CA2163311A1 - Passive transponder identification apparatus - Google Patents
Passive transponder identification apparatusInfo
- Publication number
- CA2163311A1 CA2163311A1 CA 2163311 CA2163311A CA2163311A1 CA 2163311 A1 CA2163311 A1 CA 2163311A1 CA 2163311 CA2163311 CA 2163311 CA 2163311 A CA2163311 A CA 2163311A CA 2163311 A1 CA2163311 A1 CA 2163311A1
- Authority
- CA
- Canada
- Prior art keywords
- microprocessor
- transmitter
- transponders
- antennas
- reader
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10356—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
A passive transponder identification apparatus which includes a plurality of transponders, a microprocessor and a single reader/transmitter coupled to the microprocessor. A
plurality of antennas are provided with each antenna being coupled via a signal relay with the microprocessor. Each one of the plurality of antennas is dedicated to one of the plurality of transponders. The microprocessor sequentially activates each one of the plurality of antennas to send a signal from the single reader/transmitter. An exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
plurality of antennas are provided with each antenna being coupled via a signal relay with the microprocessor. Each one of the plurality of antennas is dedicated to one of the plurality of transponders. The microprocessor sequentially activates each one of the plurality of antennas to send a signal from the single reader/transmitter. An exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
Description
._ TITLE OF THE INVENTION:
passive transponder identification apparatus NAMES OF INVENTORS:
Camiel Huisma Robert Edward Isted FIELD OF THE INVENTION
The present invention relates to a passive transponder identification apparatus and, in particular, one that is capable of being used with multiple transponders.
R~KGROUND OF THE INVENTION
Over the past twenty years passive radio frequency identification has been used to automatically identify objects.
One example, of a practical application of this technology is in monitoring the feeding, drinking, and sleeping habits of ~nir-l S. The basic elements of such systems include a reader/transmitter, an antenna and a transponder. The reader/transmitter sends an electromagnetic charge wave through the antenna to the transponder, which uses this energy to transmit a radio frequency signal back through the antenna to the reader/transmitter. Typically, the signal includes an identification code unique to each transponder. In order to monitor the activities of large herds or confined groupings of ~n;r-ls~ one must be able to monitor multiple transponders in a relatively small area. With currently available technology it is impossible to read multiple transponders using one reader/transmitter. Each one of the multiple transponders uses the same frequency to transmit its unique identification code -back to the reader/transmitter, a single reader/transmitter is unable to decipher each individual identification code. In order to make systems with multiple transponders operational, multiple reader/transmitters are required, which makes such systems costly.
SUMMARY OF THE INVENTION
What is required is a passive transponder identification apparatus that is capable of reading multiple transponders.
According to the present invention there is provided a passive transponder identification apparatus which includes a plurality of transponders, a microprocessor and a single reader/transmitter coupled to the microprocessor. A plurality of antennas are provided with each antenna being coupled via a signal relay circuit with both the microprocessor and the reader/transmitter. Each one of the plurality of antennas is dedicated to one of the plurality of transponders. The microprocessor sequentially activates each one of the plurality of antennas via the signal relay circuit to send a signal from the single reader/transmitter. An exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, wherein:
FIGURE 1 is a schematic diagram of a passive transponder identification apparatus constructed in accordance with the teachings of the present invention.
216331 t _ DET~TT-~n DESCRIPTION OF THE rn~r-~KK~v EMBODIMENT
The preferred embodiment, a passive transponder identification apparatus generally identified by reference numeral 10, will now be described with reference to FIGURE 1.
Passive transponder identification apparatus 10 includes a plurality of transponders 12, a microprocessor 14, a single reader/transmitter 16 and a plurality of antennas 18. Each transponder 12 is secured to or implanted in an individual An;~l (not shown). The rem~ining portion of passive transponder identification apparatus 10 is positioned at a monitoring station. Reader/transmitter 16 is coupled to microprocessor 14. Each of antennas 18 are coupled via a signal relay circuit 20 with both microprocessor 14 and reader/transmitter 16. Each one of the plurality of antennas 18 is dedicated to one of the plurality of transponders 12.
Microprocessor sequentially activates each one of the plurality of antennas 18 via signal relay circuit 20 to send a signal from the single reader/transmitter 16 and receive a return signal from one of the transponders 12. An exchange of signals with each one of the plurality of transponders 12 occurs during the activating sequence when the one antenna 18 dedicated to that one transponder 12 is activated. With the passive transponder identification apparatus, as described, eighty or more transponders can be accommodated.
The best mode of the invention will now be described. In order to optimize reading distance attention it is preferred that each antenna 18 be wound such that the induction/capacitance introduced still allows for optimum resonance. It is also preferred that a minimllm of capacitance and inductance be introduced into signal relay circuit 20.
