# US 2013/0153669 A1 · Spring oriented rfid board

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- Number: US 2013/0153669 A1
- Document ID: US20130153669A1
- Status: Published application
- Kind: A1
- Application number: 13/819,976
- Filed: 2010-08-30
- Published: 2013-06-20
- Earliest claimed: 2010-08-30
- Assignees: Michelin Recherche et Technique S.A.; Compagnie Generale Des Etablissements Michelin
- Inventors: Jay Clifford Sinnett
- Web page: https://patentgrep.com/patent/US20130153669A1

## CPC

- G06K 19/07764: {the adhering arrangement making the record carrier attachable to a tyre (tyre temperature or pressure control arrangements, see B60C23/00)}
- B60C 23/0452: {Antenna structure, control or arrangement (vehicle tyre mounted antennas H01Q1/2241)}
- B60C 23/0493: {for attachment on the tyre}
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

Disclosed is an apparatus for providing an RFID device for integration into a tire. A printed circuit board (PCB) is provided with a pair of asymmetric arms forming notches in opposed ends of the PCB. Helically wound antenna elements are positioned in the notches such that the ends of the asymmetric arms are positioned adjacent the nearest approach of the individual helically wound antenna elements.

## Claims

### Claim 1

An RFID device for integration into a tire, comprising:
a printed circuit board (PCB) having top and bottom surfaces delineated by opposed end portions and opposed side portions;
a plurality of conductive traces on the top surface of said PCB;
a pair of asymmetric arms extending from one end of said PCB forming a notch;
a plated through via piercing the PCB from the top surface to the bottom surface;
a conductive trace element surrounding said via at the top surface of said PCB, the trace element electrically coupled to the plurality of conductive traces; and,
a helically wound antenna element having an end portion positioned within said notch and within a plane defined by the top surface of the PCB,
wherein said helically wound antenna element is wound with a predetermined pitch, wherein said pair of asymmetric arms differ in length by one half the predetermined pitch, and wherein an end of each of the arms of said pair of asymmetric arms extends so that it ends adjacent to the nearest approach of said helically wound antenna element.

### Claim 2 (depends on 1)

The device of claim 1, further comprising a non-conductive elastomeric material surrounding said PCB and at least a portion of said antenna element, and filling said notch,
whereby synergism among the elastomeric material and the positioning of the antenna within the notch and the plane of the PCB provides a controlled stress gradient for the antenna connection to the PCB.

### Claim 3 (depends on 1)

The device of claim 1, wherein the antenna element comprises a helically wound conductor having an outer diameter between about 1.15 and 1.25 mm.

### Claim 4 (depends on 3)

The device of claim 3, wherein the antenna element comprises a helically wound conductor having an outer diameter of about 1.2 mm.

### Claim 5 (depends on 3)

The device of claim 3, wherein the helically wound conductor is wound with a single pitch between turns, the pitch ranging between about 0.735 mm to 0.803 mm per turn.

### Claim 6 (depends on 5)

The device of claim 5, wherein the helically wound conductor is wound with a single pitch between turns of about 0.769 mm per turn.

### Claim 7

The device of claim I, wherein the length of the asymmetric arms differs by about 0.3675 mm to 0.4015 mm.

### Claim 8 (depends on 1)

The device of claim 1, wherein the length of the asymmetric arms differs by about 0.3845 mm.

### Claim 9 (depends on 1)

The device of claim 1, further comprising a second notch formed by a second pair of asymmetric arms positioned at the opposing end of said PCB, a second plated through via pierces the PCB and a second antenna positioned within said second notch and in the plane defined by the top surface of the PCB.

### Claim 10 (depends on 1)

The device of claim 1, further comprising a non-conductive elastomeric material surrounding said PCB and at least a portion of said antenna element, and filling said notch, whereby synergism among the elastomeric material and the positioning of the antenna within the notch and the plane of the PCB provides a controlled stress gradient for the antenna connection to the PCB.

### Claim 11 (depends on 10)

The device of claim 10, further comprising a bonding agent for securing said non-conductive elastomeric material to the antenna element and PCB.