Mobile device having RFID system

Abstract

A mobile communication terminal has a radio frequency identification (RFID) system to read information from RFID tags at predetermined distances. An RFID transmission antenna to transmit or receive a wireless signal for mobile communication to/from a base station, or transmit wireless signal to the RFID tag, and an RFID reception antenna to receive RFID wireless signal transmitted from the RFID tag. Accordingly, ingress of the RFID transmission carrier leakage to the RFID reception circuit can be prevented. Additionally, a small size antenna such as a chip ceramic antenna is used exclusively for RFID reception, and the RFID reception antenna is also used as a mobile communication antenna. As a result, the mobile communication terminal can be compact-sized, the size of transmission signal can be increased, and dynamic range increases without having to increase the sensitivity of the RFID tag, to extend the communication distance.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above objects and/or aspects of the present invention will become more apparent by describing in detail certain exemplary embodiments thereof with reference to the attached drawings, in which:

FIG. 1 is a schematic circuit diagram of an RFID tag and an RFID reader of a conventional RFID system;

FIG. 2 is a perspective view of an antenna area of a mobile communication terminal according to a first exemplary embodiment of the present invention;

FIG. 3 is a circuit diagram of a mobile communication terminal to transmit and receive an RFID wireless signal and a mobile communication wireless signal using one antenna disclosed by the Applicant in Korean Patent Application No. 10-2005-0120707, filed on Dec. 9, 2005;

FIG. 4A is a graphical representation of characteristic S11 of the main antenna of FIG. 2;

FIG. 4B is a graphical representation of characteristic S11 of the RFID reception antenna of FIG. 2;

FIG. 5 is a perspective view of an antenna area of a mobile communication terminal according to a second exemplary embodiment of the present invention;

FIG. 6A is a graphical representation of characteristic S11 when the communication matching circuit is operated to enable transmission and reception of mobile communication wireless signal over the main antenna of FIG. 5;

FIG. 6B is a graphical representation of characteristic S11 when the RFID matching circuit is operated to enable transmission and reception of an RFID wireless signal over the main antenna of FIG. 5; and

FIG. 7 is a perspective view of an antenna area of a mobile communication terminal according to a third exemplary embodiment of the present invention.

Claims

1. A mobile communication terminal comprising a radio frequency identification (RFID) system to read information from an RFID tag arranged at a distance, the mobile communication terminal comprising: an RFID transmission antenna which transmits or receives a wireless signal for mobile communication with a base station, and transmits a first RFID wireless signal to the RFID tag; andan RFID reception antenna which receives a second RFID wireless signal transmitted from the RFID tag.

2. The mobile communication terminal of claim 1, wherein the RFID transmission antenna comprises at least one of a whip antenna, a planar inverted F antenna (PIFA), and a patch antenna.

3. The mobile communication terminal of claim 2, wherein the RFID transmission antenna is a main antenna and is also used as a mobile communication antenna to transmit and receive a mobile communication wireless signal.

4. The mobile communication terminal of claim 3, further comprising an RFID matching circuit which changes an operational band of the main antenna to a frequency band to transmit an output of the first RFID wireless signal; and a communication matching circuit which matches the operational band of the main antenna to a frequency band for the mobile communication wireless signal.

5. The mobile communication terminal of claim 1, wherein the RFID reception antenna comprises a small size antenna.

6. The mobile communication terminal of claim 5, wherein the RFID reception antenna comprises a chip ceramic antenna which is formed of a dielectric substance.

7. The mobile communication terminal of claim 5, wherein the RFID receipt antenna comprises a small size antenna that is a type of a planar inverted-F antenna or an inverted-F antenna (PIFA/IFA).

8. The mobile communication terminal of claim 1, wherein the RFID transmission antenna and the RFID reception antenna are connected to a same ground.

9. The mobile communication terminal of claim 8, wherein a slot is extended from one side of the ground to remove coupling between the RFID transmission antenna and the RFID reception antenna.

10. The mobile communication terminal of claim 1, wherein the RFID reception antenna is provided separately from the RFID transmission antenna.

11. A mobile communication terminal comprising a radio frequency identification (RFID) system to read information from an RFID tag arranged at a distance, the mobile communication terminal comprising: a RFID transmission antenna which transmits a first RFID wireless signal to the RFID tag; anda RFID reception antenna which transmits or receives a wireless signal for mobile communication with a base station, and receives a second RFID wireless signal transmitted from the RFID tag.

12. The mobile communication terminal of claim 11, wherein the RFID reception antenna comprises at least one of a whip antenna, a planar inverted F antenna (PIFA), and a patch antenna.

13. The mobile communication terminal of claim 11, wherein the RFID reception antenna is a main antenna, and is also used as a mobile communication antenna to transmit and receive a mobile communication wireless signal.

14. The mobile communication terminal of claim 13, further comprising an RFID matching circuit which changes an operational band of the main antenna to a frequency band to receive an output of the second RFID signal; and a communication matching circuit which matches the operational band of the main antenna to a frequency band for the mobile communication wireless signal.

15. The mobile communication terminal of claim 11, wherein the RFID transmission antenna comprises a small size antenna.

16. The mobile communication terminal of claim 15, wherein the RFID transmission antenna comprises a chip ceramic antenna which is formed of a dielectric substance.

17. The mobile communication terminal of claim 15, wherein the RFID transmission antenna comprises a small size antenna that is a type of a planar inverted-F antenna or an inverted-F antenna (PIFA/IFA).

18. The mobile communication terminal of claim 13, wherein the RFID transmission antenna and the RFID reception antenna are connected to a same ground.

19. The mobile communication terminal of claim 18, wherein a slot is extended from one side of the ground to remove coupling between the RFID transmission antenna and the RFID reception antenna.

20. The mobile communication terminal of claim 11, wherein the RFID transmission antenna is provided separately from the RFID transmission antenna.