Multi-band uniform helical antenna and communication device having the same
US6608605B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2001 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Dec 14, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q5/357
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A helical antenna tuned to a first and a second resonant frequency is disclosed. The helical antenna includes an elongated conductor formed as a uniform spiral. The uniform spiral has a plurality of turns about a longitudinal axis. The plurality of turns has a predetermined pitch and the elongated conductor has a length which is approximately one-quarter of a wavelength of the first resonant frequency. The helical antenna further includes a first dielectric element and a second element. Both elements are coupled to the spiral to selectively tune the antenna to the second resonant frequency. A wireless communication device including the helical antenna is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.