Contactless data storage medium

• US 6,946,958 B2
• Filed: 05/13/2003
• Issued: 09/20/2005
• Est. Priority Date: 11/13/2000
• Status: Expired due to Term

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Müller-Hipper, Andreas, Riedel, Jens, Hochholzer, Michael, Kargl, Walter, Holweg, Gerald, Gundlach, Harald
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US10/437,398
• Publication Number:
  US 20040074975A1
• Time in Patent Office: 861 Days
• Field of Search: 340/539.21, 340/825.69, 340/825.72, 340/572.1, 340/572.7, 340/5.61, 340/5.6, 340/5.64, 340/10.1, 340/10.51, 235/375, 235/380, 235/382, 343/713, 343/742, 343/728, 343/751, 343/842, 343/867, 343/873, 455/421, 455/115.1, 455/115.3, 455/115.4, 455/134, 345/053.921, 345/825.69, 345/825.72, 345/572.1
• US Class Current: 340/539.21
• CPC Class Codes: G06K 19/0724 the arrangement being a circuit for communicating at a plurality of frequencies, e.g. for managing time multiplexed communication over at least two antennas of different types
• 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: G06K 19/07767 the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies
• CPC Class Codes: G06K 19/07777 the antenna being of the inductive type
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: G06K 19/07788 the antenna being of the capacitive type
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• 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 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

A contactless data storage medium has at least two antennas, in each case for different transmission bands. This makes it possible to configure a data storage medium such that it can be operated with read/write units that operate in accordance with different standards. At least two of the antennas form a unit, so that a configuration such as this can be produced at very low cost.

Claims

1. A contactless data storage medium, comprising:

a data processing unit having a device for identifying a transmission band with a strongest received signal, and a received signal preprocessing unit being be set to the transmission band; and

at least two antennas for respectively different transmission bands, at least two of said antennas being directly connected to one another.

2. The contactless data storage medium according to claim 1, wherein a first of said antennas is a dipole antenna and a second of said antennas is a loop antenna.

3. The contactless data storage medium according to claim 1, further comprising an additional capacitive antenna.

4. The contactless data storage medium according to claim 1, wherein data is transmitted via one of said antennas, and power for supplying power to the contactless data storage medium is transmitted via another one of said antennas.

5. The contactless data storage medium according to claim 2, wherein said at least two antennas are individually produced components, and electrically conductively connected to one another.