DE3805343A1 - COMMUNICATION SYSTEM - Google Patents

COMMUNICATION SYSTEM

Info

Publication number
DE3805343A1
DE3805343A1 DE19883805343 DE3805343A DE3805343A1 DE 3805343 A1 DE3805343 A1 DE 3805343A1 DE 19883805343 DE19883805343 DE 19883805343 DE 3805343 A DE3805343 A DE 3805343A DE 3805343 A1 DE3805343 A1 DE 3805343A1
Authority
DE
Germany
Prior art keywords
harmonic
signal
frequency
communication system
transmitter
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.)
Withdrawn
Application number
DE19883805343
Other languages
German (de)
Inventor
Niels Moelgaard
Knud Christian Claus Fabrin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SILKEBORG ELECT IDENT SYST
Original Assignee
SILKEBORG ELECT IDENT SYST
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SILKEBORG ELECT IDENT SYST filed Critical SILKEBORG ELECT IDENT SYST
Publication of DE3805343A1 publication Critical patent/DE3805343A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K11/00—Marking of animals
    • A01K11/006—Automatic identification systems for animals, e.g. electronic devices, transponders for animals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
    • B61L25/02—Indicating or recording positions or identities of vehicles or trains
    • B61L25/04—Indicating or recording train identities
    • B61L25/045—Indicating or recording train identities using reradiating tags
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
    • G01S13/751—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal
    • G01S13/758—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal using a signal generator powered by the interrogation signal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G06K19/0724—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs the arrangement being a circuit for communicating at a plurality of frequencies, e.g. for managing time multiplexed communication over at least two antennas of different types
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Environmental Sciences (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Birds (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Artificial Intelligence (AREA)
  • Mechanical Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Television Systems (AREA)
  • Radio Relay Systems (AREA)
  • Noise Elimination (AREA)

Abstract

In a communication system with a transmitter, a transponder transmitting a coded identification signal, and a receiver receiving and recording the coded signal, the transponder performs a frequency conversion prior to the transmission of the coded identification signal. According to the invention the transponder transmits a signal of a frequency in the range of the n th and the (n + 1) th harmonic of the signal received e.g. the 91 DIVIDED 2th harmonic. As a result interference with the harmonics generated by the surroundings under particular circumstances is avoided. A ROM (4) is operated by a supply derived from the received transmission at the transponder. It serves to input data to a modulator (6) modulating the divided-and-multiplied input carrier frequency to produce a data-coded output. <IMAGE>

Description

Die Erfindung betrifft eine Kommunikationsanlage mit einem Sender, einem Antwortsender zum Aussenden eines kodierten Identifikationssignals, und einem Empfänger zum Empfangen und Registrieren des kodierten Signals, wobei der Antwort­ sender vor dem Aussenden des kodierten Identifikationssi­ gnals eine Frequenzumwandlung durchführt.The invention relates to a communication system with a Transmitter, a responder for sending a coded Identification signal, and a receiver for receiving and registering the encoded signal, the response transmitter before sending the coded identification signal gnals performs a frequency conversion.

Der Antwortsender ist beispielsweise zum Erzeugen der 9ten harmonischen Oberwelle des vom Sender empfangenen Signals eingerichtet. Unter besonderen Umständen kann aber auch die Umgebung ein Signal mit einer Frequenz entsprechend der 9ten harmonischen Oberwelle erzeugen und somit das zu detektierende Signal verschleiern oder überlagern.The responder is, for example, for generating the 9th harmonic of the signal received by the transmitter set up. In special circumstances it can also the environment a signal with a frequency accordingly of the 9th harmonic and thus the obscure or overlay the detection signal.

Gemäß der Erfindung sendet der Antwortsender ein Signal mit einer Frequenz zwischen der n -ten und der (n +1)ten harmonischen Oberwelle des empfangenen Signals aus.According to the invention, the responder sends out a signal with a frequency between the nth and ( n +1) th harmonic of the received signal.

Hierdurch wird eine Überlagerung der von der Umgebung er­ zeugten Signale vermieden.This will overlay it from the environment generated signals avoided.

Das vom Antwortsender ausgesandte Signal weist vorteilhaft eine Frequenz von (n + ½) multipliziert mit der Frequenz des empfangenen Signals auf. The signal sent by the responder advantageously has a frequency of ( n + ½) multiplied by the frequency of the received signal.

