Adjustment of electromagnetic fields produced by wireless communications devices
US8406831B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2010 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Jul 8, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus are provided for adjusting the electromagnetic fields produced by telephones or other mobile devices capable of wireless communication. A wireless communication device includes a substrate having a ground plane. An antenna is coupled to the ground plane, and electrical currents are produced in the ground plane during operation of the antenna. A switchable counterpoise circuit that includes a conducting element and an inductor in series is provided on the substrate. The switchable counterpoise is selectively coupled to the ground plane based upon an operating mode of the wireless communications device, thereby adjusting the electrical currents flowing in the ground plane when the counterpoise is active. The changes in the ground plane currents can produce adjustments in the electromagnetic fields produced by the device, thereby improving hearing aid compatibility (HAC) of the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.