Wideband, differential signal balun for rejecting common mode electromagnetic fields
US8624688B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 2013 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Feb 22, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P5/028
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Provided are assemblies and processes for efficiently coupling wideband differential signals between balanced and unbalanced circuits. The assemblies include a broadband balun having an unbalanced transmission line portion, a balanced transmission line portion, and a transition region disposed between the unbalanced and balanced transmission line portions. The unbalanced transmission line portion includes at least one ground and a pair of conductive signal traces, each isolated from ground. The balanced portion does not include an analog ground. The transition region effectively terminates the analog ground, while also smoothly transitioning or otherwise shaping transverse electric field distributions between the balanced and unbalanced portions. Beneficially, the balun is free from resonant features that would otherwise limit operating bandwidth, allowing it to operate over a wide bandwidth of 10:1 or greater. Assemblies can include RF chokes with back-to-back baluns, and other elements, such as balanced filters, and also can be implemented as integrated circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.