Multilayer coil device, antenna module, and wireless communication module

Patent metadata

Field	Value
Publication number	US-2016352016-A1
Application number	US-201615235286-A
Country	US
Kind code	A1
Filing date	Aug 12, 2016
Priority date	Feb 27, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

A multilayer coil device includes a multilayer body including first and second coil conductors each having a winding planar shape and a magnetic shield member having a planar shape. Winding regions of the first and second coil conductors partially overlap each other as seen in a direction in which the winding axes extend. The magnetic shield member is between the first and second coil conductors in the direction in which the winding axes extend and overlaps a first region where the first and second coil conductors overlap each other and does not overlap at least a portion of a second region where the first and second coil conductors do not overlap each other.

First claim

What is claimed is:

1 . A multilayer coil device comprising:
a multilayer body in which a plurality of insulating sheets are laminated; a first coil conductor and a second coil conductor defining a first coil and a second coil, respectively, disposed inside the multilayer body and each having a winding shape; and a magnetic shield member disposed inside the multilayer body and having a two-dimensional shape; wherein respective winding axes of the first coil and the second coil extend in a same or substantially a same direction and respective winding regions of the first coil and the second coil partially overlap each other as seen in the direction in which the winding axes extend; and the magnetic shield member is located between the first coil and the second coil in the direction in which the winding axes extend and overlaps a first region where the first coil and the second coil overlap each other and does not overlap at least a portion of a second region where the first coil and the second coil do not overlap each other, as seen in the direction in which the winding axes extend.

2 . The multilayer coil device according to claim 1 , wherein the direction in which the winding axes of the first coil and the second coil extend is identical or substantially identical with a direction in which the plurality of insulating sheets are laminated.

3 . The multilayer coil device according to claim 1 , further comprising a third coil including a third coil conductor disposed in the multilayer body and having a helical shape; wherein
the first coil, the second coil, and the magnetic shield member are arranged inside a region surrounded by the helical shape of the third coil.

4 . The multilayer coil device according to claim 3 , wherein the winding axes of the first coil and the second coil are perpendicular or substantially perpendicular to a winding axis of the third coil.

5 . The multilayer coil device according to claim 3 , wherein the first coil and the second coil are located in an inward region spaced apart by a predetermined distance from opposite ends of the third coil in a direction in which the winding axis of the third coil extends.

6 . The multilayer coil device according to claim 3 , wherein at least portions of the insulating sheets defining the multilayer body are magnetic, and
the first coil and the second coil are located between the magnetic insulating sheets.

7 . The multilayer coil device according to claim 3 , further comprising a plurality of via conductors for use in connecting the first coil, the second coil, and the third coil to an external terminal; wherein
a direction in which the plurality of via conductors are arranged is parallel or substantially parallel to the direction in which the winding axis of the third coil extends.

8 . The multilayer coil device according to claim 3 , wherein the third coil defines a coil antenna; and
the first coil and the second coil define inductors included in a circuit connected to the coil antenna.

9 . The multilayer coil device according to claim 1 , wherein the magnetic shield member surrounds only the first region.

10 . An antenna module comprising:
multilayer coil device according to claim 8 ; and a wireless IC connected to at least one of the inductors defined by the first coil and the second coil.

11 . The antenna module according to claim 10 , wherein the direction in which the winding axes of the first coil and the second coil extend is identical or substantially identical with a direction in which the plurality of insulating sheets are laminated.

12 . The antenna module according to claim 10 , wherein the winding axes of the first coil and the second coil are perpendicular or substantially perpendicular to a winding axis of the third coil.

13 . The antenna module according to claim 10 , wherein the first coil and the second coil are located in an inward region spaced apart by a predetermined distance from opposite ends of the third coil in a direction in which the winding axis of the third coil extends.

14 . The antenna module according to claim 10 , wherein at least portions of the insulating sheets defining the multilayer body are magnetic, and
the first coil and the second coil are located between the magnetic insulating sheets.

15 . The antenna module according to claim 10 , further comprising a plurality of via conductors for use in connecting the first coil, the second coil, and the third coil to an external terminal; wherein
a direction in which the plurality of via conductors are arranged is parallel or substantially parallel to the direction in which the winding axis of the third coil extends.

16 . The antenna module according to claim 10 , wherein the magnetic shield member surrounds only the first region.

17 . A wireless communication module comprising:
multilayer coil device according to claim 8 ; and a wireless IC connected to the inductors defined by the first coil and the second coil; wherein the first coil and the second coil define a filter circuit; and the coil antenna defined by the third coil is connected to the wireless IC with the filter circuit interposed therebetween and defines a radiating element.

18 . The wireless communication module according to claim 17 , wherein the direction in which the winding axes of the first coil and the second coil extend is identical or substantially identical with a direction in which the plurality of insulating sheets are laminated.

19 . The wireless communication module according to claim 17 , wherein the winding axes of the first coil and the second coil are perpendicular or substantially perpendicular to a winding axis of the third coil.

20 . The wireless communication module according to claim 17 , wherein the first coil and the second coil are located in an inward region spaced apart by a predetermined distance from opposite ends of the third coil in a direction in which the winding axis of the third coil extends.

Assignees

• Murata Manufacturing Co

Inventors

• Ito Hiromitsu

Classifications

• H01F17/0033

  with the coil helically wound around a magnetic core · CPC title

• H01Q7/00

  Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop · CPC title

• H01F2017/008

  Electric or magnetic shielding of printed inductances · CPC title

• H01F27/40

  Structural association with built-in electric component, e.g. fuse · CPC title

• H01Q1/241

  used in mobile communications, e.g. GSM (H01Q1/247, H01Q1/248 take precedence) · CPC title