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Questions tagged [vna]

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

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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 ...
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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 ...
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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 ...
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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 ...
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S11 parameter measurements of NFC PCB antenna by VNA

I'm trying to measure the S11 parameter of the NFC PCB antenna (actually PCB coil) by VNA. Desired Smith chart pattern is like the below picture (probably with different values, because of different ...
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VNA reflection and transmission of stripline stub

Testing this stub board. I understand S12 is attenuated at 1.79GHz due L=λ/4. So I calculate relative permitivity: εr = (c / 4Lf)2 = 3.3 But what does (εr) represent in a ...