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Coaxial cable, or coax, is a type of cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.

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under test, and using a VNA, the reflection coefficient is determined and from this, the permittivity can be found. The load impedance at the end of the coax is $$Z = \frac{1}{j\,\omega\left( C_0 … \,\epsilon_r + C_f \right)} $$ where \$C_0\$ is the capacitance of the open-end of the coax probe, and \$C_f\$ is the fringing capacitance. How is it possible to find \$C_0\$ and \$C_f\$ from the measurement …
asked May 29 by T. Pluess