Plain-language answer: Leakage inductance represents magnetic flux from one transformer winding that does not couple to the other winding.
Why it changes the path
It behaves like unwanted series inductance, affecting high-frequency response, matching, voltage stress, and transient behavior.
What to observe
Measure in the intended fixture and preserve winding overlap, spacing, phasing, core, and lead length.
The common mistake
Assuming perfect coupling because both windings share a core.
Planning boundary
Propagation models and field regions depend on frequency, geometry, terrain, atmosphere, polarization, antenna pattern, and measurement distance. Use them to plan and compare—not to guarantee a contact or installed range.
