Dipole ring array antenna for circularly polarized pattern
US4555708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1984 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Jan 10, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S343/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A NAVSTAR satellite has a navigation antenna array beamed toward the earth. A communications antenna array for communicating with other satellites requires a pattern null near the axis and high gain to the sides with minimum losses. This is achieved with a dipole ring array comprising eight elements surrounding the navigation array. The ring has a diameter of 1.1 wavelength, and is fed with equal amplitudes and a third mode phase progression, which produces good circular polarization in the far field. For a different sized dipole ring, there will still be an optimum phase distribution which will give good circularly polarized patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.