Multi-layer radio frequency transformer
US5451914A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Jul 5, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2017/0073
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A transformer (300) includes several layers of substrate (202, 204, 206, 208). Sandwiched between first set of layers (204 and 206) is a runner that forms two interconnected spirals (323 and 324). These spirals run in opposite directions and form two half coils of the transformer primary. Similarly, sandwiched between the second set of layers (204 and 206) is a runner that forms two other interconnected spirals (321 and 322). These spirals run in opposite directions and form two half coils of the transformer secondary. These half coils are magnetically coupled through the substrate (206) which is substantially thinner than the other substrates (204 and 208). Ground layers (210 and 216) discourage horizontal coupling of the electromagnetic flux between the half coils (321, 322, 323, 324), hence improving the vertical flux transfer through the thin layer (206). Components (218) added to the top layer (202) provide for a device, such as an amplifier inclusive of its coupling transformer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.