Non-reciprocal circuit element

Patent metadata

Field	Value
Publication number	US-9728831-B2
Application number	US-201615219680-A
Country	US
Kind code	B2
Filing date	Jul 26, 2016
Priority date	Jan 27, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Favorable isolation characteristics are obtained over a wide band in a non-reciprocal circuit element. A non-reciprocal circuit element includes: a magnetic material 10 to which a DC magnetic field is applied by a permanent magnet; and a plurality of center electrodes disposed on the magnetic material 10 so as to intersect each other in an insulated state. Of the plurality of center electrodes, a first center electrode 21 is connected at one end thereof to a first input/output port P 1 , and a second center electrode 22 is connected at one end thereof to a second input/output port P 2 . A resistance element R is connected in series between the ports P 1 and P 2 , and a phase-shift circuit (a parallel resonant circuit composed of an inductance element L 5 and a capacitance element C 5 ) is connected in series with the resistance element R.

First claim

The invention claimed is:

1. A non-reciprocal circuit element comprising:
a magnetic material to which a DC magnetic field is applied by a permanent magnet; and
a plurality of center electrodes disposed on the magnetic material so as to intersect each other in an insulated state and comprising a first center electrode and a second center electrode, wherein
one end of the first center electrode is connected to a first input/output port, and one end of the second center electrode is connected to a second input/output port, and
a resistance element is connected in series between the first input/output port and the second input/output port, and a phase-shift circuit is connected in series with the resistance element, wherein the phase-shift circuit is an LC parallel resonant circuit composed of an inductance element and a capacitance element.

2. The non-reciprocal circuit element according to claim 1 , wherein an additional capacitance element is connected in series between the first input/output port and the second input/output port.

3. The non-reciprocal circuit element according to claim 1 , wherein a reactance element is connected in parallel with respect to the resistance element.

4. The non-reciprocal circuit element according to claim 1 , wherein a reactance element is connected in parallel with respect to the resistance element.

5. The non-reciprocal circuit element according to claim 4 , wherein an additional capacitance element is connected in series between the first input/output port and the second input/output port.

6. The non-reciprocal circuit element according to claim 1 , wherein another end of the first center electrode and another end of the second center electrode are connected to a third input/output port.

7. The non-reciprocal circuit element according to claim 6 , wherein a reactance element is connected in parallel with respect to the resistance element.

8. The non-reciprocal circuit element according to claim 6 , wherein an additional capacitance element is connected in series between the first input/output port and the second input/output port.

Assignees

• Murata Manufacturing Co

Inventors

• Hino Seigo

Classifications

• H05K1/182

  associated with components mounted in printed circuit boards [PCB], e.g. insert-mounted components [IMC] · CPC title

• H03H7/52

  One-way transmission networks, i.e. unilines · CPC title

• H01P1/387 Primary

  Strip line circulators · CPC title

• H03H7/0115

  comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) · CPC title

• H03H7/18

  Networks for phase shifting · CPC title