Tandem circular polarizer
US5576668A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Jan 26, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/173
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system (12) operative with at least one electromagnetic wave to produce a circularly polarized wave includes a plurality of polarizer sections (56) disposed along a direction of propagation of one electromagnetic wave. The polarizer sections have opposed rows of phase shifting elements, in the form of rods (76), which are adjusted to provide a match to the orthogonal components of the wave. Penetration and spacing of phase shifting elements within each of the polarizing sections attains a match to the two orthogonal components of the wave and a differential phase shift between the two orthogonal components slightly in excess of a desired 90 degree orthogonal phase relationship. Upon a differential counter rotation between a first and a second of the polarizer sections, the total phase shift introduced by the polarizer sections is reduced to 90 degrees without significant shift in the match of the two orthogonal components. The equality of the amplitudes of the two orthogonal components is attained by a rotation of the polarizer (42) with respect to the orthomode transducer (34). This provides for a precise generation of a circularly polarized wave. In a satellite communication sy…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.