Electromagnetic resonance coupler and transmission apparatus

Patent metadata

Field	Value
Publication number	US-9287910-B2
Application number	US-201514676816-A
Country	US
Kind code	B2
Filing date	Apr 2, 2015
Priority date	Apr 15, 2014
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

An electromagnetic resonance coupler according to one aspect of the present disclosure includes a first layer, a second layer which faces a first principal surface of the first layer, a third layer which faces a second principal surface of the first layer, a first resonator which is located between the first layer and the second layer, and a second resonator which is located between the first layer and the third layer. A dielectric constant of the first layer is lower than either one of a dielectric constant of the second layer and a dielectric constant of the third layer. A dielectric dissipation factor of the first layer is higher than either one of a dielectric dissipation factor of the second layer and a dielectric dissipation factor of the third layer.

First claim

What is claimed is:

1. An electromagnetic resonance coupler comprising:
a first layer including a first principal surface and a second principal surface opposite to the first principal surface, the first layer having a first dielectric constant and a first dielectric dissipation factor;
a second layer facing the first principal surface of the first layer, the second layer having a second dielectric constant higher than the first dielectric constant and a second dielectric dissipation factor lower than the first dielectric constant;
a third layer facing the second principal surface of the first layer, the third layer having a third dielectric constant higher than the first dielectric constant and a third dielectric dissipation factor lower than the first dielectric constant;
a first resonator located between the first layer and the second layer, the first resonator having a planar shape; and
a second resonator located between the first layer and the third layer, the second resonator having a planar shape.

2. The electromagnetic resonance coupler according to claim 1 , wherein the first layer, the second layer, and the third layer are dielectric layers.

3. The electromagnetic resonance coupler according to claim 1 , wherein the first dielectric constant is higher than 1.

4. The electromagnetic resonance coupler according to claim 1 , wherein
the second layer includes a second resin layer and a second filler dispersed in the second resin layer, the second filler being higher in dielectric constant than the second resin layer, and
the third layer includes a third resin layer and a third filler dispersed in the third resin layer, the third filler being higher in dielectric constant than the third resin layer.

5. The electromagnetic resonance coupler according to claim 4 , wherein the first layer includes a first resin layer and does not include a filler.

6. The electromagnetic resonance coupler according to claim 1 , wherein
the first layer includes a first resin layer and a first filler dispersed in the first resin layer, the first filler being higher in dielectric constant than the first resin layer,
the second layer includes a second resin layer and a second filler dispersed in the second resin layer, the second filler being higher in dielectric constant than the second resin layer,
the third layer includes a third resin layer and a third filler dispersed in the third resin layer, the third filler being higher in dielectric constant than the third resin layer, and
a first volume fraction of the first filler in the first layer is smaller than either one of a second volume fraction of the second filler in the second layer and a third volume fraction of the third filler in the third layer.

7. The electromagnetic resonance coupler according to claim 1 , wherein
the electromagnetic resonance coupler operative to isolatedly transmit a transmission signal from one of the first resonator and the second resonator to the other of the first resonator and the second resonator, and
a distance between the first resonator and the second resonator is not more than one-half of a wavelength of the transmission signal.

8. The electromagnetic resonance coupler according to claim 1 , wherein the first layer includes a plurality of dielectric layers.

9. The electromagnetic resonance coupler according to claim 1 , further comprising:
at least one dielectric layer located at least one of a position between the first layer and the first resonator, a position between the second layer and the first resonator, a position between the first layer and the second resonator, and a position between the third layer and the second resonator, the at least one dielectric layer having a dielectric constant higher than the first dielectric constant.

10. The electromagnetic resonance coupler according to claim 1 , further comprising:
a first ground layer facing the second layer, the second layer located between the first ground layer and the first layer; and
a second ground layer facing the third layer, the third layer located between the second ground layer and the first layer.

11. The electromagnetic resonance coupler according to claim 10 , wherein
the first resonator includes a first wire including a first connection and a second connection, a first input wire connected to the first connection, and a second input wire connected to the second connection,
the second resonator includes a second wire including a third connection and a fourth connection, a first output wire connected to the third connection, and a second output wire connected to the fourth connection,
the first ground is connected to the first wire at a first position between the first connection and the second connection in the first wire, and
the second ground is connected to the second wire at a second position between the third connection and the fourth connection in the second wire.

12. The electromagnetic resonance coupler according to claim 11 , wherein
the first wire has a first loop shape which is partially open, and
the second wire has a second loop shape which is partially open.

13. The electromagnetic resonance coupler according to claim 12 , wherein
a first outer peripheral contour of the first wire and a second outer peripheral contour of the second wire coincide with each other when viewed from a direction perpendicular to the first principal surface.

14. The electromagnetic resonance coupler according to claim 12 , wherein
the first wire and the second wire are symmetric with respect to a point when viewed from a direction perpendicular to the first principal surface.

15. A transmission apparatus comprising:
an electromagnetic resonance coupler;
a sender which generates a transmission signal by modulating a radio-frequency wave in accordance with an input signal and sends the transmission signal to the first resonator; and
a receiver which generates an output signal by rectifying the transmission signal output from the second resonator, wherein the electromagnetic resonance coupler includes:
a first layer including a first principal surface and a second principal surface opposite to the first principal surface, the first layer having a first dielectric constant and a first dielectric dissipation factor;
a second layer facing the first principal surface of the first layer, the second layer having a second dielectric constant higher than the first dielectric constant and a second dielectric dissipation factor lower than the first dielectric constant;
a third layer facing the second principal surface of the first layer, the third layer having a third dielectric constant higher than the first dielectric constant and a third dielectric dissipation factor lower than the first dielectric constant;
a first resonator located between the first layer and the second layer, the first resonator having a planar shape; and
a second resonator located between the first layer and the third layer, the second resonator having a planar shape.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Fujiwara Hideaki
• Tabata Osamu
• Nagai Shuichi

Classifications

• H04B1/0475 Primary

  with means for limiting noise, interference or distortion (H04B1/0483 takes precedence) · CPC title

• H01P7/084

  Triplate line resonators (H01P7/088 takes precedence) · CPC title

• H01P5/028

  between strip lines · CPC title

• H01P1/20345 Primary

  Multilayer filters · CPC title