Gemäß einem bevorzugten Ausführungsbeispiel kann der Ant­ wortsender die Frequenz des empfangenen Signals halbieren und die halbe Frequenz mit einer ungeraden Zahl mittels einer Multiplizierschaltung multiplizieren.According to a preferred embodiment, the Ant word transmitter halve the frequency of the received signal and half the frequency with an odd number using multiply by a multiplier.

Außerdem kann der Antwortsender gemäß der Erfindung die Frequenz des empfangenen Signals halbieren und dieses Signal mit der n -ten harmonischen Oberwelle mischen.In addition, the responder according to the invention can halve the frequency of the received signal and mix this signal with the nth harmonic.

Ferner kann der Antwortsender zum Erzeugen der n -ten har­ monischen Oberwelle die (n - p)te harmonische Oberwelle mit der p -ten harmonischen Oberwelle für einen oder mehrere Werte von p mischen und die erzielten Werte der n -ten harmonischen Oberwelle addieren, wobei die Endleistung der n -ten harmo­ nischen Oberwelle erhöht wird.Further, the response transmitter for generating the n th can har monic harmonic the (n - p) th harmonic wave with the p th harmonic for one or more values mix of p and add the obtained values of the n th harmonic, and the final output of the n th harmonic harmonious African is increased.

Schließlich kann der Antwortsender gemäß der Erfindung zum Erzeugen der n -ten harmonischen Oberwelle die (n - p)te harmonische Oberwelle mit der p -ten harmonischen Oberwelle für einen oder mehrere Werte von p mischen und die erzielten Werte der n -ten harmonischen Oberwelle addieren, wobei ein noch größerer Teil als bisher der empfangenen Leistung zum Erzeugen der n -ten harmonischen Oberwelle ausnutzt wird.Finally, the responder according to the invention for generating the n th harmonic of the (n - p) th harmonic wave with the p th harmonic for one or more values mix of p and add the obtained values of the n th harmonic , with an even larger portion than previously received power being used to generate the nth harmonic.

Die Erfindung wird nachstehend an Hand der Zeichnung näher erläutert. Es zeigtThe invention will now be described with reference to the drawing explained. It shows

Fig. 1 einen Antwortsender für eine Kommunikationsanlage gemäß der Erfindung, Fig. 1 a response transmitter for a communications system according to the invention,

Fig. 2 ein zweites Ausführungsbeispiel des Antwortsenders und Fig. 2 shows a second embodiment of the responder and

Fig. 3 ein drittes Ausführungsbeispiel des Antwortsenders. Fig. 3 shows a third embodiment of the responder.

Bei dem in Fig. 1 dargestellten Antwortsender für eine Kommunikationsanlage gemäß der Erfindung wird das empfangene Signal mit einer Frequenz von 27,12 MHz mittels eines Kon­ densators 1 zum Erzeugen einer Gleichstromspannung von 3-7 V gleichgerichtet und geglättet. Die Gleichstromspannung wird u. a. zum Antreiben eines Frequenzteilers 2 und eines ROMs 4 mit einem Identifikationskode (Manchesterkode) ange­ wendet. Das empfangene Signal wird ferner durch den Fre­ quenzteiler 2 an einen Filter 5 gesandt, der die (2 n + 1)te harmonische Oberwelle des Signals mit der halben Frequenz herausfiltert, wobei ein Signal der Frequenz (n + ½) multipliziert mit der Frequenz des empfangenen Signals entsteht. Dieses Signal wird mittels des Identifikations­ kodes bei 6 moduliert und ausgesandt. Ein besonderer Vorteil einer solchen Kommunikationsanlage ist, daß das vom Antwort­ sender ausgesandte Signal nicht von den harmonischen Ober­ wellen, die gegebenenfalls von der Umgebung erzeugt werden, gestört wird, wobei eine hohe Demodulationssicherheit er­ reicht wird.In the responder shown in Fig. 1 for a communication system according to the invention, the received signal at a frequency of 27.12 MHz is rectified and smoothed by means of a capacitor 1 for generating a DC voltage of 3-7 V. The DC voltage is used, among other things, to drive a frequency divider 2 and a ROM 4 with an identification code (Manchester code). The received signal is also sent through the frequency divider 2 to a filter 5 , which filters out the (2 n + 1) th harmonic of the signal at half the frequency, a signal of the frequency ( n + ½) multiplied by the frequency of the received signal arises. This signal is modulated by means of the identification code at 6 and transmitted. A particular advantage of such a communication system is that the signal emitted by the response transmitter is not disturbed by the harmonic waves that may be generated by the environment, whereby a high level of demodulation security is achieved.