Preferably the circuit measures inductance and introduces the appropriate amount of capacitance. In order to reduce inductance, it is preferred that the traces be kept as parallel as possible. In order to reduce resistance, it is preferred -that multistrand wire be used. The read speed is linear to the number of antennas used. To optimize accuracy of duration measurements one needs to keep the reading speed as short as possible. Signal relay circuits 20 are designed so that will not switch between antennas while the signal relay circuit is active as, otherwise, inductance and capacitance will create a sparking action over the contacts that will adversely affect the longevity of end transistors. The circuit should be inactive for as short a time period as possible, without creating a no load situation. It is preferred that power loads be kept as low as possible so as not to interfere with other equipment.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
passive transponder identification apparatus NAMES OF INVENTORS:
Camiel Huisma Robert Edward Isted FIELD OF THE INVENTION
The present invention relates to a passive transponder identification apparatus and, in particular, one that is capable of being used with multiple transponders.
R~KGROUND OF THE INVENTION
Over the past twenty years passive radio frequency identification has been used to automatically identify objects.
One example, of a practical application of this technology is in monitoring the feeding, drinking, and sleeping habits of ~nir-l S. The basic elements of such systems include a reader/transmitter, an antenna and a transponder. The reader/transmitter sends an electromagnetic charge wave through the antenna to the transponder, which uses this energy to transmit a radio frequency signal back through the antenna to the reader/transmitter. Typically, the signal includes an identification code unique to each transponder. In order to monitor the activities of large herds or confined groupings of ~n;r-ls~ one must be able to monitor multiple transponders in a relatively small area. With currently available technology it is impossible to read multiple transponders using one reader/transmitter. Each one of the multiple transponders uses the same frequency to transmit its unique identification code -back to the reader/transmitter, a single reader/transmitter is unable to decipher each individual identification code. In order to make systems with multiple transponders operational, multiple reader/transmitters are required, which makes such systems costly.
SUMMARY OF THE INVENTION
What is required is a passive transponder identification apparatus that is capable of reading multiple transponders.
According to the present invention there is provided a passive transponder identification apparatus which includes a plurality of transponders, a microprocessor and a single reader/transmitter coupled to the microprocessor. A plurality of antennas are provided with each antenna being coupled via a signal relay circuit with both the microprocessor and the reader/transmitter. Each one of the plurality of antennas is dedicated to one of the plurality of transponders. The microprocessor sequentially activates each one of the plurality of antennas via the signal relay circuit to send a signal from the single reader/transmitter. An exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, wherein:
FIGURE 1 is a schematic diagram of a passive transponder identification apparatus constructed in accordance with the teachings of the present invention.
216331 t _ DET~TT-~n DESCRIPTION OF THE rn~r-~KK~v EMBODIMENT
The preferred embodiment, a passive transponder identification apparatus generally identified by reference numeral 10, will now be described with reference to FIGURE 1.
Passive transponder identification apparatus 10 includes a plurality of transponders 12, a microprocessor 14, a single reader/transmitter 16 and a plurality of antennas 18. Each transponder 12 is secured to or implanted in an individual An;~l (not shown). The rem~ining portion of passive transponder identification apparatus 10 is positioned at a monitoring station. Reader/transmitter 16 is coupled to microprocessor 14. Each of antennas 18 are coupled via a signal relay circuit 20 with both microprocessor 14 and reader/transmitter 16. Each one of the plurality of antennas 18 is dedicated to one of the plurality of transponders 12.
Microprocessor sequentially activates each one of the plurality of antennas 18 via signal relay circuit 20 to send a signal from the single reader/transmitter 16 and receive a return signal from one of the transponders 12. An exchange of signals with each one of the plurality of transponders 12 occurs during the activating sequence when the one antenna 18 dedicated to that one transponder 12 is activated. With the passive transponder identification apparatus, as described, eighty or more transponders can be accommodated.
The best mode of the invention will now be described. In order to optimize reading distance attention it is preferred that each antenna 18 be wound such that the induction/capacitance introduced still allows for optimum resonance. It is also preferred that a minimllm of capacitance and inductance be introduced into signal relay circuit 20.
