# US 2014/0152519 A1 · Wire capacitor, in particular for a radio frequency circuit, and device comprising said wire capacitor

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- Number: US 2014/0152519 A1
- Document ID: US20140152519A1
- Status: Published application
- Kind: A1
- Application number: 14/117,921
- Filed: 2012-05-15
- Published: 2014-06-05
- Earliest claimed: 2011-05-17
- Assignees: Gemalto SA
- Inventors: Arek Buyuk-Kalender; Christophe Bousquet; Frédérick Seban; Nizar Lahoui
- Web page: https://patentgrep.com/patent/US20140152519A1

## CPC

- H01Q 9/06: Details
- 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}
- 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)}
- B42D 25/00: Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof (printing processes to produce identification or security features B41M3/14)
- 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
- H01Q 7/08: Ferrite rod or like elongated core
- H01Q 9/30: with feed to end of elongated active element, e.g. unipole (H01Q9/44 takes precedence)
- H01Q 21/26: Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS

## Abstract

The invention relates to a radio frequency device including an antenna connected to a capacitor. Said capacitor includes first and second conductive plates that are opposite each other and separated by an insulator. At least one of said first and second plates is formed of a plurality of wire capacitor portions. Said radio frequency device is different in that the antenna and at least one capacitor plate are formed with wire portions placed on a substrate in a guided manner.

## Claims

### Claim 1

A radio frequency device comprising an antenna linked to a capacitor, with said capacitor comprising a first and a second conductive plates facing each other and separated by an insulator, with at least one said first and second plates being formed by several portions of the wire conductor, characterized in that the antenna and at least a capacitor plate are formed with wire portions deposited in a guided manner onto a substrate.

### Claim 2 (depends on 1)

A device according to claim 1, wherein the portions are deposited in a guided manner onto a substrate.

### Claim 3 (depends on 1)

A device according to claim 1, wherein said wire portions form parallel layers or spirals.

### Claim 4 (depends on 1)

A device according to claim 1, wherein the wire portions of the two plates are deposited on the same side of the substrate.

### Claim 5 (depends on 1)

A device according to claim 1, wherein the wire portions of the first plate cross the wire portions of the second plate so as to be substantially bound to the substrate in substrate zones not covered by the wire portions of the first plate.

### Claim 6 (depends on 1)

A device according to claim 1, wherein the wire portions are deposited by embroidery or overlay on the substrate.

### Claim 7 (depends on 1)

A device according to claim 1, wherein it comprises an assembly of capacitors in series obtained by stacking at least three grids or plates, either by making at least two stacked on a path of the same turn or of a track.

### Claim 8 (depends on 1)

A device according to claim 1, wherein at least one of said first and second plate is formed astride the antenna by crossing antenna turns.

### Claim 9 (depends on 1)

A device according to claim 1, wherein the antenna and at least one capacitor plate are formed continuously using the same continuous wire.

### Claim 10 (depends on 1)

A radio frequency device according to claim 1, wherein it constitutes a passive antenna tuned in frequency.

### Claim 11 (depends on 9)

A radio frequency device according to claim 9, wherein it comprises an assembly of capacitors in series obtained either by stacking at least three plates, or by making at least two capacitors stacked on a path of the same turn or a track.