# US 2013/0278387 A1 · Radio Frequency Identification Sensor Assembly

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- Number: US 2013/0278387 A1
- Document ID: US20130278387A1
- Status: Published application
- Kind: A1
- Application number: 13/803,397
- Filed: 2013-03-14
- Published: 2013-10-24
- Earliest claimed: 2012-04-23
- Assignees: Avery Dennison Corporation
- Applicants: Avery Dennison Corporation
- Inventors: Ian J. FORSTER
- Web page: https://patentgrep.com/patent/US20130278387A1

## CPC

- G06K 7/10366: {the interrogation device being adapted for miscellaneous applications}
- G06K 19/0717: {the sensor being capable of sensing environmental conditions such as temperature history or pressure}
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS

## Abstract

In accordance with one embodiment, an RFID sensor assembly comprises a sensing RFID chip and a reference RFID chip. The sensing RFID chip and the reference RFID chip are configured for electrical coupling to an electronic component via a coupling arrangement. The coupling arrangement of the sensing RFID chip is configured to vary a coupling property in response to a sensed parameter.

## Claims

### Claim 1

An RFID system comprising:
an RFID sensor assembly with at least one pair of RFID chips in which at least one chip of the pair is a sensing RFID chip and at least one pair of the chip is a reference chip; and
an RFID interrogator wherein the interrogator includes an RFID reader and a first antenna;
wherein the at least one pair of RFID chips is coupled to a second antenna and the sensor assembly detects any combination of sensed parameters.

### Claim 2 (depends on 1)

The system of claim 1, wherein the sensed parameters are a specific or general class of airborne chemicals.

### Claim 3 (depends on 1)

The system of claim 1, wherein the at least one pair of RFID chips are electrically coupled to the second antenna by respective coupling capacitors.

### Claim 4 (depends on 1)

The system of claim 1, wherein the at least one pair of chips are encoded with a unique identifier.

### Claim 5 (depends on 1)

The system of claim 1, wherein the interrogator communicates with the sensor assembly using an inventory scan.

### Claim 6 (depends on 1)

The system of claim 1, wherein each RFID chip has a characteristic receive impedance Zr and characteristic backscatter impedance Zb.

### Claim 7 (depends on 1)

The system of claim 1, wherein the reader is configured to vary a power and frequency of a signal transmitted to the at least one pair of RFID chips.

### Claim 8

A method of utilizing a RFID sensor assembly comprising:
providing a RFID sensor assembly having at least one pair of RFID chips, and a RFID interrogator wherein the interrogator includes a RFID reader and a first antenna with the at least one pair of RFID chips coupled to a second antenna;
transmitting signals to the RFID sensor assembly via the first antenna;
receiving the signals by the second antenna;
directing those signals to at least one the pair of RFID chips; and
determining a sensed parameter.

### Claim 9 (depends on 8)

The method of claim 8, wherein at least one RFID chip is configured to vary a coupling property in response to a sensed parameter.

### Claim 10

A method of utilizing a RFID sensor assembly comprising:
providing a RFID sensor assembly having at least one pair of RFID chips, a RFID interrogator which includes a RFID reader and a first antenna and the at least one pair of RFID chips is coupled to a second antenna;
receiving signals from the from the at least one pair of RFID chips;
sending signals to the first antenna of the RFID interrogator; and
determining a sensed parameter.

### Claim 11 (depends on 10)

The method of claim 10, wherein the signals from the at least one pair of RFID chips are encoded with a unique identifier.

### Claim 12 (depends on 10)

The method of claim 10, wherein the method further comprising interrogating the RFID reader and identifying each RFID chip according to their unique identifier.

### Claim 13 (depends on 10)

The method of claim 10, wherein the at least one pair of RFID chips is coupled to a dipole antenna.

### Claim 14 (depends on 13)

The method of claim 13, wherein the at least one pair are in electrical communication with first and second links.

### Claim 15 (depends on 14)

The method of claim 14, wherein the first and second links are configured such that a conductivity of the links remains constant in response to a sensed parameter.

### Claim 16 (depends on 14)

The method of claim 14, wherein the first and second links are forms of a material compound having substantially constant conductivity.

### Claim 17 (depends on 10)

The method of claim 10, wherein the at least one pair of RFID chips includes at least one sensing RFID chip.

### Claim 18 (depends on 10)

The method of claim 10, wherein the at least one pair of RFID chips includes at least one reference RFID chip.