Use this browser-based tool for an initial engineering estimate. Inputs remain in this page and are not sent to a server.
Method and units
Quarter-wave length is c/(4f√εeff). The planning length divides that result by your selected reduction factor.
Model limits
The result is not a guaranteed allowable stub length. Via geometry, return paths and channel loss require simulation or measurement. The frequency of interest should reflect the signal spectrum and requirements.
Use the result in your project
Record the assumptions with the result. Check actual material and component data, evaluate tolerances and confirm the proposed construction before releasing manufacturing files.