Wireless communication device

• US 8,937,576 B2
• Filed: 03/01/2013
• Issued: 01/20/2015
• Est. Priority Date: 04/05/2011
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Dokai, Yuya, Mukai, Tsuyoshi
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US13/782,346
• Publication Number:
  US 20130176184A1
• Time in Patent Office: 690 Days
• Field of Search: 343/795, 343/700.MS, 343/702, 343/749
• US Class Current: 343/749
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: H01Q 1/20 Resilient mountings
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A wireless communication device includes a flexible base material film, a flexible antenna conductor that is provided in substantially the entire region of one main surface of the flexible base material film and that includes a first radiation element and a second radiation element facing each other through a slit, an inductor substrate that is connected to the first radiation element and the second radiation element so as to extend across the slit, the inductor substrate including an inductance element, and a wireless IC element that is connected in parallel to the inductance element and that is mounted in the inductor substrate. The wireless IC element is connected to the first radiation element and the second radiation element so as to extend across the slit.

Claims

1. A wireless communication device comprising:

a flexible base material film;

a flexible antenna conductor provided in substantially an entire region of one main surface of the flexible base material film and including a first radiation element and a second radiation element facing each other with a slit therebetween;

an inductor substrate connected to the first radiation element and the second radiation element so as to extend across the slit, the inductor substrate including an inductance element; and

a wireless IC element connected in parallel to the inductance element and mounted on or in the inductor substrate.

2. The wireless communication device according to claim 1, wherein

an insulating protective film is provided in substantially the entire region of the one main surface of the flexible base material film so as to cover the first radiation element and the second radiation element;

and

the inductor substrate is connected to each of the first radiation element and the second radiation element through an aperture portion provided in the insulating protective film.

3. The wireless communication device according to claim 1, wherein the first radiation element and the second radiation element are capacitively coupled to each other through the slit.

4. The wireless communication device according to claim 1, wherein

the inductor substrate is a laminated substrate including a plurality of insulator layers or dielectric layers that are laminated on one another;

and

the inductance element includes a coiled conductor provided within the laminated substrate.

5. The wireless communication device according to claim 4, wherein in the inductance element, a winding axis of the coiled conductor provided within the laminated substrate extends in a direction perpendicular or substantially perpendicular to the flexible antenna conductor.

6. The wireless communication device according to claim 5, wherein in a planar view, the inductor substrate is disposed so that at least a portion of a coil inner diameter region of the coiled conductor overlaps with the slit.

7. The wireless communication device according to claim 4, wherein in the inductance element, a winding axis of the coiled conductor provided within the laminated substrate extends in a planar direction of the flexible antenna conductor.

8. A wireless communication device comprising:

a flexible base material film;

a flexible antenna conductor provided in substantially an entire region of one main surface of the flexible base material film and including a first radiation element and a second radiation element facing each other with a slit therebetween;

an inductor substrate connected to the first radiation element and the second radiation element so as to extend across the slit, the inductor substrate including an inductance element; and

a wireless IC element connected to the first radiation element and the second radiation element so as to extend across the slit and connected in parallel to the inductance element.

9. The wireless communication device according to claim 8, wherein

an insulating protective film is provided in substantially the entire region of the one main surface of the flexible base material film so as to cover the first radiation element and the second radiation element;

and

the inductor substrate is connected to each of the first radiation element and the second radiation element through an aperture portion provided in the insulating protective film, and the wireless IC element is connected to each of the first radiation element and the second radiation element through an aperture portion provided in the insulating protective film.

10. The wireless communication device according to claim 8, wherein the first radiation element and the second radiation element are capacitively coupled to each other through the slit.

11. The wireless communication device according to claim 8, wherein

the inductor substrate is a laminated substrate including a plurality of insulator layers or dielectric layers that are laminated on one another;

and

the inductance element includes a coiled conductor provided within the laminated substrate.

12. The wireless communication device according to claim 11, wherein in the inductance element, a winding axis of the coiled conductor provided within the laminated substrate extends in a direction perpendicular or substantially perpendicular to the flexible antenna conductor.

13. The wireless communication device according to claim 12, wherein in a planar view, the inductor substrate is disposed so that at least a portion of a coil inner diameter region of the coiled conductor overlaps with the slit.

14. The wireless communication device according to claim 11, wherein in the inductance element, a winding axis of the coiled conductor provided within the laminated substrate extends in a planar direction of the flexible antenna conductor.

15. The wireless communication device according to claim 8, wherein the inductor substrate is taller than the wireless IC element.

16. The wireless communication device according to claim 8, wherein a protective substrate taller than the wireless IC element is mounted on the flexible base material film in such a manner as to cross the slit and so that the wireless IC element is located between the protective substrate and the inductor substrate.

17. The wireless communication device according to claim 16, wherein the protective substrate is an inductor substrate including an inductance element.

18. The wireless communication device according to claim 8, wherein the wireless IC element is directly connected to the first radiation element and to the second radiation element so as to extend across the slit and is connected in parallel to the inductance element.

19. The wireless communication device according to claim 8, wherein the wireless IC element is spaced apart from the inductor substrate along a direction in which the slit extends.