Reason for mismatch/frequency shift between measured and simulated results at high frequencies?

07 July 2019 1 1K Report

What is the reason for mismatch/frequency shift between measured and simulated results at high frequencies apart from insertion losses of the connectors, fabrication tolerances, reflections (mismatched load), higher order modes etc?

Suhas Dinesh

Is it because of the change in the real and imaginary part of permittivity at high frequencies?

Picture Source: https://en.wikipedia.org/wiki/Permittivity

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