Film having an imprinted antenna

• US 7,289,066 B2
• Filed: 01/27/2006
• Issued: 10/30/2007
• Est. Priority Date: 01/28/2005
• Status: Expired due to Fees

• Current Assignee: Nordenia Deutschland Gronau GmbH (Mondi PLC)
• Original Assignee: Nordenia Deutschland Gronau GmbH (Mondi PLC)
• Inventors: Kohla, Michael, Homölle, Dieter
• Primary Examiner(s): Nguyen; Hoang V.
• Application Number:
  US11/342,063
• Publication Number:
  US 20060176236A1
• Time in Patent Office: 641 Days
• Field of Search: 343/795, 343/700.MS, 343/801, 343/702, 343/866
• US Class Current: 343/700.0MS
• CPC Class Codes: G06K 19/077 Constructional details, e.g. mounting of circuits in the carrier
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: H01Q 1/2208 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 Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A film having an imprinted antenna, for use with an RFID chip. The antenna consists of a conductor track provided with connector ends. According to the invention, the antenna, applied in a printing method, with a conductive printing ink, has window-like recesses in the conductor track, whereby the area of the recesses amounts to at least 20% of the total area having the recesses.

Claims

1. A film having an imprinted antenna, for use with an RFID chip, the antenna comprising a conductor track having connector ends, wherein the antenna has window-like recesses uniformly distributed over an entire length of the conductor track all the way to the connector ends, and wherein an area of the recesses amounts to at least 20% of a total area of the conductor track having the recesses.

2. A film according to claim 1, wherein the conductor track has a grid structure, in a top view, which consists of two longitudinal traces that run in a longitudinal direction of the conductor track, and a plurality of crosspieces that connect the longitudinal traces, wherein the grid structure extends over an entire length of the conductor track, all the way to the connector ends.

3. A film according to claim 1, wherein the antenna is designed for excitation in the UHF range between 800 and 1000 MHz or in the SHF range between 2.4 and 2.6 GHz.

4. A film according to claim 1, wherein the recesses in the conductor track are round, ellipsoid, or rectangular.

5. A film according to claim 1, wherein the conductor track of the antenna consists of two conductor track pieces disposed with axial symmetry, and wherein the conductor track forms a half-wave dipole antenna.

6. A film according to claim 5, wherein the conductor track pieces run straight, bent, or angled in a direction of the antenna ends.

7. A film according to claim 1, wherein the conductor track forms an antenna loop.

8. A film according to claim 1, wherein the film comprises polymer carrier films, multi-layer coextruded films, or laminates are used as the film material.

9. A film according to claim 1, wherein the antenna is imprinted onto the film using a gravure printing method.

10. A film having an imprinted antenna, for use with an RFID chip, the antenna comprising a conductor track having connector ends, wherein the antenna has window-like recesses in the conductor track and wherein an area of the recesses amounts to at least 20% of a total area of the conductor track having the recesses, and wherein the antenna has a bandwidth of at least 100 MHz, based on a reduction of reflux attenuation in a resonance range of up to −

10 dB.

11. A film having an imprinted antenna, for use with an RFID chip, the antenna comprising a conductor track having connector ends, wherein the antenna has window-like recesses in the conductor track and wherein an area of the recesses amounts to at least 20% of a total area of the conductor track having the recesses, wherein the conductor track of the antenna consists of two conductor track pieces disposed with axial symmetry, wherein the conductor track forms a half-wave dipole antenna and wherein the dimensions of the recesses in the conductor track pieces decrease in the direction of the antenna ends.

12. A film having an imprinted antenna, for use with an RFID chip, the antenna comprising a conductor track having connector ends,

wherein the antenna has window-like recesses in the conductor track and wherein an area of the recesses amounts to at least 20% of a total area of the conductor track having the recesses,

wherein the conductor track has a grid structure, in a top view, which consists of two longitudinal traces that run in a longitudinal direction of the conductor track, and a plurality of crosspieces that connect the longitudinal traces,

wherein the grid structure extends over an entire length of the conductor track, all the way to the connector ends, and

wherein a width of the crosspieces between the recesses increases in the direction of the antenna ends.