Wireless communication device

• US 10,170,835 B2
• Filed: 07/30/2015
• Issued: 01/01/2019
• Est. Priority Date: 01/30/2014
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Murayama, Hiromi
• Primary Examiner(s): Han, Jessica
• Assistant Examiner(s): Bouizza, Michael
• Application Number:
  US14/813,236
• Publication Number:
  US 20150333406A1
• Time in Patent Office: 1,251 Days
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 1/24 with receiving set
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 7/00 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 Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/77 for interrogation

Abstract

A wireless communication device includes a lower metal housing as a planar conductor including an opening and a planar coil antenna arranged so as to oppose the opening and including a coil pattern and a coil opening. A linear strip pattern which includes a plurality of linear strip portions parallel or substantially parallel with one another and a portion of which is connected to the lower metal housing around the opening is provided in the opening to achieve sufficient communication characteristics and prevent an increase in an opening area of the opening.

Claims

1. A wireless communication device comprising:

a planar conductor including an opening;

a housing including the planar conductor;

a planar coil antenna opposed to the opening and including a coil pattern and a coil opening; and

a linear strip pattern including a plurality of linear strip portions parallel or substantially parallel with one another;

wherein

a portion of the linear strip pattern which is connected to the planar conductor around the opening is provided in the opening;

the opening of the planar conductor is not connected to any peripheral edge of the planar conductor; and

the planar coil antenna is incorporated in the housing.

2. The wireless communication device according to claim 1, wherein a dimension of the linear strip portions in a dimension of the opening in an extension direction is larger than an outer dimension of the coil pattern in a same direction when seen from above.

3. The wireless communication device according to claim 1, wherein when seen from above, a dimension of the linear strip portions in a dimension of the opening in an extension direction is larger than a dimension of the linear strip portions in a direction perpendicular or substantially perpendicular to the extension direction and a dimension of the opening is larger than a dimension of the coil opening in the direction perpendicular or substantially perpendicular to the extension direction of the linear strip portions.

4. The wireless communication device according to claim 1, wherein the opening has a rectangular or substantially rectangular shape when seen from above and the linear strip pattern is connected to two opposing sides of the opening.

5. The wireless communication device according to claim 1, wherein a coverage of the opening by the linear strip pattern is equal to or higher than about 30%.

6. The wireless communication device according to claim 1, wherein an inductance value of the planar coil antenna is defined such that a resonant frequency of the planar coil antenna is a predetermined value in accordance with inductance of the linear strip pattern coupled to the planar coil antenna.

7. The wireless communication device according to claim 1, wherein a winding width of the coil pattern of the planar coil antenna is larger than a total value of a line width for two linear strip portions and a line-to-line distance of the linear strip portions.

8. The wireless communication device according to claim 1, wherein both ends of the respective linear strip portions are connected to an inner circumference of the opening.

9. The wireless communication device according to claim 1, wherein slits are provided between adjacent ones of the plurality of linear strip portions.

10. The wireless communication device according to claim 1, wherein a magnetic layer is provided on the coil opening and the coil pattern.

11. The wireless communication device according to claim 1, further comprising a capacitor of a power supply circuit connected to the coil pattern.

12. The wireless communication device according to claim 1, wherein the linear strip pattern has one of a stripe shape and a meandering shape.

13. The wireless communication device according to claim 1, wherein the linear strip pattern includes a plurality of comb-shaped linear strip patterns provided in the opening.

14. The wireless communication device according to claim 13, wherein the housing is a metal housing, and the plurality of comb-shaped linear strip patterns define a portion of the metal housing.

15. The wireless communication device according to claim 1, wherein the housing is a metal housing of a wireless communication apparatus, and the linear strip pattern is provided on the metal housing.

16. A mobile communication terminal comprising the wireless communication device according to claim 1.

17. The mobile communication terminal according to claim 16, wherein the housing is a metal housing of the mobile communication terminal, and both ends of the linear strip pattern are connected to the metal housing.

18. The mobile communication terminal according to claim 17, wherein the both ends of the linear strip pattern are connected to the metal housing at one of a position alone one side of the opening, and at positions at or near diagonal corners of the opening.

19. A wireless communication apparatus comprising the wireless communication device according to claim 1.

20. The wireless communication apparatus according to claim 19, wherein the wireless communication apparatus is a computer.

21. The wireless communication device according to claim 1, wherein in a plan view, the planar coil antenna overlaps with the opening of the planar conductor.