Bei dem in Fig. 2 gezeigten Ausführungsbeispiel wird das empfangene Signal von 27,12 MHz zum Erzeugen der notwendigen Gleichstromspannung ebenfalls gleichgerichtet und geglättet. In dieser Schaltung wird die Frequenz von (n + ½) multi­ pliziert mit der Frequenz des empfangenen Signals aber dadurch erzeugt, daß man die n -te harmonische Oberwelle des empfangenen Signals, wie beispielsweise die 9te harmonische Oberwelle, mit einem Signal der halben Frequenz mischt. Eine solche Schaltung ist leichter ausführbar, und die n -te harmonische Oberwelle weist üblicherweise eine höhere Am­ plitude auf als die (2 n +1)te harmonische Oberwelle, wobei eine hohe Endleistung erreicht wird.In the exemplary embodiment shown in FIG. 2, the received signal of 27.12 MHz for generating the necessary DC voltage is also rectified and smoothed. In this circuit, the frequency of ( n + ½) is multiplied with the frequency of the received signal but is generated by mixing the nth harmonic of the received signal, such as the 9th harmonic, with a signal of half the frequency . Such a circuit is easier to implement, and the nth harmonic usually has a higher amplitude than the (2 n +1) th harmonic, with a high final output being achieved.

Gemäß einem dritten Ausführungsbeispiel wird das empfangene Signal von 27,12 MHz zum Erzeugen der notwendigen Gleich­ stromspannung ebenfalls gleichgerichtet und geglättet. Das empfangene Signal wird direkt an einen Frequenzteiler 2 zum Erzeugen eines Signals mit halber Frequenz gesandt. Das empfangene Signal wird ferner an eine nicht lineare Einheit 3 gesandt, wobei man mittels Filter die 1. und die 8. harmonische Oberwelle herausfiltert und diese Signal­ komponenten zum Erzeugen der 9. harmonischen Oberwelle bei 11 mischt, die 2. und 7. harmonische Oberwelle heraus­ filtert und diese Signalkomponenten zum Erzeugen der 9. harmonischen Oberwelle bei 12 mischt, die 3. und die 6. harmonische Oberwelle herausfiltert und diese Signalkompo­ nenten zum Erzeugen der 9. harmonischen Oberwelle bei 13 mischt, die 4. und die 5. harmonische Oberwelle heraus­ filtert und diese Signalkomponenten zum Erzeugen der 9. harmonischen Oberwelle bei 14 mischt, die 9. harmonische Oberwelle herausfiltert. Die Signale mit einer Frequenz entsprechend der 9. harmonischen Oberwelle werden addiert und bei 16 mit dem Signals mit halber Frequenz gemischt, wobei ein Signal mit einer Frequenz von (9 + ½) multipli­ ziert mit der Frequenz des empfangenen Signals entsteht. Hierdurch wird eine hohe Endleistung erreicht. Es ist auch möglich die hohen harmonischen Oberwellen herauszufiltern und diese voneinander zu subtrahieren, wobei die Endleistung weiter erhöht wird.According to a third embodiment, the received signal of 27.12 MHz for generating the necessary DC voltage is also rectified and smoothed. The received signal is sent directly to a frequency divider 2 for generating a half frequency signal. The received signal is also sent to a non-linear unit 3 , filtering out the 1st and 8th harmonics using a filter and mixing these signal components to generate the 9th harmonic at 11 , the 2nd and 7th harmonics filters out and mixes these signal components for generating the 9th harmonic at 12 , filters out the 3rd and 6th harmonic and mixes these signal components for generating the 9th harmonic at 13, mixes the 4th and 5th harmonic filters out and mixes these signal components to generate the 9th harmonic at 14 , filters out the 9th harmonic. The signals with a frequency corresponding to the 9th harmonic are added and mixed at 16 with the half-frequency signal, a signal with a frequency of (9 + ½) multiplied by the frequency of the received signal. This achieves a high final output. It is also possible to filter out the high harmonic waves and subtract them from each other, increasing the final power even further.

