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1. WO2020109819 - SYSTEMS AND METHODS FOR READING RFID TAGS

Publication Number WO/2020/109819
Publication Date 04.06.2020
International Application No. PCT/GB2019/053387
International Filing Date 29.11.2019
IPC
G06K 7/00 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers
G06K 7/10 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
H04B 5/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
5Near-field transmission systems, e.g. inductive loop type
H04B 7/06 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
02Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas
04using two or more spaced independent antennas
06at the transmitting station
CPC
G06K 7/0008
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns
0008General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
G06K 7/10029
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
10009sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
10019resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
10029the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
G06K 7/10079
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
10009sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
10019resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
10079the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
G06K 7/10089
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
10009sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
10019resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
10079the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
10089the interrogation device using at least one directional antenna or directional interrogation field to resolve the collision
G06K 7/10128
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
10009sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
10118the sensing being preceded by at least one preliminary step
10128the step consisting of detection of the presence of one or more record carriers in the vicinity of the interrogation device
G06K 7/10356
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
10009sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
10316using at least one antenna particularly designed for interrogating the wireless record carriers
10356using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
Applicants
  • PERVASID LIMITED [GB]/[GB]
Inventors
  • SITHAMPARANATHAN, Sabesan
  • WHITE, Ian
  • CRISP, Michael
  • PENTY, Richard Vincent
  • NEUHAUS, Martin
Agents
  • MARKS & CLERK LLP
Priority Data
1819591.730.11.2018GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEMS AND METHODS FOR READING RFID TAGS
(FR) SYSTÈMES ET PROCÉDÉS DE LECTURE D'ÉTIQUETTES RFID
Abstract
(EN)
An RFID system comprises an array of antennas each configured to emit a plurality of beams in different directions. The beams of each pair of adjacent antennas are directed towards one another and overlap. A pair of adjacent antennas transmits simultaneously and the overlapping beams interfere to create an interference pattern. An RFID reader controls the relative phase and/or frequency of the beams to move the interference pattern to read an RFID tag within the moving pattern. As the chance of a RFID tag responding to an emitted beam generally increases with signal strength of the reader beam an area of constructive interference means that RFID tags in that region are more likely to respond to the signal. The system can cover a large proportion of the area below ceiling-mounted antennas, where cover generally means that RFID tags in that area will be successfully read.
(FR)
Selon l'invention, un système RFID comprend un réseau d'antennes configurées chacune de sorte à émettre une pluralité de faisceaux dans des directions différentes. Les faisceaux de chaque paire d'antennes adjacentes sont dirigés les uns vers les autres et se chevauchent. Une paire d'antennes adjacentes transmet simultanément et les faisceaux se chevauchant interfèrent afin de créer un motif d'interférence. Un lecteur RFID commande la phase et/ou la fréquence relative des faisceaux pour déplacer le motif d'interférence de manière à lire une étiquette RFID dans motif qui se déplace. Étant donné que la probabilité qu'une étiquette RFID réponde à un faisceau émis augmente généralement avec une intensité de signal du faisceau de lecteur, une zone d'interférence constructive signifie que des étiquettes RFID dans cette région sont plus susceptibles de répondre au signal. Le système peut couvrir une grande proportion de la zone au-dessous d'antennes montées au plafond, la couverture signifiant généralement que des étiquettes RFID dans cette zone seront lues avec succès.
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