Transformer and communication terminal device

Patent metadata

Field	Value
Publication number	US-2016248450-A1
Application number	US-201615145196-A
Country	US
Kind code	A1
Filing date	May 3, 2016
Priority date	Nov 5, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

In a transformer, first and second coils are provided on different substrate layers of a multilayer body. The first and second coil conductors are interlayer-connected to each other by interlayer connection conductors. A coil aperture defined by the first coil conductor and a coil aperture defined by the second coil conductor overlap each other when seen in a plan view from a laminating direction of the multilayer body. The first and second coil conductors are connected to each other at at least two places with the interlayer connection conductors interposed therebetween. A parallel connection portion including a first portion of the first coil conductor and a first portion of the second coil conductor is provided, and a series connection portion including a second portion of the first coil conductor and a second portion of the second coil conductor is provided.

First claim

What is claimed is:

1 . A transformer comprising:
a multilayer body including a plurality of substrate layers that are laminated in a lamination direction; and a first coil element and a second coil element that are provided in the multilayer body, that overlap each other when seen in a plan view from the lamination direction of the plurality of substrate layers, and that are coupled to each other; wherein the first coil element includes:
a first coil conductor and a second coil conductor that are provided on different ones of the plurality of substrate layers and that overlap each other when seen in the plan view; wherein
a first parallel connection portion is provided in a portion of the first coil element so that the first parallel connection portion includes a portion of the first coil conductor and a portion of the second coil conductor; and
the first coil conductor and the second coil conductor are connected to each other at at least two places with interlayer connection conductors interposed therebetween.

2 . The transformer according to claim 1 , wherein
a first external terminal connected to a first end of the first coil element and a second external terminal connected to a second end of the first coil element are provided on the multilayer body; and when the first coil conductor is traced from a first end of the first coil conductor, a position at which the parallel connection portion starts is a position that passes a first end of the second coil conductor.

3 . The transformer according to claim 1 , further comprising:
a power feeding terminal, an antenna terminal, and a ground terminal; wherein the power feeding terminal is connected to a first end of the first coil element, the antenna terminal is connected to a second end of the first coil element and to a first end of the second coil element, and the ground terminal is connected to a second end of the second coil element.

4 . The transformer according to claim 3 , wherein the power feeding terminal, the antenna terminal, and the ground terminal are provided on a side surface of the multilayer body.

5 . The transformer according to claim 3 , wherein the power feeding terminal is provided on a first side surface of the multilayer body, the antenna terminal is provided on a second side surface facing the first side surface of the multilayer body, and the ground terminal is provided on a third side surface of the multilayer body.

6 . The transformer according to claim 4 , wherein the power feeding terminal is provided on a first side surface of the multilayer body, the antenna terminal is provided on a second side surface facing the first side surface of the multilayer body, and the ground terminal is provided on a third side surface of the multilayer body.

7 . The transformer according to claim 1 , wherein the substrate layers are dielectric, magnetic, or dielectric and magnetic.

8 . The transformer according to claim 2 , wherein the substrate layers are dielectric, magnetic, or dielectric and magnetic.

9 . The transformer according to claim 3 , wherein the substrate layers are dielectric, magnetic, or dielectric and magnetic.

10 . The transformer according to claim 4 , wherein the substrate layers are dielectric, magnetic, or dielectric and magnetic.

11 . The transformer according to claim 5 , wherein the substrate layers are dielectric, magnetic, or dielectric and magnetic.

12 . The transformer according to claim 6 , wherein the substrate layers are dielectric, magnetic, or dielectric and magnetic.

13 . The transformer according to claim 1 , wherein
the second coil element includes a third coil conductor and a fourth coil conductor that are provided on different ones of the plurality of substrate layers and that overlap each other when seen in the plan view; a second parallel connection portion is provided in a portion of the second coil element so that the second parallel connection portion includes a portion of the third coil conductor and a portion of the fourth coil conductor; and the third coil conductor and the fourth coil conductor are connected at at least two places with interlayer connection conductors interposed therebetween.

14 . The transformer according to claim 1 , wherein the first parallel connection portion and the second parallel connection portion are located in different areas when seen in the plan view.

15 . A communication terminal device comprising:
an antenna that transmits and receives a radio-frequency signal; a power feeding circuit for the antenna; and a transformer provided between the power feeding circuit and the antenna; wherein the transformer includes:
a multilayer body including a plurality of substrate layers that are laminated in a lamination direction; and
a first coil element and a second coil element that are provided in the multilayer body, that overlap each other when seen in a plan view from the lamination direction of the plurality of substrate layers, and that are coupled to each other; wherein
the first coil element includes:
a first coil conductor and a second coil conductor that are provided on different ones of the plurality of substrate layers and that overlap each other when seen in a plan view; wherein
a first parallel connection portion is provided in a portion of the first coil element so that the first parallel connection portion includes a portion of the first coil conductor and a portion of the second coil conductor; and
the first coil conductor and the second coil conductor are connected to each other at at least two places with interlayer connection conductors interposed therebetween.

16 . The communication terminal device according to claim 15 , wherein
a first external terminal connected to a first end of the first coil element and a second external terminal connected to a second end of the first coil element are provided on the multilayer body; and when the first coil conductor is traced from a first end of the first coil conductor, a position at which the parallel connection portion starts is a position that passes a first end of the second coil conductor.

17 . The communication terminal device according to claim 15 , further comprising:
a power feeding terminal, an antenna terminal, and a ground terminal; wherein the power feeding terminal is connected to a first end of the first coil element, the antenna terminal is connected to a second end of the first coil element and to a first end of the second coil element, and the ground terminal is connected to a second end of the second coil element.

18 . The communication terminal device according to claim 17 , wherein the power feeding terminal, the antenna terminal, and the ground terminal are provided on a side surface of the multilayer body.

19 . The communication terminal device according to claim 17 , wherein the power feeding terminal is provided on a first side surface of the multilayer body, the antenna terminal is provided on a second side surface facing the first side surface of the multilayer body, and the ground terminal is provided on a third side surface of the multilayer body.

20 . The communication terminal device according to claim 15 , wherein the substrate layers are dielectric, magnetic, or dielectric and magnetic.

Assignees

• Murata Manufacturing Co

Inventors

• Ishizuka Kenichi

Classifications

• H04B1/40

  Circuits · CPC title

• H04B1/0053 Primary

  with common antenna for more than one band · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F27/2804

  Printed windings · CPC title