Intermodulation distortion reduction methodology for high temperature superconductor microwave filters
US7761125B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2005 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Mar 20, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/866
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Intermodulation distortion (IMD) is known to be an impediment to progress in superconductor-based filter technology. The present invention's methodology for reducing IMD can open doors to heretofore unseen practical applications involving high temperature superconductor (HTS) filters. Typical inventive practice includes (a) increasing the thickness d, and/or (b) changing the operation temperature T, of the filter's HTS film. The film's thickness d is increased in such a way as to decrease the IMD power PIMD in accordance with the material-independent proportionate relationshipPIMD∝1/d1.5-6.The film's operation temperature T is bettered or optimized in accordance with the material-independent proportionate relationshipPIMD∝(λO(T))10(K(2)(T))2/(ΔO(T))6,and further in accordance with three individual material-dependent relationships, namely, between operation temperature T and each of linear penetration depth λO, gap maximum ΔO, and kernel K(2). Some inventive embodiments include oxygen overdoping of the film as an additional/alternative IMD-reductive measure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.