RADIO FREQUENCY IDENTIFICATION SYSTEM USING MULTIPLE BAND TRANSMISSION

• US 20100102933A1
• Filed: 10/29/2008
• Published: 04/29/2010
• Est. Priority Date: 10/29/2008
• Status: Active Grant

• Current Assignee: Getac Technology Company Limited (MiTAC Holdings Corp.)
• Original Assignee: Mitac Technology Corporation (MiTAC Holdings Corp.)
• Inventors: Hsieh, Yuan-Ning, Perng, Shin-Yao, Lee, Ta-Yung
• Granted Patent: US 8,947,209 B2
• Time in Patent Office: Days
• US Class Current: 340/10.200
• 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
• CPC Class Codes: G06K 7/10069 the collision being resolved in the frequency domain, e.g. by hopping from one frequency to the other frequency hopping or spread spectrum techniques H04B7/00
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices

Abstract

A radio frequency identification (RFID) system employs multiple band transmission to prevent signal collision. The system includes a plurality of RFID tag groups and at least one RFID reader. Each RFID tag group includes at least one RFID tag. The RFID tags of the same RFID tag group are operated for radio frequency transmission in the same transmission frequency band, and those of different RFID tag groups are operated for radio frequency transmission in different transmission frequency bands. When the RFID reader simultaneously receives radio frequency signals issued from RFID tags of different RFID tag groups, since they are transmitted in different transmission frequency bands, signal collision among the RFID tags of the RFID tag groups can be avoided.

Claims

1. A radio frequency identification system that employs multiple band transmission to prevent a signal collision, comprising:

a plurality of RFID tag groups, each comprising a plurality of RFID tags each containing tag information, the RFID tags of one RFID tag group being set in operation of a radio frequency transmission in a same predetermined transmission frequency band, the RFID tags belonging to different ones of the RFID tag groups being set in operation of a radio frequency transmission in different ones of the transmission frequency bands; and

at least one RFID reader, which comprises a multiple-band radio frequency transmission/reception module for transmitting/receiving the tag information of the RFID tags of the RFID tag groups.

2. The radio frequency identification system as claimed in claim 1, wherein the RFID tag comprises a microprocessor that is connected to a memory unit and a radio frequency transmission/reception module.

3. The radio frequency identification system as claimed in claim 2, wherein the microprocessor of the RFID tag is connected to a power supply unit that supplies electrical power desired by the RFID tag.

4. The radio frequency identification system as claimed in claim 1, wherein the tag information comprises a tag identification code and tag identification data.

5. The radio frequency identification system as claimed in claim 4, wherein the tag identification data comprises one of available tag power, tag mode, data of firmware version, data of software version, transmission bandwidth, transmission power, data of authenticity, tag owner, and data of group to which the tag belongs or a combination thereof.

6. The radio frequency identification system as claimed in claim 1, wherein the RFID reader comprises a connection interface that connects a controller host.

7. A radio frequency identification system that employs multiple band transmission to prevent signal collision, comprising:

a plurality of RFID tag groups, each comprising a plurality of RFID tags each containing tag information, the RFID tags of one RFID tag group being set in operation of a radio frequency transmission in a same predetermined transmission frequency band, the RFID tags belonging to different ones of the RFID tag groups being set in operation of a radio frequency transmission in different ones of the transmission frequency bands; and

at least one RFID reader, which comprises a plurality of radio frequency transmission/reception modules respectively corresponding to the transmission frequency bands of the plurality of RFID tag groups for transmitting/receiving the tag information of the RFID tags of the RFID tag groups.

8. The radio frequency identification system as claimed in claim 7, wherein the RFID tag comprises a microprocessor that is connected to a memory unit and a radio frequency transmission/reception module.

9. The radio frequency identification system as claimed in claim 8, wherein the microprocessor of the RFID tag is connected to a power supply unit that supplies electrical power desired by the RFID tag.

10. The radio frequency identification system as claimed in claim 7, wherein the tag information comprises a tag identification code and tag identification data.

11. The radio frequency identification system as claimed in claim 10, wherein the tag identification data comprises one of available tag power, tag mode, data of firmware version, data of software version, transmission bandwidth, transmission power, data of authenticity, tag owner, and data of group to which the tag belongs or a combination thereof.

12. The radio frequency identification system as claimed in claim 7, wherein the RFID reader comprises a connection interface that connects a controller host.