Multi-band antenna structure for a portable radio
US5945964A · kind A · utility
13Cited by
22References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A first coil (110) resonant at a first frequency, and a second coil (120) resonant at a second frequency, coupled to a conductive straight portion (140) of an antenna element (130) to form a multi-band antenna structure. The first and second coils (110) and (120) are preferably of different axial lengths and circumferences, wound in opposite directions and coaxially disposed about the antenna element (130). Additional coils can be added to accommodate additional bands and an upper coils (150) can be used to realize a multi-position structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.