Der Sender ist ein konventioneller HF-Sender, der gegebenen­ falls impulsmoduliert ist.The transmitter is a conventional RF transmitter, given the if pulse modulated.

Der Empfänger ist ein konventioneller Empfänger, der ferner einen Dekoder zum Deschiffrieren des Identifikationskodes des betreffenden Antwortsenders aufweist.The receiver is a conventional receiver, which is further a decoder for deciphering the identification code of the responder concerned.

Die Anlage ist beispielsweise für den Erhalt statistischer Informationen über das Verhalten von Schweinen anwendbar. Ein Fühler mit einer bestimmten Kodenummer ist dann im Ohr jedes Schweines befestigt. Dieser Fühler registriert jedes Mal das Schwein in die Nähe eines Senders/Empfängers kommt. Der Sender/Empfänger ist mit einer zentralen Datenverar­ beitungseinheit verbunden, die die empfangenen Signale registriert. Ein eventuelles Registrieren anderer Parameter­ werte, wie beispielsweise die Körpertemperatur des betref­ fenden Schweins, kann dann gleichzeitig geschehen.For example, the facility is statistical for obtaining Information about the behavior of pigs applicable. A sensor with a certain code number is then in the ear every pig attached. This sensor registers everything Sometimes the pig comes close to a transmitter / receiver. The transmitter / receiver is with a central data processing processing unit connected to the received signals registered. A possible registration of other parameters values, such as the body temperature of the subject fenden pig, can then happen at the same time.

Die Kommunikationsanlage gemäß der Erfindung läßt sich viel­ fach variieren, ohne daß man dabei von der Idee der Erfin­ dung abweicht. Die einzige Bedingung ist, daß der Antwort­ sender ein Signal mit einer Frequenz zwischen der n -ten und der (n +1)ten harmonischen Oberwelle des empfangenen Si­ gnals aussendet, so daß eine Überlagerung von den Signalen, die von der Umgebung erzeugt werden, nicht vorkommt.The communication system according to the invention can vary many times without deviating from the idea of the inven tion. The only condition is that the response transmitter sends a signal with a frequency between the nth and the ( n +1) th harmonic of the received signal, so that a superposition of the signals generated by the environment, does not occur.

Claims (6)

1. Kommunikationsanlage mit einem Sender, einem Anwortsender zum Aussenden eines kodierten Iden­ tifikationssignals, und einem Empfänger zum Emp­ fangen und Registrieren des kodierten Signals, wobei der Antwortsender vor dem Aussenden des kodierten Identifikationssignals eine Frequenzum­ wandlung durchführt, dadurch gekenn­ zeichnet, daß der Antwortsender ein Signal mit einer Frequenz zwischen der n -ten und der (n +1)ten harmonischen Oberwelle des empfangenen Signals aussendet.1. Communication system with a transmitter, a response transmitter for sending a coded identification signal, and a receiver for receiving and registering the coded signal, the responder performing a frequency conversion before sending the coded identification signal, characterized in that the responder is one Signal with a frequency between the nth and ( n +1) th harmonic of the received signal. 2. Kommunikationsanlage nach Anspruch 1, dadurch gekennzeichnet, daß das vom Ant­ wortsender ausgesandte Signal eine Frequenz von (n + ½) multipliziert mit der Frequenz des empfan­ genen Signals aufweist.2. Communication system according to claim 1, characterized in that the signal sent by the response transmitter has a frequency of ( n + ½) multiplied by the frequency of the received signal. 3. Kommunikationsanlage nach Anspruch 2, dadurch gekennzeichnet, daß der Antwort­ sender die Frequenz des empfangenen Signals hal­ biert und die halbe Frequenz mit einer ungeraden Zahl mittels einer Multiplizierschaltung multi­ pliziert.3. Communication system according to claim 2, characterized characterized that the answer transmit the frequency of the received signal hal beers and half the frequency with an odd Number by means of a multiplier circuit multi plicated. 4. Kommunikationsanlage nach Anlage 2, dadurch gekennzeichnet, daß der Antwort­ sender die Frequenz des empfangenen Signals hal­ biert und dieses Signal mit der n -ten harmonischen Oberwelle mischt.4. Communication system according to Appendix 2, characterized in that the response transmitter halts the frequency of the received signal and mixes this signal with the nth harmonic. 5. Kommunikationsanlage nach Anspruch 4, dadurch gekennzeichnet, daß der Antwort­ sender zum Erzeugen der n -ten harmonischen Ober­ welle die (n - p)te harmonische Oberwelle mit der p -ten harmonischen Oberwelle mischt.5. Communication system according to claim 4, characterized in that the response transmitter for generating the n -th harmonic harmonic mixes the ( n - p ) th harmonic with the p- th harmonic. 6. Kommunikationsanlage nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Antwortsender zum Erzeugen der n -ten harmonischen Oberwelle die (n - p)te harmonische Oberwelle mit der p -ten harmonischen Oberwelle für einen oder mehrere Werte von p mischt und die erzielten Werte der n -ten harmonischen Oberwelle addiert.6. Communication system according to claim 4 or 5, characterized in that the responder for generating the n th harmonic of the (n - p) th harmonic wave with the p th harmonic for one or more values mixes of p and the obtained Values of the nth harmonic harmonic added.
DE19883805343 1987-03-03 1988-02-20 COMMUNICATION SYSTEM Withdrawn DE3805343A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK110387A DK110387A (en) 1987-03-03 1987-03-03 COMMUNICATION SYSTEM

