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1. (WO1992010765) MICROWAVE IDENTIFICATION SYSTEM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/010765 International Application No.: PCT/NL1991/000254
Publication Date: 25.06.1992 International Filing Date: 06.12.1991
IPC:
G01S 13/75 (2006.01) ,G06K 7/10 (2006.01) ,G06K 19/07 (2006.01)
G PHYSICS
01
MEASURING; TESTING
S
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
13
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
74
Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
75
using transponders powered from received waves, e.g. using passive transponders
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
K
RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7
Methods or arrangements for sensing record carriers
10
by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
K
RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
19
Record carriers for use with machines and with at least a part designed to carry digital markings
06
characterised by the kind of the digital marking, e.g. shape, nature, code
067
Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards
07
with integrated circuit chips
Applicants:
N.V. NEDERLANDSCHE APPARATENFABRIEK NEDAP [NL/NL]; Oude Winterswijkseweg 7 NL-7141 DE Groenlo, NL (AllExceptUS)
VAN ZON, Bernardus, Clemens, Maria [NL/NL]; NL (UsOnly)
Inventors:
VAN ZON, Bernardus, Clemens, Maria; NL
Agent:
SMULDERS, Th., A., H., J.; Vereenigde Octrooibureaux Nieuwe Parklaan 97 NL-2587 BN The Hague, NL
Priority Data:
900268306.12.1990NL
Title (EN) MICROWAVE IDENTIFICATION SYSTEM
(FR) SYSTEME D'IDENTIFICATION A MICRO-ONDES
Abstract:
(EN) A microwave identification system comprising a transmitter/receiver provided with an antenna system, a plurality of responders provided with an antenna system, the communication between transmitter/receiver and responders taking place by means of electromagnetic waves in the microwave range, wherein the antenna system of the responders comprises an array with at least two antenna elements (12, 13) interconnected via a modulation device (14, 15, 16) and, for obtaining a retroreflective effect, the signal generated in an interrogation field by one of the two antenna elements is applied to the modulation device and, after being modulated with a code that is characteristic for the responder, is applied to the other antenna element to be radiated by the other antenna element.
(FR) Système d'identification à micro-ondes comportant un émetteur-récepteur équipé d'un système d'antenne, et une pluralité de répondeurs équipés d'un système d'antenne, la communication entre l'émetteur-récepteur et les répondeurs se déroulant à l'aide d'ondes électromagnétiques comprises dans la plage des micro-ondes. Le système d'antenne des répondeurs comporte un réseau doté d'au moins deux éléments d'antenne (12, 13) raccordés l'un à l'autre par l'intermédiaire d'un dispositif de modulation (14, 15, 16). Afin d'obtenir un effet de rétroréflextion, on applique au dispositif de modulation le signal généré dans un champ d'interrogation par l'un des deux éléments d'antenne et, une fois qu'il est modulé avec un code caractéristique du répondeur, on applique ledit signal à l'autre élément d'antenne devant subir le rayonnement de l'autre élément d'antenne.
Designated States: US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, MC, NL, SE)
Publication Language: English (EN)
Filing Language: Dutch (NL)
Also published as:
EP0574399US5361071