Capacitance-based humidity and gas sensing RFID tags
US12352717B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2022 |
| Grant date | Jul 8, 2025 |
| Priority date | — |
| Expiry date | Dec 17, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2027/222
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An RFID tag system includes an antenna, an integrated circuit electrically connected to the antenna, and a humidity or gas indicator being electrically connected to the antenna and the integrated circuit. The humidity or gas indicator includes a first electrode, a second electrode, a dielectric material, and a gap between the first electrode and the second electrode. At least a portion of the gap contains the dielectric material. The dielectric material is configured to have a change in its dielectric constant responsive to exposure to an environmental stimulus, which may be at least one of humidity or the presence of a gas. The change in the dielectric constant of the dielectric material changes a capacitance of the humidity or gas indicator, causing the integrated circuit to indicate the presence of the environmental stimulus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.