Printed circuit transformer
US5003622A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Sep 26, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Circuits such as balanced diode mixers require balanced transformers. For ultrahigh frequency operation, a balanced transformer is formed as part of a printed circuit on a planar substrate of insulating material. The balanced transformer has a center-tapped winding formed by a loop of a strip transmission line having first and second coextensive elongated conductors disposed on the substrate. Preferably the first and second conductors are disposed adjacent each other on respective opposite sides of the substrate. At a first end portion of the strip transmission line, the second conductor is connected to a center tap, and at a second end portion of the strip transmission line, the first conductor is also connected to the center tap. For a balun transformer, the center tap is a ground plane provided by conductive regions disposed on the substrate. Preferably an unbalanced signal is fed into the transformer at a second winding including at least a third elongated conductor disposed on the substrate coextensive with the first and second conductors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.