Antenna
US6300917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Aug 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A dielectrically-loaded antenna for operation at frequencies in excess of 200 MHz includes an antenna element structure disposed on a high dielectric constant core, which element structure comprises a pair of laterally opposed groups, of helical antenna elements. Each group comprises first and second mutually adjacent elements, of different thicknesses providing looped conductive paths on the antenna, formed by the first elements of each group and the second elements of each group respectively, which resonate at differing respective resonant frequencies to yield a relatively wide operating bandwidth. The helical elements of each group define, between them, part of an elongate channel which has an overall electrical length in the region of n.lambda./2 within the operating frequency band to provide isolation between the looped conductive paths. The major part of each such channel is located between the elements so as to minimise intrusion with other parts of the antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.