Transmitter, receiver, antenna arrangement for use with a transmitter or for use with a receive, and RFID transponder

• US 8,746,574 B2
• Filed: 01/30/2007
• Issued: 06/10/2014
• Est. Priority Date: 02/24/2006
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Salfelner, Anton
• Primary Examiner(s): Savusdiphol, Paultep
• Application Number:
  US12/280,184
• Publication Number:
  US 20090242633A1
• Time in Patent Office: 2,688 Days
• Field of Search: 235/487, 235/492, 235/439, 235/451
• US Class Current: 235/492
• CPC Class Codes: G01S 13/75 using transponders powered from received waves, e.g. using passive transponders , or using passive reflectors
• 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 19/07756 the connection being non-galvanic, e.g. capacitive
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• 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 1/2225 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 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

An antenna arrangement comprises an electric antenna (4) configured to receive a reception signal from a sender and at least one conductive loop (3, 25) with two terminals (16, 17) to be connected to a receiver circuit (2, 24) which is configured to process an electric signal generated by the at least one conductive loop (3, 25). The at least one conductive loop (3, 25) is spaced within a distance from and magnetically coupled to the electric antenna (4) such that the at least one conductive loop (4, 25) generates the electric signal in response to the reception signal received by the electric antenna (4). Alternatively, the antenna arrangement may be used as a sending antenna used with a transmitter.

Claims

1. An antenna arrangement for use with a receiver, comprising:

an electric antenna having an impedance of more than 120 π

Ω

in its near field and configured to receive a reception signal from a sender; and

at least one conductive loop with two terminals to be connected to a receiver circuit which is configured to process an electric signal generated by said at least one conductive loop;

said at least one conductive loop being spaced within a distance from and only magnetically coupled to said electric antenna such that said at least one conductive loop generates said electric signal in response to said reception signal received by said electric antenna;

wherein said at least one conductive loop and said electric antenna are symmetrically shaped such that said at least one conductive loop and said electric antenna each have a location of essentially the same electric potential;

said locations being interconnected.

2. The antenna arrangement of claim 1, wherein said at least one conductive loop has an inductance, resulting in an LC-resonance circuit with an input capacitance of said receiver circuit, and said at least one conductive loop is designed such that said LC-resonance circuit is tuned to a carrier frequency of said reception signal.

3. The antenna arrangement of claim 1, wherein at least a first part of said electric antenna and at least a second part of said at least one conductive loop are parallel to each other.

4. A receiver, comprising:

an integrated circuit with at least one conductive loop integrated into said integrated circuit;

said integrated circuit being configured to process an electric signal generated by said at least one conductive loop; and

an electric antenna having an impedance of more than 120 π

Ω

in its near field and configured to receive a reception signal from a sender;

said electric antenna being spaced within a distance of said integrated circuit and only magnetically coupled to said at least one conductive loop such that said at least one conductive loop generates said electric signal in response to said reception signal received by said electric antenna.

5. An antenna arrangement for use with a transmitter, comprising:

an electric antenna having an impedance of more than 120 π

Ω

in its near field and configured to send a transmission signal to a receiver; and

at least one conductive loop with two terminals to be connected to a driving circuit of a transmitter;

said driving circuit injecting an electric signal into said at least one conductive loop, which is spaced within a distance from and only magnetically coupled to said electric antenna such that said electric antenna generates said transmission signal in response to said electric signal injected into said at least one conductive loop;

wherein at least a first part of said electric antenna and at least a second part of said at least one conductive loop are parallel to each other; and

wherein said at least one conductive loop and said electric antenna are essentially symmetrically shaped such that said at least one conductive loop and said electric antenna each have a location of essentially the same electric potential;

said locations being interconnected.

6. The antenna arrangement of claim 5, wherein said at least one conductive loop has an inductance resulting in an LC-resonance circuit with an output capacitance of said driving circuit, and said at least one conductive loop is designed such that said LC-resonance circuit is tuned to a carrier frequency of said transmission signal.

7. A transmitter, comprising:

an integrated circuit with at least one conductive loop integrated into said integrated circuit;

said integrated circuit being configured to inject an electric signal generated by said at least one conductive loop; and

an electric antenna having an impedance of more than 120 π

Ω

in its near field and configured to send a transmission signal to a receiver;

said electric antenna being spaced within a distance of said integrated circuit and only magnetically coupled to said at least one conductive loop such that said electric antenna generates said transmission signal in response to said electric signal injected into said at least one conductive loop.

8. An RFID transponder, comprising:

an electric circuit; and

an antenna arrangement comprising an electric antenna having an impedance of more than 120 π

Ω

in its near field and configured to receive a reception signal from an external sender and/or to send a transmission signal to an external receiver, and at least one conductive loop with two terminals connected to said electric circuit;

said at least one conductive loop being spaced apart within a distance from and being only magnetically coupled to said electric antenna such that said electric antenna generates said transmission signal in response to a first electric signal injected into said at least one conductive loop by said electric circuit and/or such that said at least one conductive loop generates a second electric signal in response to said reception signal received by said electric antenna;

wherein said electric circuit is an integrated circuit comprising said at least one conductive loop as an integrated part.

9. The RFID transponder of claim 8, comprising a substrate on which said electric circuit and said at least one conductive loop are arranged.

10. The RFID transponder of claim 9, wherein said electric antenna is arranged on said substrate.