Ferroelectric varactor with built-in DC blocks
US6727535B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1999 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Nov 4, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D1/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A voltage tunable dielectric varactor includes a tunable ferroelectric layer and first and second non-tunable dielectric layers. First and second electrodes positioned adjacent to the tunable ferroelectric layer form a tunable capacitor. A third electrode is positioned adjacent to the first non-tunable dielectric layer such that the third and first electrodes and the first non-tunable dielectric layer form a first blocking capacitor. A fourth electrode is positioned adjacent to the second non-tunable dielectric layer such that the fourth and second electrodes and the second non-tunable dielectric layer form a second blocking capacitor. The first and second electrodes can be positioned on a surface of the tunable ferroelectric layer opposite the generally planar surface of the substrate, with the first and second electrodes being separated to form a gap. The first and second non-tunable dielectric layers can also be positioned on the generally planar surface of the substrate. The third electrode can be positioned on the surface of the first non-tunable dielectric layer opposite the generally planar surface of the substrate such that the third and first electrodes form a second gap. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.