Wireless communication device and method of manufacturing same
A wireless communication device is provided that includes an RFIC module in which an RFIC chip and first and second terminal electrodes are incorporated, and an antenna member including an antenna base material and antenna patterns including first and second coupling portions. The RFIC module and the antenna member are bonded to each other via an insulating first adhesive layer. Between the first terminal electrode and the first coupling portion and between the second terminal electrode and the second coupling portion, a distance t 1 from a surface of the RFIC module in contact with the first adhesive layer to the first and second terminal electrodes is larger than a thickness t 2 of the first adhesive layer.
1. A wireless communication device comprising:
an RFIC module including an RFIC chip and first and second terminal electrodes connected to the RFIC chip;
an antenna member including an antenna base material and an antenna pattern disposed on the antenna base material and including first and second coupling portions that face the first and second terminal electrodes of the RFIC module, respectively; and
an insulating adhesive layer that bonds the RFIC module to the antenna member, with the insulating adhesive layer being interposed between the RFIC module and the antenna member,
wherein, between the first terminal electrode and the first coupling portion and between the second terminal electrode and the second coupling portion, a distance from a surface of the RFIC module in contact with the insulating adhesive layer to each of the first and second terminal electrodes, respectively, is larger than a thickness of the insulating adhesive layer.
2. The wireless communication device according to claim 1 ,
wherein the RFIC module includes a module base material, the RFIC chip is disposed on the module base material, the first and second terminal electrodes are disposed on the module base material and connected to the RFIC chip, and
wherein an insulating cover layer is disposed on the module base material to cover the first and second terminal electrodes.
3. The wireless communication device according to claim 2 , wherein the insulating cover layer of the RFIC module and the antenna member are bonded to each other by the insulating adhesive layer interposed therebetween.
4. The wireless communication device according to claim 3 , wherein, between the first terminal electrode and the first coupling portion and between the second terminal electrode and the second coupling portion, a thickness of the cover layer of the RFIC module is larger than the thickness of the insulating adhesive layer.
5. The wireless communication device according to claim 3 , wherein the cover layer includes a cover sheet made of an insulating material and an additional insulating adhesive layer interposed between the cover sheet and the module base material to bond the cover sheet to the module base material.
6. The wireless communication device according to claim 2 , wherein the module base material is a single sheet-shaped member, the RFIC chip is disposed on a first principal surface of the module base material, and the first and second terminal electrodes are disposed on a second principal surface on the side opposite to the first principal surface.
7. The wireless communication device according to claim 6 , further comprising a package layer that is disposed on an entirety of the first principal surface of the module base material so that the RFIC chip is embedded therein.
8. The wireless communication device according to claim 1 , wherein the RFIC module includes a matching circuit configured to match between the RFIC chip and the first and second terminal electrodes.
9. The wireless communication device according to claim 8 , wherein the matching circuit is disposed between the RFIC chip and the first and second terminal electrodes.
10. The wireless communication device according to claim 1 , wherein the distance from the surface of the RFIC module in contact with the insulating adhesive layer to each of the first and second terminal electrodes extends in a thickness direction that is perpendicular to a principal surface of the insulating adhesive layer, and the thickness of the insulating adhesive layer comprises a height in the thickness direction.
11. The wireless communication device according to claim 1 , wherein the distance from the surface of the RFIC module in contact with the insulating adhesive layer to each of the first and second terminal electrodes is 10 μm, and the thickness of the first adhesive layer 1 μm.
12. The wireless communication device according to claim 1 , wherein the RFIC chip is directly connected to first and second terminal electrodes.
13. A wireless communication device comprising:
an RFIC module including an RFIC chip and first and second terminal electrodes connected to the RFIC chip;
an antenna member including an antenna base material and an antenna pattern disposed on the antenna base material and including first and second coupling portions that face the first and second terminal electrodes of the RFIC module, respectively, in a thickness direction of the wireless communication device; and
an insulating adhesive layer that bonds the RFIC module to the antenna member, with the insulating adhesive layer being interposed between the RFIC module and the antenna member in the thickness direction,
wherein a distance in the thickness direction from a surface of the RFIC module in contact with the insulating adhesive layer to each of the first and second terminal electrodes, respectively, is larger than a thickness of the insulating adhesive layer in the thickness direction.
14. The wireless communication device according to claim 13 ,
wherein the RFIC module includes a module base material, the RFIC chip is disposed on the module base material, the first and second terminal electrodes are disposed on the module base material and connected to the RFIC chip, and
wherein an insulating cover layer is disposed on the module base material to cover the first and second terminal electrodes.
15. The wireless communication device according to claim 14 ,
wherein the insulating cover layer of the RFIC module and the antenna member are bonded to each other by the insulating adhesive layer interposed therebetween, and
wherein, between the first terminal electrode and the first coupling portion and between the second terminal electrode and the second coupling portion, the cover layer of the RFIC module has a thickness that is larger than the thickness of the insulating adhesive layer.
16. The wireless communication device according to claim 15 , wherein the distance from the surface of the RFIC module in contact with the insulating adhesive layer to each of the first and second terminal electrodes is 10 μm, and the thickness of the first adhesive layer 1 μm.
17. A method of manufacturing a wireless communication device, the method comprising:
preparing an RFIC module having an RFIC chip and first and second terminal electrodes connected to the RFIC chip;
preparing an antenna member that includes an antenna base material and an antenna pattern disposed on the antenna base material and includes first and second coupling portions that face the first and second terminal electrodes of the RFIC module;
bonding the RFIC module to the antenna member by an insulating adhesive layer interposed therebetween; and
interposing the insulating adhesive layer between a cover layer of the RFIC module and the antenna member so that a distance from a surface of the RFIC module in contact with the first adhesive layer to each of the first and second terminal electrodes, respectively, is larger than a thickness of the first adhesive layer at least at a position between the first terminal electrode and the first coupling portion and at a position between the second terminal electrode and the second coupling portion.
18. The method of manufacturing a wireless communication device according to claim 17 , wherein the insulating adhesive layer is a liquid adhesive agent before curing.
19. The method of manufacturing a wireless communication device according to claim 18 , further comprising mounting the RFIC module on the antenna member after the liquid adhesive agent is applied to the cover layer of the RFIC module.
20. The method of manufacturing a wireless communication device according to claim 17 , wherein the distance from the surface of the RFIC module in contact with the first adhesive layer to each of the first and second terminal electrodes extends in a thickness direction that is perpendicular to a principal surface of the insulating adhesive layer, and the thickness of the insulating adhesive layer comprises a height of the insulating adhesive layer in the thickness direction.