# Questions tagged [vna]

VNA (Vector Network Analyzer) - Device to measure characteristics of electrical networks

6 questions
26 views

### S Parameters 75 ohm Coax in 50 Ohm System

What are the 50 ohm scattering parameters for a piece of 75 ohm coax? (I just need two of them of course). For simplicity assume that the length of 75 ohm coax is 2 electrical wavelengths at the ...
49 views

### Measuring PSR of a current reference chip

Some Background: I'm designing a test board to characterize noise and PSR of a multiple voltages(1V) and currents(1uA) reference IC. The chip has a single voltage source. I use ultra low noise MUX ...
100 views

### S parameters measurement inside VNA

How does Vector Network Analyzer (VNA) measures S parameters in reality? Namely we have equations: $b_1=S_{11}a_1+S_{12}a_2$ $b_2=S_{12}a_1+S_{22}a_2$ In theory, if i wanted to calculate ...
22 views

### Permittivity measurement using open-ended coaxial probe

I am trying to understand how the complex permittivity of liquids can be measured using an open-ended coaxial probe. For this kind of measurement, we put a open-ended coaxial line into the liquid ...