RF Mismatch Ripple and Spurious Spikes Calculator
Enter Transmission of 1st Device [dB]
Enter Transmission of 2nd Device [dB]
Enter Quality Factor of Connection
Minimum/Maximum Transmission [dB]
© R. Goulouev, 20.10.2007


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