Nonreciprocal circuit element and transceiver device

Patent metadata

Field	Value
Publication number	US-9419320-B2
Application number	US-201414307579-A
Country	US
Kind code	B2
Filing date	Jun 18, 2014
Priority date	Dec 20, 2011
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A nonreciprocal circuit element is configured so that a first center electrode and a second center electrode are arranged on a ferrite, to which a direct current magnetic field generated by a permanent magnet is applied, so as to cross each other and be insulated from each other. One end portion of the first center electrode is connected to a first unbalanced input/output port and one port of a plurality of balanced input/output ports and the other end portion of the first center electrode is connected to ground. One end portion of the second center electrode is connected to a second unbalanced input/output port and the other port of the balanced input/output ports and the other end of the second center electrode is connected to the ground. The one end portion of the first center electrode is connected to the ground via a first capacitor element, and the one end portion of the second center electrode is connected to the ground via a second capacitor element.

First claim

What is claimed is:

1. A nonreciprocal circuit element comprising:
a ferrite; and
a first center electrode and a second center electrode arranged on the ferrite so as to cross each other and be insulated from each other, and to which a direct current magnetic field generated by the permanent magnet is applied; wherein
one end portion of the first center electrode is connected to one of a plurality of balanced input/output ports and a first unbalanced input/output port and another end portion of the first center electrode is connected to ground;
one end portion of the second center electrode is connected to another port of the plurality of balanced input/output ports and a second unbalanced input/output port and another end portion of the second center electrode is connected to the ground;
the one end portion of the first center electrode is connected to the ground via a first capacitor element; and
the one end portion of the second center electrode is connected to the ground via a second capacitor element.

2. The nonreciprocal circuit element according to claim 1 , wherein the non-reciprocal circuit element has a fractional bandwidth of about 30%.

3. The nonreciprocal circuit element according to claim 1 , wherein the non-reciprocal circuit element is a lumped-constant equivalent circuit.

4. The nonreciprocal circuit element according to claim 1 , wherein the non-reciprocal circuit element is an antenna duplexer.

5. A transceiver device comprising:
a nonreciprocal circuit element;
an antenna;
a receiver side port; and
a transmitter side port; wherein
the nonreciprocal circuit element includes:
a ferrite; and
a first center electrode and a second center electrode arranged on the ferrite so as to cross each other and be insulated from each other, and to which a direct current magnetic field generated by the permanent magnet is applied; wherein
one end portion of the first center electrode is connected to one of a plurality of balanced input/output ports and a first unbalanced input/output port and another end portion of the first center electrode is connected to ground;
one end portion of the second center electrode is connected to another port of the plurality of balanced input/output ports and a second unbalanced input/output port and another end portion of the second center electrode is connected to the ground;
the one end portion of the first center electrode is connected to the ground via a first capacitor element;
the one end portion of the second center electrode is connected to the ground via a second capacitor element; and
the first unbalanced input/output port is connected to the transmitter side port;
the balanced input/output port is connected to the antenna; and
the second unbalanced input/output port is connected to the receiver side port.

6. The transceiver device according to claim 5 , wherein the non-reciprocal circuit element has a fractional bandwidth of about 30%.

7. The transceiver device according to claim 5 , wherein the non-reciprocal circuit element is a lumped-constant equivalent circuit.

8. The transceiver device according to claim 5 , wherein the non-reciprocal circuit element is an antenna duplexer.

9. The transceiver device according to claim 5 , wherein the transceiver device is a cellular phone.

10. A nonreciprocal circuit element comprising:
a ferrite; and
a first center electrode and a second center electrode arranged on the ferrite so as to cross each other and be insulated from each other, and to which a direct current magnetic field generated by the permanent magnet is applied; wherein
one end portion of the first center electrode is connected to one of a plurality of balanced input/output ports and a first unbalanced input/output port;
one end portion of the second center electrode is connected to another end portion of the first center electrode and another port of the plurality of balanced input/output ports as well as a second unbalanced input/output port and another end portion of the second center electrode is connected to the ground;
a first capacitor element is connected between the balanced input/output ports in parallel to the first center electrode; and
the one end portion of the second center electrode is connected to the ground via a second capacitor element.

11. The nonreciprocal circuit element according to claim 10 , wherein the non-reciprocal circuit element has a fractional bandwidth of about 30%.

12. The nonreciprocal circuit element according to claim 10 , wherein the non-reciprocal circuit element is a lumped-constant equivalent circuit.

13. The nonreciprocal circuit element according to claim 10 , wherein the non-reciprocal circuit element is an antenna duplexer.

14. A transceiver device comprising:
a nonreciprocal circuit element;
an antenna;
a receiver side port; and
a transmitter side port; wherein
the nonreciprocal circuit element includes:
a ferrite; and
a first center electrode and a second center electrode arranged on the ferrite so as to cross each other and be insulated from each other, and to which a direct current magnetic field generated by the permanent magnet is applied; wherein
one end portion of the first center electrode is connected to one of plurality of balanced input/output ports and a first unbalanced input/output port;
one end portion of the second center electrode is connected to another end portion of the first center electrode and another port of the plurality of balanced input/output ports as well as a second unbalanced input/output port and another end portion of the second center electrode is connected to the ground;
a first capacitor element is connected between the balanced input/output ports in parallel to the first center electrode;
the one end portion of the second center electrode is connected to the ground via a second capacitor element;
the first unbalanced input/output port is connected to the antenna;
the balanced input/output port is connected to the receiver side port; and
the second unbalanced input/output port is connected to the transmitter side port.

15. The transceiver device according to claim 14 , wherein the non-reciprocal circuit element has a fractional bandwidth of about 30%.

16. The transceiver device according to claim 14 , wherein the non-reciprocal circuit element is a lumped-constant equivalent circuit.

17. The transceiver device according to claim 14 , wherein the non-reciprocal circuit element is an antenna duplexer.

18. The transceiver device according to claim 14 , wherein the transceiver device is a cellular phone.

19. A transceiver device comprising:
a nonreciprocal circuit element;
an antenna;
a receiver side port; and
a transmitter side port; wherein
the nonreciprocal circuit element includes:
a ferrite; and
a first center electrode and a second center electrode arranged on the ferrite so as to cross each other and be insulated from each other, and to which a direct current magnetic field generated by the permanent magnet is applied; wherein
one end portion of the first center electrode is connected to one of a plurality of balanced input/output ports and a first unbalanced input/output port;
one end portion of the second center electrode is connected to another end portion of the first center electrode and another port of the plurality of balanced input/output ports as well as a second unbalanced input/output port and another end portion of the second center electrode is connected to the ground;
a first capacitor element is connected between the

Assignees

• Murata Manufacturing Co

Inventors

• Hasegawa Takashi

Classifications

• H04B1/44

  Transmit/receive switching · CPC title

• H01P1/38 Primary

  Circulators · CPC title

• H04B1/52

  Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa · CPC title

• H01P1/387 Primary

  Strip line circulators · CPC title