# US 12,112,222 B2 · Shielding and/or enhancement of temperature-sensing RFID devices

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- Number: US 12,112,222 B2
- Document ID: US12112222B2
- Status: Granted
- Kind: B2
- Application number: 18/366,862
- Filed: 2023-08-08
- Published: 2023-11-23
- Granted: 2024-10-08
- Earliest claimed: 2018-12-06
- Assignees: Avery Dennison Retail Information Services LLC
- Applicants: Avery Dennison Retail Information Services LLC
- Inventors: Ian J. Forster
- Web page: https://patentgrep.com/patent/US12112222B2

## CPC

- G06K 19/0717: {the sensor being capable of sensing environmental conditions such as temperature history or pressure}
- G06K 19/0773: {the record carrier comprising means to protect itself against external heat sources}
- G01K 1/024: for remote indication
- G01K 1/16: Special arrangements for conducting heat from the object to the sensitive element
- G01K 1/18: for reducing thermal inertia
- G06K 19/0723: {the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs}
- G06K 19/07775: {the antenna being on-chip}
- G06K 19/07794: {the record carrier comprising a booster or auxiliary antenna in addition to the antenna connected directly to the integrated circuit}
- H01Q 1/2225: {used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal}
- 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
- G01K 2207/04: for conservation purposes
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A temperature-sensing RFID device includes an RFID chip and an antenna electrically coupled thereto. The RFID chip includes a temperature sensor, while the antenna is adapted to receive energy from an RF field and produce a signal. A shielding structure and/or a thermally conductive or absorbent structure may be associated with the RFID chip. The shielding structure is oriented so as to be positioned between at least a portion of the RFID chip and an outside environment and configured to shield the temperature sensor from at least one environmental factor capable of affecting a temperature sensed by the temperature sensor of an article to which the RFID device is secured. The thermally conductive or absorbent structure is oriented so as to be positioned between at least a portion of the RFID chip and the article and configured to enhance thermal coupling between the temperature sensor and the article.

## Claims

### Claim 1

A temperature-sensing RFID device, comprising:
an RFID chip including a temperature sensor;
an antenna adapted to receive energy from an RF field and produce a signal and including
a first portion directly coupled to the RFID chip, the first portion of the antenna comprising a minor portion sized and configured to minimize heat transfer from the antenna to the RFID chip and
a second portion separated from the RFID chip and from the first portion of the antenna by a thermally isolating gap and configured to be coupled to the RFID chip by a magnetic field, an electric field, or both a magnetic field and an electric field, the second portion of the antenna comprising a major portion that is larger than the first portion of the antenna.

### Claim 2 (depends on 1)

The temperature-sensing RFID device of claim 1, wherein
the first portion of the antenna comprises a conductive ring or loop of conductor, and
the RFID chip and the first portion of the antenna combine to define a reactive strap.

### Claim 3 (depends on 1)

The temperature-sensing RFID device of claim 1, wherein the first portion of the antenna is sized and configured to provide a desired thermal connection between the RFID chip and an article to which the temperature-sensing RFID device is to be secured.

### Claim 4 (depends on 1)

The temperature-sensing RFID device of claim 1, further comprising
a ground plane formed of a conductive material, and
a non-conductive spacer, wherein
the ground plane is associated to a first surface of the non-conductive spacer,
the RFID chip and the first and second portions of the antenna are associated to an opposing second surface of the non-conductive spacer, and
the first portion of the antenna is thermally coupled to the ground plane.