Radio system, radio apparatus, and antenna device

1. A radio system comprising:

a first radio apparatus that has a first loop antenna; and

a second radio apparatus that has a second loop antenna and that performs a radio communication with the first radio apparatus when the second loop antenna is opposed with the first loop antenna,

wherein the second radio apparatus has a shield member that is formed of a magnetic substance and disposed to shield at least a portion of the second loop antenna with respect to the first loop antenna when the radio communication is performed.

2. The radio system according to claim 1 ,

wherein the shield member is disposed to wrap at least a portion of the second loop antenna.

3. The radio system according to claim 1 ,

wherein the second radio apparatus has a second shield member that is formed of a magnetic substance and disposed to be penetrated by magnetic fluxes of the second loop antenna and of the first loop antenna when the radio communication is performed.

4. The radio system according to claim 1 ,

wherein the second antenna is formed into a rectangular shape.

5. The radio system according to claim 1 ,

wherein the second radio apparatus has a housing case; and

wherein the shield member is attached to an interior surface of the housing case.

6. A radio apparatus comprising:

a built-in loop antenna that is to be opposed with a loop antenna of an external apparatus for performing a radio communication between the radio apparatus and the external apparatus; and

a shield member that is formed of a magnetic substance disposed to shield at least a portion of the built-in loop antenna with respect to the loop antenna of the external apparatus when the radio communication is performed.

7. The radio apparatus according to claim 6 ,

wherein the shield member is disposed to wrap at least a portion of the built-in loop antenna.

8. The radio apparatus according to claim 6 , further comprising:

a second shield member that is formed of a magnetic substance and disposed to be penetrated by magnetic fluxes of the built-in loop antenna and the loop antenna of the external apparatus when the radio communication is performed.

9. The radio apparatus according to claim 6 ,

wherein the built-in loop antenna is formed into a rectangular shape.

10. The radio apparatus according to claim 6 further comprising:

a housing case;

wherein the shield member is attached to an interior surface of the housing case.

11. An antenna device that is included in a radio apparatus and that is to be opposed with a loop antenna of an external apparatus for performing a radio communication between the radio apparatus and the external apparatus, the antenna device comprising:

an antenna element that is formed into a loop shape; and

a shield member that is formed of a magnetic substance disposed to shield at least a portion of the antenna element with respect to the loop antenna of the external apparatus when the radio communication is performed.

12. The antenna device according to claim 11 ,

wherein the shield member is disposed to wrap at least a portion of the antenna element.

13. The antenna device according to claim 11 , further comprising:

a second shield member that is formed of a magnetic substance and disposed to be penetrated by magnetic fluxes of the antenna element and the loop antenna of the external apparatus when the radio communication is performed.

14. The antenna device according to claim 11 ,

wherein the antenna element is formed into a rectangular shape.

15. The antenna device according to claim 11 further comprising:

a housing case;

wherein the shield member is attached to an interior surface of the housing case.