Quarter wave plate polarizer with two phase-shifting portions
US6356164B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 12, 2000 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Jan 12, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A right circular cylindrical body of an isotropic dielectric such as a cross-linked styrene copolymer, has respective pluralities of mutually parallel grooves formed in its axial end faces, spaced apart by an intermediate portion whose dimension c is a half wavelength. The axial lengths a, b of the grooves are such that when a wave passes through the body, a quarter wavelength phase difference is produced between a component of a wave having its E-vector parallel to the grooves and a component of the wave having its E-vector orthogonal to the grooves. Alternatively the plate may consist of two or more discrete bodies whose grooves are dimensioned to produce a total differential phase shift of one quarter wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.