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1. (WO2018102395) COUPLING OF RFID STRAPS TO ANTENNAE USING A COMBINATION OF MAGNETIC AND ELECTRIC FIELDS

Pub. No.:    WO/2018/102395    International Application No.:    PCT/US2017/063676
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Thu Nov 30 00:59:59 CET 2017
IPC: H01Q 1/22
H01Q 9/16
G06K 19/077
Applicants: AVERY DENNISON RETAIL INFORMATION SERVICES, LLC
Inventors: FORSTER, Ian J.
Title: COUPLING OF RFID STRAPS TO ANTENNAE USING A COMBINATION OF MAGNETIC AND ELECTRIC FIELDS
Abstract:
An RFID device includes an antenna and an RFID strap. The RFID strap is coupled to the antenna by a combination of magnetic and electric fields. The RFID strap includes an RFID chip and a strap conductor coupling the RFID chip to the antenna. The strap conductor has a loop section positioned generally adjacent to the antenna to magnetically couple the RFID strap to the antenna. The strap conductor also has an extension section overlapping and crossing the antenna to electrically couple the RFID strap to the antenna. By adjusting the size of the RFID strap, the configuration of the RFID strap, the degree of overlap between the extension section and the antenna, and/or the angular orientation of the RFID strap with respect to the antenna, the impedance transformation between the RFID chip and the antenna may be varied to better match the RFID chip and the antenna.