Refrigerator and method of controlling the same

1. A refrigerator comprising:

tags attached to goods stored in a storage chamber including a plurality of storage cells;

a reader, including a plurality of antennas having different transmission and reception distances, identifying the tags using the antennas; and

a control unit detecting locations of the tags attached to goods stored in the storage chamber based on whether the tags are detected by the different transmission and reception distances of the antennas,

wherein the antennas correspond to the respective storage cells, and the storage cells are disposed within the transmission and reception distances of the corresponding antennas, and

when the stored goods in the storage chamber is searched by the antennas, information of the stored goods is obtained by an antenna having a relatively small transmission and reception distance, information of the stored goods is obtained by another antenna having a relatively large transmission and reception distance, comparison between the information of the stored goods obtained by the antenna having the relative small transmission and reception distance and the information of the stored goods obtained by the antenna having the relatively large transmission and reception distance is made to extract the difference therebetween, and the difference between the information of the stored goods obtained by the antenna having the relative small transmission and reception distance and the information of the stored goods obtained by the antenna having the relatively large transmission and reception distance is determined as information of the goods stored in the storage cell corresponding to the antenna having the relatively large transmission and reception distance.

2. The refrigerator according to claim 1 , wherein

the tags are radio frequency ID (RFID) tags, and

the antennas transmit and receive RF signals.

3. The refrigerator according to claim 1 , wherein the storage chamber includes a plurality of storage cells, the antennas correspond to each of the respective storage cells, and the storage cells are disposed within the transmission and reception distances of the corresponding antennas.

4. The refrigerator according to claim 3 , wherein the transmission and reception distances of the antennas are limited to the distances from the antennas to the corresponding storage cells.

5. The refrigerator according to claim 3 , wherein the control unit performs a control operation to simultaneously operate the antennas when the control unit controls the reader to search the goods stored in the storage chamber.

6. The refrigerator according to claim 1 , wherein the antennas generate magnetic fields having different respective strengths.

7. The refrigerator according to claim 1 , wherein the antennas are roof antennas having different radiuses.

8. A method of controlling a refrigerator having a storage chamber including a plurality of storage cells, tags attached to goods stored in the storage chamber, and a reader including a plurality of antennas having different transmission and reception distances, identifying the tags using the antennas, the method comprising:

detecting stored positions of the goods stored in the storage chamber based on whether the tags are detected by the different transmission and reception distances of the antennas,

wherein the antennas correspond to the respective storage cells, and the storage cells are disposed within the transmission and reception distances of the corresponding antennas, and

when the stored goods in the storage chamber is searched by the antennas, information of the stored goods is obtained by an antenna having a relatively small transmission and reception distance, information of the stored goods is obtained by another antenna having a relatively large transmission and reception distance, comparison between the information of the stored goods obtained by the antenna having the relative small transmission and reception distance and the information of the stored goods obtained by the antenna having the relatively large transmission and reception distance is made to extract the difference therebetween, and the difference between the information of the stored goods obtained by the antenna having the relative small transmission and reception distance and the information of the stored goods obtained by the antenna having the relatively large transmission and reception distance is determined as information of the goods stored in the storage cell corresponding to the antenna having the relatively large transmission and reception distance.

9. The method according to claim 8 , wherein the antennas are simultaneously operated to obtain information of the goods stored in the storage chamber when the reader is controlled to search the goods stored in the storage chamber.