Multilayer thin film dielectric bandpass filter
US6011652A · kind A · utility
18Cited by
3References
11Claims
0Family size
Inventor
Key dates
| Filing date | Dec 23, 1997 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/288
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a multi-layer dielectric bandpass filter having a primary and a secondary passband. A secondary passband outside the reflection zone of the primary passband is optimized to reduce ripple achieving a passband of at least 90% transmission. Optimization comprises modifying the thickness of certain quarter wavelength reflector layers of a single passband filter from true quarter wavelength at the primary passband to non-quarter, or non-integer-multiple quarter wave thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.