ANTENNA ARRANGEMENT AND TRANSPONDER READER

• US 20110193418A1
• Filed: 02/09/2011
• Published: 08/11/2011
• Est. Priority Date: 02/10/2010
• Status: Active Grant

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: VOM BOEGEL, Gerd, HENNIG, Andreas
• Granted Patent: US 8,847,434 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/076 Permanent implantations telemetry using implanted circuitry A61B5/0031; implanted stimulators for therapy A61N1/3605, A61N1/362, A61N1/372
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 1/525 between emitting and receiving antennas
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00

Abstract

An antenna arrangement has an inductive transmitting antenna having a main radiating axis, an inductive receiving antenna having a main receiving axis, and an inductive compensator. The inductive receiving antenna is arranged in the main radiating axis of the transmitting antenna. The inductive compensator is electrically connected in series to the receiving antenna and is arranged in a first plane which intersects a second plane. The main receiving axis of the receiving antenna here is normal to the second plane.

Claims

1. An antenna arrangement comprising:

an inductive transmitting antenna comprising a main radiating axis;

an inductive receiving antenna comprising a main receiving axis located in the main radiating axis of the transmitting antenna; and

an inductive compensator which is electrically connected in series to the receiving antenna and located in a first plane which intersects a second plane, the main receiving axis of the receiving antenna being normal to the second plane.

2. The antenna arrangement in accordance with claim 1, wherein the first plane is orthogonal to the second plane.

3. The antenna arrangement in accordance with claim 1, wherein the transmitting antenna is located in the second plane and the receiving antenna is located in the second plane or in a third plane which is parallel to the second plane.

4. The antenna arrangement in accordance with claim 1, wherein the receiving antenna and the transmitting antenna overlap at least partly.

5. The antenna arrangement in accordance with claim 1, wherein the transmitting antenna encloses the receiving antenna.

6. The antenna arrangement in accordance with claim 1, wherein the compensator extends, at least in an area of a conductor of the transmitting antenna, along the conductor.

7. The antenna arrangement in accordance with claim 6, wherein the compensator comprises a plurality of coils connected in series, each comprising at least one first winding, wherein the windings of the plurality of windings are located in the first plane, and wherein the plurality of coils extend along the conductor of the transmitting antenna.

8. The antenna arrangement in accordance with claim 7, wherein the compensator comprises a first sub-circuit and a second sub-circuit, the first sub-circuit being connected in series upstream of the receiving antenna and the second sub-circuit being connected in series downstream of the receiving antenna, and wherein each of the coils of the plurality of coils is associated to either the first sub-circuit or the second sub-circuit.

9. The antenna arrangement in accordance with claim 8, wherein coils of the plurality of coils which are associated to the first sub-circuit are arranged along a first half of the conductor and coils of the plurality of coils which are associated to the second sub-circuit are arranged along a second half of the conductor of the transmitting antenna.

10. The antenna arrangement in accordance with claim 9, wherein an arrangement of the coils along the first half of the conductor of the transmitting antenna is symmetrical to an arrangement of the coils along the second half of the conductor of the transmitting antenna.

11. The antenna arrangement in accordance with claim 6, wherein at least one of the coils of the plurality of coils comprises at least one second winding which is wound in the opposite direction to its respective first winding such that a voltage generated by a parasitic electrical field of the transmitting coil in the first winding is opposite to a voltage generated by the parasitic electrical field of the transmitting coil in the second winding.

12. The antenna arrangement in accordance with claim 6, wherein the conductor of the transmitting coil is a first conductive trace which forms a conductor loop, and wherein the plurality of coils are surface-mountable devices arranged on the conductor loop.

13. The antenna arrangement in accordance with claim 1, wherein the transmitting antenna, the receiving antenna and the compensator are arranged on a common substrate.

14. The antenna arrangement in accordance with claim 13, wherein the compensator is arranged on a surface of the substrate.

15. The antenna arrangement in accordance with claim 13, wherein the common substrate is a printable circuit board.

16. A transponder reader comprising an antenna arrangement comprising:

an inductive transmitting antenna comprising a main radiating axis;

an inductive receiving antenna comprising a main receiving axis located in the main radiating axis of the transmitting antenna; and

an inductive compensator which is electrically connected in series to the receiving antenna and located in a first plane which intersects a second plane, the main receiving axis of the receiving antenna being normal to the second plane.