Coupling of RFID straps to antennae using a combination of magnetic and electric fields
First Claim
1. An RFID device, comprising:
- an antenna;
an RFID strap, including a chip attached to the strap, the strap is coupled to the antenna by a combination of magnetic and electric fields; and
the strap comprises a strap conductor that includes a loop and an extension, the extension overlapping and crossing the antenna and the strap conductor has a center line extending generally in a direction between the RFID chip and the antenna;
where the RFID strap is encapsulated to provide a robust structure.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
18 Claims
-
1. An RFID device, comprising:
-
an antenna; an RFID strap, including a chip attached to the strap, the strap is coupled to the antenna by a combination of magnetic and electric fields; and the strap comprises a strap conductor that includes a loop and an extension, the extension overlapping and crossing the antenna and the strap conductor has a center line extending generally in a direction between the RFID chip and the antenna; where the RFID strap is encapsulated to provide a robust structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of coupling an RFID strap of an RFID device to an antenna of the RFID device, comprising:
-
coupling the RFID strap to the antenna by a magnetic field and the RFID strap includes an RFID chip; and coupling the RFID strap to the antenna by an electric field such that the RFID strap comprises a strap conductor that includes a loop and an extension such that the loop section is positioned generally adjacent to the antenna and the strap conductor has a center line extending generally in a direction between a RFID chip and the antenna. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification