Radio communication device and radio communication system
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.
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.
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.
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.
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.
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.