Publications (1)

Publication Number Publication Date
DE3805343A1 true DE3805343A1 (en) 1988-09-15

Family

ID=8101033

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19883805343 Withdrawn DE3805343A1 (en) 1987-03-03 1988-02-20 COMMUNICATION SYSTEM

Country Status (6)

Country Link
JP (1) JPS63229924A (en)
DE (1) DE3805343A1 (en)
DK (1) DK110387A (en)
GB (1) GB2202108A (en)
NL (1) NL8800514A (en)
SE (1) SE8800724L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0553713A1 (en) * 1992-01-31 1993-08-04 Shinko Electric Co. Ltd. Radio communication system
EP0592224A1 (en) * 1992-10-07 1994-04-13 Westinghouse Electric Corporation Dual resonant antenna circuit for RF tags
DE10021394A1 (en) * 2000-05-03 2001-11-15 Sab Service Und Fertigung Von Automatic door for passing animal through has detector of identity device worn by animal within defined range of door, actuator for opening door in response to presence of identity device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464844B (en) * 1989-08-23 1991-06-17 Henoch Bengt PROCEDURE TO CONTACT TRANSFER TRANSFER INFORMATION BETWEEN A TRANSMITTER / RECEIVER UNIT AND A TRANSPONDER
US5477215A (en) * 1993-08-02 1995-12-19 At&T Corp. Arrangement for simultaneously interrogating a plurality of portable radio frequency communication devices
CA2143144C (en) * 1994-03-03 1999-09-28 James Gifford Evans Modulated backscatter wireless communication system having an extended range
FR2723238B1 (en) * 1994-07-27 1996-09-13 Suisse Electronique Microtech COMMUNICATION SYSTEM BETWEEN A BASE STATION AND A PASSIVE TRANSPONDER
US6650230B1 (en) 1998-11-19 2003-11-18 Ncr Corporation Modulated backscatter wireless communication system having an extended range
DE102005061438A1 (en) * 2005-12-22 2007-07-05 Atmel Germany Gmbh Transponder and method for operating a transponder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3137847A (en) * 1959-11-04 1964-06-16 Link Aviation Inc Signalling system
GB1085704A (en) * 1964-10-30 1967-10-04 Nat Res Dev Apparatus for detecting an object
GB1297279A (en) * 1969-07-09 1972-11-22
GB1257692A (en) * 1969-07-28 1971-12-22

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0553713A1 (en) * 1992-01-31 1993-08-04 Shinko Electric Co. Ltd. Radio communication system
EP0592224A1 (en) * 1992-10-07 1994-04-13 Westinghouse Electric Corporation Dual resonant antenna circuit for RF tags
DE10021394A1 (en) * 2000-05-03 2001-11-15 Sab Service Und Fertigung Von Automatic door for passing animal through has detector of identity device worn by animal within defined range of door, actuator for opening door in response to presence of identity device

Also Published As

Publication number Publication date
JPS63229924A (en) 1988-09-26
DK110387A (en) 1988-09-04
NL8800514A (en) 1988-10-03
DK110387D0 (en) 1987-03-03
SE8800724D0 (en) 1988-03-02
GB2202108A (en) 1988-09-14
GB8803870D0 (en) 1988-03-23
SE8800724L (en) 1988-09-04

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