Two-port isolator and method for evaluating it

Details Two-port isolator and method for evaluating it Two-port isolator and method for evaluating it

2005-09-06

2005-09-06

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Coupling networks

Nonreciprocal gyromagnetic type

C333S001100

Reexamination Certificate

active

06940360

ABSTRACT:
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.

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Shigeru Takeda, et al., “Improved Lumped-Element Two-Port Isolator,” 2003 IEEE MTT-S Digest, pp. 417-420.
Shigeru Takeda, “Off-Band Characteristics of Small Isolator for Portable Phones,” 1999 IEEE MTT-S Digest, pp. 1361-1364.
European Search Report, Oct. 27, 2003.

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