Phase correcting zone plate
US5486950A · kind A · utility
18Cited by
5References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1993 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Mar 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q19/065
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A zone plate focusing radiation comprises a plurality of surface portions (20a, 20b, 20c, 20d, 30) corresponding to zones of the zone plate. The surface portions are positioned in a plurality P of parallel planes such that each surface portion diffracts radiation out of phase with respect to adjacent surface portions such that radiation diffracted by the surface portion constructively interferes at a focus of the zone plate. The p.sup.th plane is dielectrically spaced from the first plane by n.lambda., where .lambda. is the wavelength of the radiation and n is an integer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.