Oriented PIFA-type device and method of use for reducing RF interference
US7230574B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Aug 13, 2004 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Feb 15, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0421
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An oriented PIFA-type apparatus for reducing hearing aid radio frequency (RF) interference including a directional multi-band and/or single band antenna for use with PWDs such as digital cellphones is disclosed. The apparatus greatly reduces or eliminates the audio noise induced in hearing aids by the PWDs and allows operation of a hearing aid during PWD operation. In operation, the apparatus may be provided on the PWD side away from the user's head. The apparatus may be integrated into the PWB during its manufacture or provided as an after market assembly for a PWD that has a port for connection of an external antenna. The apparatus provides for improved front-to-back ratio as compared to antennas currently in use on PWD's, and therefore also reduces SAR (specific absorption rate), the level of RF energy received into the head by a PWD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.