Antenna system and a radio communication device including an antenna system
US6334048A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1999 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | May 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna system including an antenna device and feed device for transmitting and receiving circularly polarized RF waves in a first mode of operation, and of linearly polarized RF waves in a second mode of operation, and a hand-held mobile communication device provided with such an antenna system. A radiating structure (10) including N helical radiating elements (12A-D), being coextending and coaxially arranged on a support structure (11) are fed in order to provide for transmission/reception of circularly polarized RF waves in the first mode of operation. N is an integer greater than one. Further, means (24A-D, 16, 17, 19, 25, 25A) are arranged for essentially uniform excitation of the helical radiating elements (12A-D) in order to provide for transmission/reception of linearly polarized RF waves in the second mode of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.