Antenna for a moist environment

Patent metadata

Field	Value
Publication number	US-9379442-B2
Application number	US-201113704576-A
Country	US
Kind code	B2
Filing date	Jun 14, 2011
Priority date	Jun 15, 2010
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

The invention relates to an inductive antenna, comprising: a first planar conductive winding ( 42 ) on a first surface of a substrate, said first winding being cut off at regular intervals so as to form a series of pairs of first conductors ( 522, 524; 542, 546; 562, 564 ); and a second planar conductive winding ( 44 ) on a second surface of the substrate, said second winding being provided opposite the first winding and cut off in a direction vertically perpendicular to that of the cutoffs of the first winding so as to form a series of pairs of second conductors ( 526, 528; 546, 548; 66, 568 ). Each pair of first conductors defines a resonant subassembly with the pair of second conductors opposite thereto, wherein each of the two first conductors of a single subassembly are electrically connected to another first conductor of another subassembly or to a terminal ( 41, 43 ) of the antenna, the second conductors of adjacent pairs are not electrically connected to each other, and one end ( 5224, 244, 5424, 5444, 5624, 5644 ) of each first conductor is either electrically connected ( 523, 543, 563, 525, 545, 565 ) to one end ( 5284, 5264, 5484, 5464, 5684, 5664 ) of a second conductor of the subassembly in question or is not connected thereto, in which case the second conductors of the subassembly in question are electrically connected to one another.

First claim

The invention claimed is:

1. An inductive antenna comprising:
an insulating substrate;
a first planar conductive winding on a first surface of the substrate, interrupted at regular intervals to form a series of pairs of first conductive tracks;
a second planar conductive winding on a second surface of the substrate facing the first winding, the interruptions in the second winding facing the interruptions in the first winding to form a series of pairs of second conductive tracks;
each pair of first tracks defining, with the facing pair of second tracks, a resonant subassembly;
two first tracks of a same one of the subassemblies not being interconnected and each being electrically connected to one and only one other first track of only another one of the subassemblies or to a terminal of the antenna;
the second tracks of neighboring pairs of two neighboring sub-assemblies not being electrically interconnected; and
one end of each first track being:
electrically connected to one end of a second track of a given one of the subassemblies; or
not connected to any conductive element, wherein the second tracks of the given one of the subassemblies being electrically interconnected.

2. The antenna of claim 1 , wherein the substrate is flexible.

3. The antenna of claim 1 , having a thickness smaller than 1 millimeter.

4. The antenna of claim 1 , comprising more than two of the subassemblies.

5. The antenna of claim 1 , further comprising a half-subassembly formed of a first track opposite to a second track and coupled to at least one of the subassemblies.

6. A resonator comprising the antenna of claim 1 having interconnected terminals.

7. An electronic tag adapted to moist environments, comprising an electronic circuit connected to an antenna, wherein the antenna is that of claim 1 .

8. The electronic tag of claim 7 , wherein a matching circuit comprising at least one inductive element and one capacitive element is interposed between the antenna and the electronic circuit.

9. A duct comprising at least one electronic tag of claim 7 .

10. A package comprising at least one electronic tag of claim 7 .

11. An electromagnetic transponder comprising the tag of claim 7 and a sensor connected to the electronic circuit.

12. A use of the tag of claim 7 , in the ground.

13. A duct comprising at least one resonator of claim 6 .

14. A package comprising at least one resonator of claim 6 .

15. An electromagnetic transponder comprising at least one resonator of claim 5 and a sensor connected to the electronic circuit.

16. Use of the resonator of claim 6 in the ground.

Assignees

• Thomas Thierry
• Commissariat Energie Atomique

Inventors

• Thomas Thierry

Classifications

• H01Q7/00 Primary

  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 title

• H01Q1/04

  Adaptation for subterranean or subaqueous use · CPC title

• G06K19/07766

  comprising at least a second communication arrangement in addition to a first non-contact communication arrangement · CPC title

• H01Q1/2225

  used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal · CPC title