Quadrifilar antenna
US6384798B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1997 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Sep 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A quadrifilar antenna for use in satellite communications comprises four conductive elements arranged to define two separate helical pairs, one slightly differing in electrical length than the other, defined by a cylinder of constant radius supported by itself or by a cylindrical non-conductive substrate. The two separate helical pairs are connected to each other in such a way as to constitute the impedance matching, electrical phasing, coupling and power distribution for the antenna. In place of a conventional balun, the antenna is fed at a tap point on one of the conductive elements determined by an impedance matching network which connects the antenna to a transmission line. The matching network can be built with distributed or lumped electrical elements and can be incorporated into the design of the antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.