Radio communication device and radio communication system

• US 20090189742A1
• Filed: 04/22/2008
• Published: 07/30/2009
• Est. Priority Date: 01/24/2008
• Status: Abandoned Application

• Current Assignee: Fujitsu Mobile Communications Limited (Fujitsu Limited)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Watanabe, Hiroshi
• Application Number:
  US12/148,797
• Publication Number:
  US 20090189742A1
• Time in Patent Office: Days
• US Class Current: 340/10.310
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

According to one embodiment, a radio communication device includes: an antenna that communicates with a non-contact IC card by a radio signal having a predetermined frequency, the antenna having an unique resonance frequency in vicinity of the predetermined frequency; a frequency changer that shifts a resonance frequency of the antenna from the vicinity of the predetermined frequency to a high resonance frequency higher than the unique resonance frequency when the frequency changer is activated; a controller that controls whether or not the frequency changer is activated.

Claims

1. A radio communication device comprising:

an antenna that communicates with a non-contact IC card by a radio signal having a predetermined frequency, the antenna having an unique resonance frequency in vicinity of the predetermined frequency;

a frequency changer that shifts a resonance frequency of the antenna from the vicinity of the predetermined frequency to a high resonance frequency higher than the unique resonance frequency when the frequency changer is activated;

a controller that controls whether or not the frequency changer is activated.

2. The radio communication device according to claim 1, wherein the controller activates the frequency changer to shift the resonance frequency to the high resonance frequency when an operation mode is determined for communicating with the IC card.

3. The radio communication device according to claim 2, wherein the controller controls the frequency changer to communicate with another radio communication device as a non-contact IC card.

4. The radio communication device according to claim 1, wherein, when the predetermined frequency is 13.56 megahertz, the frequency changer shifts the resonance frequency to the high resonance frequency having a range from 14 megahertz to 18 megahertz.

13. The radio communication device according to claim 1, wherein the frequency changer include a reactance element to shift the resonance frequency from the vicinity of the predetermined frequency to the high resonance frequency.

5. A radio communication system comprising:

a non-contact IC card; and

a reader/writer device that establish communication with the non-contact IC cart by a radio signal having a predetermined frequency while opposing each other;

wherein the reader/writer has;

an antenna that has an unique resonance frequency;

a frequency changer that shifts the resonance frequency from the vicinity of the predetermined frequency to a high resonance frequency higher than the unique resonance frequency when the frequency changer is activated;

a controller that controls whether or not the frequency changer is activated.

6. The radio communication system according to claim 5, wherein the controller activates the frequency changer to shift the resonance frequency to the high resonance frequency when an operation mode is determined for communicating with the IC card.

7. The radio communication system according to claim 6, wherein the controller controls the frequency changer to communicate with another radio communication device as a non-contact IC card.

8. The radio communication system according to claim 5, wherein, when the predetermined frequency is 13.56 megahertz, the frequency changer shifts the resonance frequency to the high resonance frequency having a range from 14 megahertz to 18 megahertz.

14. The radio communication system according to claim 5, wherein the frequency changer include a reactance element to shift the resonance frequency from the vicinity of the predetermined frequency to the high resonance frequency.

9. A control method for a radio communication device comprising:

communicating with a non-contact IC card by a radio signal having a predetermined frequency by using an antenna having an unique resonance frequency in vicinity of the predetermined frequency;

shifting a resonance frequency of the antenna from the vicinity of the predetermined frequency to a high resonance frequency higher than the unique resonance frequency;

controlling whether or not the resonance frequency is shifted.

10. The control method according to claim 9, wherein the resonance frequency is changed to the high resonance frequency when an operation mode is determined for communicating with the IC card.

11. The control method according to claim 10, wherein the resonance frequency is changed for communicating with another radio communication device as a non-contact IC card, when the operation mode is determined for communicating with another radio communication device as a non-contact IC card.

12. The control method according to claim 9, wherein, when the predetermined frequency is 13.56 megahertz, the resonance frequency is changed to the high resonance frequency having a range from 14 megahertz to 18 megahertz.