Multi-band PIFA
US7324054B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2005 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Dec 15, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0442
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The method and apparatus described herein improves the impedance matching of a multi-band antenna. In particular, the multi-band antenna comprises a radiating element vertically displaced from an antenna ground plane by feed and ground elements, and a parasitic element interposed between the feed and ground elements. When the multi-band antenna operates in the first frequency band, a selection circuit connects the parasitic element to the ground plane to capacitively couple the ground element to the feed element. However, when the multi-band antenna operates in the second frequency band, the selection circuit disables the capacitive coupling. By applying the capacitive coupling only when the multi-band antenna operates in the first frequency band, the present invention improves the performance of the antenna in the first frequency band without adversely affecting the performance of the antenna in the second frequency band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.