Non-reciprocal element with three central conductors and communication apparatus using the same

• US 20050083146A1
• Filed: 10/20/2004
• Published: 04/21/2005
• Est. Priority Date: 10/20/2003
• Status: Active Grant

• Current Assignee: Hitachi Metals (Thailand) Ltd.
• Original Assignee: Hitachi Metals (Thailand) Ltd.
• Inventors: Ichikawa, Koji, Takeda, Shigeru, Mikami, Hideto
• Granted Patent: US 7,365,616 B2
• Time in Patent Office: Days
• US Class Current: 333/1.100
• CPC Class Codes: H01P 1/387 Strip line circulators

Abstract

A non-reciprocal element with three central conductors and a communication apparatus are disclosed, in which the insertion loss is small and the bandwidth is wide. Three central conductors are arranged in proximity to a ferrite thin plate in such a manner as to cross each other in a mutually electrically insulated state. A static magnetic field is applied to the ferrite thin plate by a permanent magnet. An end each of the three central conductors makes up three input/output terminals, respectively, and the other end thereof is connected to a common portion. Three matching capacitors are connected between an end each of the three input/output terminals, respectively, and the common portion. At least one of the angle between the first and second central conductors and the angle between the second and third central conductors is not more than 90 degrees.

Claims

1. A non-reciprocal element with three central conductors, comprising:

a ferrite thin plate with a static magnetic field being applied by a permanent magnet; and

first, second and third central conductors arranged in proximity to the ferrite thin plate, to cross each other in an electrically insulated state;

wherein an end each of the first, second and third central conductors constitutes first, second and third input/output terminals, respectively, and the other end thereof is connected to a common portion;

wherein first, second and third matching capacitors are inserted between the first, second and third input/output terminals, respectively, and the common portion; and

wherein at least one of the angle φ

between the first and second central conductors and the angle θ

between the second and third central conductors is not more than 90 degrees.

2. A non-reciprocal element with three central conductors according to claim 1,

wherein the angle φ

between the first and second central conductors is about 60 degrees and the angle θ

between the second and third central conductors is about 60 degrees.

3. A non-reciprocal element with three central conductors according to claim 1,

wherein a resistor is inserted between selected one of the first and third input/output terminals and the common portion.

4. A non-reciprocal element with three central conductors according to claim 2,

wherein a resistor is inserted between selected one of the first and third input/output terminals and the common portion.

5. A non-reciprocal element with three central conductors according to claim 1,

wherein a resistor is inserted between selected one of the first, second and third input/output terminals and the common portion, one of the remaining two input/output terminals constitutes an input terminal while the other remaining input/output terminal constitutes an output terminal, the central conductor constituting the input terminal and the central conductor constituting the output terminal are arranged adjacently to each other at an angle of not more than 90 degrees with each other.

6. A non-reciprocal element with three central conductors according to claim 5,

wherein the angle between the central conductor constituting the input terminal and the central conductor constituting the output terminal is about 60 degrees.

7. A non-reciprocal element with three central conductors according to claim 1,

wherein a resistor is inserted between the second input/output terminal and the common portion.

8. A non-reciprocal element with three central conductors according to claim 2,

wherein a resistor is inserted between the second input/output terminal and the common portion.

9. A non-reciprocal element with three central conductors according to claim 1,

wherein the input/output terminals of an end each of the first, second and third central conductors, respectively, are juxtaposed laterally along one side of the ferrite thin plate.

10. A non-reciprocal element with three central conductors according to claim 2,

wherein the input/output terminals of an end each of the first, second and third central conductors, respectively, are juxtaposed laterally along one side of the ferrite thin plate.

11. A non-reciprocal element with three central conductors according to claim 1,

wherein the central portion of at least one of the first, second and third central conductors is divided into at least three conductor lines.

12. A non-reciprocal element with three central conductors according to claim 2,

wherein the central portion of at least one of the first, second and third central conductors is divided into at least three conductor lines.

13. A non-reciprocal element with three central conductors according to claim 1,

wherein said common portion is a ground conductor.

14. A non-reciprocal element with three central conductors according to claim 2,

wherein said common portion is a ground conductor.

15. A communication apparatus comprising at least a non-reciprocal element with three central conductors according to claim 1.