RFID foldable antenna

Patent metadata

Field	Value
Publication number	US-12542365-B2
Application number	US-202318172537-A
Country	US
Kind code	B2
Filing date	Feb 22, 2023
Priority date	Feb 22, 2023
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

An RFID antenna having two flexible elongated conductive transmission lines with coplanar RFID energy radiation perturbations distributed along the transmission lines, the transmission lines and perturbations being folded between ends of the transmission lines so that the transmission lines of one fold overlie and are adjacent the transmission lines of the other fold and an electrically insulating layer disposed between lengths of the transmission lines on either side of the fold.

First claim

What is claimed is:

1 . An RFID antenna having:
two flexible elongated conductive transmission lines with coplanar RFID energy radiation perturbations distributed along the transmission lines, the two flexible elongated conductive transmission lines both being folded at a fold around a distal end of a non-conductive plastic foam layer to form two first legs to one side of the fold and two second legs to an opposite side of the fold, wherein the two first legs are positioned adjacent a first surface of the non-conductive plastic foam layer and the two second legs are positioned adjacent an opposite second surface of the non-conductive plastic foam layer and wherein the coplanar RFID energy radiation perturbations of the two first legs do not overlie the coplanar RFID energy radiation perturbation of the two second legs.

2 . The antenna as set forth in claim 1 , wherein said transmission lines are in a serpentine pattern.

3 . The antenna as set forth in claim 1 , wherein said perturbations are stubs extending from said transmission lines.

4 . An RFID antenna comprising:
a pair of elongated parallel spaced-apart feed lines and radiation producing perturbations spaced-apart along the feed lines, said feed lines and said perturbations lying in a common plane, the feed lines comprising flat metal conductors, the feed lines being flexible and supported on a flexible layer, whereby said feed lines are capable of being bent to define a fold without damage to said flexible layer out of a single plane wherein an inner radius of the fold is not less than ¼ inch and wherein the perturbations on a portion of the feed lines to a first side of the fold do not overlie the perturbations on a portion of the feed lines to a second, opposite side of the fold.

5 . The RFID antenna as set forth in claim 4 , wherein said feed lines are in a serpentine pattern.

6 . The RFID antenna as set forth in claim 4 , wherein said perturbations are stubs extending laterally away from the feed lines.

7 . The RFID antenna as set forth in claim 6 , wherein the stubs are joined to a respective one of said feed lines.

8 . The RFID antenna as set forth in claim 4 , wherein said flexible layer is a plastic film.

9 . The RFID antenna as set forth in claim 4 , wherein said metal conductors are aluminum of 0.1 mm thickness.

10 . An RFID antenna having: elongated parallel transmission lines and radiation emitting perturbations distributed along the transmission lines, said transmission lines and said radiation emitting perturbations being coplanar and in a resiliently flexible state devoid of rigid support structures enabling the transmission lines to be bent to define a fold with a radius as small as ¼ inch out of a plane without damage to conform to a rigid structure and wherein the radiation emitting perturbations on a portion of the transmission lines to a first side of the fold do not overlie the radiation emitting perturbations on a portion of the transmission lines to a second, opposite side of the fold.

11 . The RFID antenna of claim 10 being capable of being folded so that said transmission lines are folded on themselves into a sandwich-like structure having a layer-to-layer dimension between lengths of the transmission line as small as ½ inch without damage.

Assignees

• Djb Group Llc
• Wistron Neweb Corp
• Wnc Corp

Inventors

• Burnside Walter D
• Burnside Jeffrey J
• Burkholder Robert J

Classifications

• H01Q1/2208

  associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems (methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00) · CPC title

• H01Q9/26 Primary

  with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength (resonant loop antennas H01Q7/00) · CPC title

• H01Q1/2216 Primary

  used in interrogator/reader equipment · CPC title

• H01Q1/085

  Flexible aerials; Whip aerials with a resilient base · CPC title

• G06K19/0723

  the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs · CPC title