Antenna device and communication terminal apparatus
US10997484B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2017 |
| Grant date | May 4, 2021 |
| Priority date | — |
| Expiry date | Nov 26, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An antenna device includes a power feed coil and a ring-shaped conductor arranged about an axis and a ring-shaped conductor including first and second edge end portions in an axial direction and a cavity inward from the first edge end portion. At least a portion of the cavity overlaps with a coil opening of the power feed coil when seen from the radial direction. The power feed coil causes electric field coupling, magnetic field coupling, and/or electromagnetic field coupling with the cavity. The ring-shaped conductor defines and functions as a booster antenna of the power feed coil. A substantial coil opening defining and functioning as an antenna is larger than that when only the power feed coil is provided, thus facilitating coupling with a communication partner-side antenna coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.