end of each of the first and second central conductors, a common terminal connected to the other ends of the first and second central conductors, a first matching capacitor connected between the first input-output terminal and the common terminal, a second matching capacitor connected between the second input-output terminal and the common terminal, and a resistor connected between the first input-output terminal and the second input-output terminal, wherein the DC resistance of the resistor is set, such that with loss in a high-frequency signal entering into the first input-output terminal and exiting from the second input-output terminal defined as insertion loss, and with loss in a high-frequency signal entering into the second input-output terminal and exiting from the first input-output terminal defined as isolation loss, the insertion loss is smaller than the isolation, and that the isolation loss increases as a static magnetic field applied to the two-terminal isolator from outside increases.
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 wit 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 the DC resistance of said resistor is set, such that with loss in a high-frequency signal entering into said first input-output terminal and exiting from said second input-output terminal defined as insertion loss, and with loss in a high-frequency signal entering into said second input-output terminal and exiting from said first input-output terminal defined as isolation loss, said insertion loss is smaller than said isolation loss, and that said isolation loss increases as a static magnetic field applied to said two-port isolator from outside increases.
A method for evaluating 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 in a casing, said method comprising connecting said two-port isolator to an outside circuit;
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 said thin ferrite plate is constituted by one or more thin ferrite plate pieces, at least one thin ferrite plate piece being provided with a groove for receiving part of said central conductor.
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 said thin ferrite plate is in a rectangular shape, and wherein said first and second central conductors each having three or more conductor portions are disposed on said rectangular, thin ferrite plate in parallel with its side.
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°.
Dependencies are inferred from the claim text.