Retractable antenna with shifting electrical length
US5999133A · kind A · utility
5Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Mar 23, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/244
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna for small mobile devices comprises an antenna rod retractable in an antenna cover, the rod having an extended position, when the device operates in an active mode, or a retracted position, when the device operates in a passive mode. The electrical length of the antenna is different in the respective modes. Further, the antenna rod comprises an upper section and a lower section, separated from each other by an intermediate electrically insulating portion, wherein the upper section forms an antenna in a passive mode and the two sections in the active mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.