Direct fed bifilar helix antenna
US8547291B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 2011 |
| Grant date | Oct 1, 2013 |
| Priority date | — |
| Expiry date | Apr 29, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention as disclosed is a direct fed bifilar helix antenna. The bifilar helix is lengthened as needed to obtain the desired unidirectional pattern. The bifilar helix is employed as an infinite balun to bring a feed cable onto the antenna structure and eventually connect the feed cable to the antenna feed point. The bifilar elements are widened such that the combined width of each element is as wide as practically possible before the elements touch and/or overlap (approximately 98.5% of the available width) so that the practical lowest characteristic impedance value of approximately 50 ohms is obtained so that there is no need for a matching network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.