Method for adjusting phase in contactless communication
US11126805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2019 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | Apr 21, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/26
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An object is capable of contactless communication with a reader by active charge modulation. The object includes an antenna, an impedance matching circuit, a memory, and a controller connected to the antenna through the impedance matching circuit. The antenna, the an impedance matching circuit and the controller together form a resonant circuit having a resonant frequency. The controller is configured to cause the object to transmit, in the absence of a signal received from a reader, a signal at the resonant frequency, to determine a characteristic obtained from the signal uniquely transmitted by the object, and to perform an adjustment of a phase shift within the object based on the characteristic and an indication stored in the memory, the indication linking values of phase shifts with values of the characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.