Preferably the circuit measures inductance and introduces the appropriate amount of capacitance. In order to reduce inductance, it is preferred that the traces be kept as parallel as possible. In order to reduce resistance, it is preferred -that multistrand wire be used. The read speed is linear to the number of antennas used. To optimize accuracy of duration measurements one needs to keep the reading speed as short as possible. Signal relay circuits 20 are designed so that will not switch between antennas while the signal relay circuit is active as, otherwise, inductance and capacitance will create a sparking action over the contacts that will adversely affect the longevity of end transistors. The circuit should be inactive for as short a time period as possible, without creating a no load situation. It is preferred that power loads be kept as low as possible so as not to interfere with other equipment.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (2)
1. A passive transponder identification apparatus, comprising:
a plurality of transponders;
a microprocessor;
a single reader/transmitter coupled to the microprocessor;
a plurality of antennas each antenna being coupled via a signal relay circuit with both the microprocessor and the reader/transmitter, each one of the plurality of antennas being dedicated to one of the plurality of transponders;
the microprocessor sequentially activating each one of the plurality of antennas via the signal relay circuit to send a signal from the single reader/transmitter such that an exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
a plurality of transponders;
a microprocessor;
a single reader/transmitter coupled to the microprocessor;
a plurality of antennas each antenna being coupled via a signal relay circuit with both the microprocessor and the reader/transmitter, each one of the plurality of antennas being dedicated to one of the plurality of transponders;
the microprocessor sequentially activating each one of the plurality of antennas via the signal relay circuit to send a signal from the single reader/transmitter such that an exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
2. A method of having a single reader/transmitter read a plurality of passive transponders, comprising the steps of:
coupling the single reader/transmitter to a microprocessor;
connecting a plurality of antennas via a signal relay circuit with both the microprocessor and the single reader/transmitter, each one of the plurality of antennas being dedicated to one of a plurality of transponders, the microprocessor sequentially activating each one of the plurality of antennas via the signal relay circuit to send a signal from the single reader/transmitter such that an exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
coupling the single reader/transmitter to a microprocessor;
connecting a plurality of antennas via a signal relay circuit with both the microprocessor and the single reader/transmitter, each one of the plurality of antennas being dedicated to one of a plurality of transponders, the microprocessor sequentially activating each one of the plurality of antennas via the signal relay circuit to send a signal from the single reader/transmitter such that an exchange of signals with each one of the plurality of transponders occurs during the activating sequence when the one antenna dedicated to that one transponder is activated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2163311 CA2163311A1 (en) | 1995-11-20 | 1995-11-20 | Passive transponder identification apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2163311 CA2163311A1 (en) | 1995-11-20 | 1995-11-20 | Passive transponder identification apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2163311A1 true CA2163311A1 (en) | 1997-05-21 |
Family
ID=4156998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2163311 Abandoned CA2163311A1 (en) | 1995-11-20 | 1995-11-20 | Passive transponder identification apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2163311A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004064506A1 (en) * | 2003-01-24 | 2004-08-05 | Aleis Trakit Pty Ltd | Identifying apparatus |
| EP1662423A2 (en) * | 1997-08-28 | 2006-05-31 | Supersensor (Proprietary) Limited | Reader arrangement for an electronic identification system |
-
1995
- 1995-11-20 CA CA 2163311 patent/CA2163311A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1662423A2 (en) * | 1997-08-28 | 2006-05-31 | Supersensor (Proprietary) Limited | Reader arrangement for an electronic identification system |
| EP1662423A3 (en) * | 1997-08-28 | 2006-08-02 | Supersensor (Proprietary) Limited | Reader arrangement for an electronic identification system |
| WO2004064506A1 (en) * | 2003-01-24 | 2004-08-05 | Aleis Trakit Pty Ltd | Identifying apparatus |
| US7679517B2 (en) | 2003-01-24 | 2010-03-16 | Aleis Trakit Pty Ltd | Identifying apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0899677B1 (en) | Reader arrangement for an electronic identification system | |
| EP2198388B1 (en) | A radio frequency identification reader/writer and a method for implementing antenna switching | |
| US5194860A (en) | Radio telemetry systems with channel selection | |
| EP1904948B1 (en) | Ramped interrogation power levels | |
| US5850181A (en) | Method of transporting radio frequency power to energize radio frequency identification transponders | |
| EP1845631B1 (en) | Rfid communication control method and rfid system using the same | |
| US7385511B2 (en) | Carrierless RFID system | |
| US20040160310A1 (en) | Radio frequency identification device | |
| CA2492062A1 (en) | Pulsed power method for increased read range for a radio frequency identification reader | |
| US20060145815A1 (en) | System and method for relaying RFID data | |
| WO2000043803A3 (en) | Method of detecting a radio frequency identification device | |
| MY114076A (en) | Modulation compensated clamp circuit | |
| CA2265819A1 (en) | An apparatus for data communication and deactivation of electronic article surveillance tags | |
| EP1069526A3 (en) | Mobile body discrimination apparatus for rapidly acquiring respective data sets transmitted through modulation of reflected radio waves by transponders which are within a communication region of an interrogator apparatus | |
| WO2002014898A3 (en) | Near object detection system | |
| KR20020087470A (en) | Signalling system and a transponder for use in the system | |
| WO2005020444A2 (en) | System and method for optimizing power usage in a radio frequency communication device | |
| EP1614268B1 (en) | A transponder reader capable of reading transponders having different signalling protocols | |
| DE19717505A1 (en) | Transponder communication system for identification e.g. of livestock | |
| WO2004095353A3 (en) | Method and device for the detection and identification of objects, secure containers and systems which are provided with said device, and objects adapted for same | |
| US20050179521A1 (en) | Frequency hopping method for RFID tag | |
| CN201084278Y (en) | A radio-frequency identification device of long-distance location management | |
| KR20100044781A (en) | Method and device for the contact-free transmission of data from and/or to a plurality of data or information carriers, preferably in the form of reid tags | |
| CA2322152A1 (en) | Synchronization method for rfid system including tags having different memory sizes | |
| CA2163311A1 (en) | Passive transponder identification apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20010409 |