What is that?
Mismatch spikes are typical spurious responses, which often occur in filter assemblies. This kind of spurious is usually caused by standing wave in transmission lines connecting reflective devices (usually rejective filters). The amplitude of the spikes over the frequency scale depends of reflection properties of the devices and electrical length between them. This simple tool helps to evaluate the "best" and "worse" cases of the spurious.
Example
Filter #1: Transmission & Reflection (dB) versus Frequency (GHz) Characteristics
Filter #2: Transmission & Reflection (dB) versus Frequency (GHz) Characteristics
Filter #1 connected to Filter #2: Transmission & Reflection (dB) versus Frequency (GHz) Characteristics
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