Antenna for portable radio devices
US5668559A · kind A · utility
39Cited by
12References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1994 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Oct 13, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/362
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention concerns an antenna for portable radio devices including a helical antenna coupled at the base to a transmitter/receiver. The pitch of a conductive material helix constituting the helical antenna varies according to the height of the helix. It decreases from the base of the helical antenna towards its top.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.