MULTIPLE BAND RFID READER DEVICE

• US 20090303007A1
• Filed: 07/06/2007
• Published: 12/10/2009
• Est. Priority Date: 07/10/2006
• Status: Abandoned Application

• Current Assignee: EMW Antenna Company Limited
• Original Assignee: EMW Antenna Company Limited
• Inventors: Sung, Won Mo, Ryou, Byung Hoon, Park, Chang Hyun, Shin, Dong Ryul
• Application Number:
  US12/308,807
• Publication Number:
  US 20090303007A1
• Time in Patent Office: Days
• US Class Current: 340/10.100
• CPC Class Codes: H04B 5/77 for interrogation

Abstract

There is disclosed a multi-band RFID reader, including a duplexer for separating a data signal received from a tag according to a frequency band, a directional coupler for diverging a part of the signal separated through the duplexer, a Digital Signal Processor (DSP) for determining a frequency band of the diverged signal and generating a control signal based on the determination result, and Radio Frequency (RF) switch for turning on/off transmission/reception modes in response to the control signal of the DSP. The multi-band RFID reader can read signals received from various kinds of tags by employing a multi-frequency band irrespective of frequency bands.

Claims

1. A multi-band Radio Frequency IDentification (RFID) reader, comprising:

a duplexer for separating a data signal received from a tag according to a frequency band;

a directional coupler for diverging a part of the signal separated through the duplexer;

a Digital Signal Processor (DSP) for determining a frequency band of the diverged signal and generating a control signal based on the determination result; and

Radio Frequency (RF) switch for turning on/off transmission/reception modes in response to the control signal of the DSP.

2. The multi-band RFID reader of claim 1, wherein the RF switch periodically switches the transmission mode and the reception mode when the control signal is received.

3. The multi-band RFID reader of claim 1, wherein different frequency band signals are transmitted or received with a time delay so that data transmission/reception of high reliability is guaranteed.

4. The multi-band RFID reader of claim 1, wherein transmission and reception paths of the signal are separated according to operations of the RF switch, thereby improving a recognition rate of the tag.

5. The multi-band RFID reader of claim 1, wherein the duplexer separates the data signal into a UHF band signal and a 2.45 GHz band signal.

6. A multi-band RFID reader, comprising:

a duplexer for separating a data signal of a tag, received through an antenna, according to frequency bands;

a DSP for generating a control signal based on the separated signal; and

RF switch for turning on/off transmission/reception modes in response to the control signal of the DSP.

7. The multi-band RFID reader of claim 6, wherein the RF switch periodically switches the transmission mode and the reception mode when the control signal is received.

8. The multi-band RFID reader of claim 6, wherein different frequency band signals are transmitted or received with a time delay so that data transmission/reception of high reliability is guaranteed.

9. The multi-band RFID reader of claim 6, wherein transmission and reception paths of the signal are separated according to operations of the RF switch, thereby improving a recognition rate of the tag.

10. The multi-band RFID reader of claim 6, wherein the duplexer separates the data signal into a UHF band signal and a 2.45 GHz band signal.

11. The multi-band RFID reader of claim 6, wherein the DSP determines whether the antenna has received the data signal to generates the control signal.