Best way of impedance measurement ?
Best way of impedance measurement ?
(OP)
What is the best way to measure the impedance(S11 with network analyzer), (for example the output matched impedance of a PA) at high frequencies (above 5 GHz) with the minimum errors due to low impedance, parasitic capacitance, and soldered connector influence ?





RE: Best way of impedance measurement ?
Seen some network analyzers on eBay lately.
Gunnar Englund
www.gke.org
RE: Best way of impedance measurement ?
RE: Best way of impedance measurement ?
Gunnar Englund
www.gke.org
RE: Best way of impedance measurement ?
The thing you are trying to measure is source match or source reflection coefficient. One way is to use a long cable and sweep the input frequency. You then need a power or voltage detector on the output. The cable changes the reflected signal phase continuously as the frequency is swept. This method is good for wideband sources.
If you have a narrow band source then you need a directional coupler, a power meter and a sliding short circuit. This kit is more than 10x cheaper than a VNA and gives a better answer.
RE: Best way of impedance measurement ?
I have a liquid nano structure that I would like to analyze it's permeability and permittivity in order to perhaps explain it optical/light scattering/sound altering properties. HP only sells them up to the GHz range.
I am a biochemist. I do not have a clue.
RE: Best way of impedance measurement ?
However people also make optical spectrum analysers (OSA)
h
http://www.npl.co.uk/photonics/training/osa.html
Once you have an optical source (laser) and an OSA you can start to make insertion loss measurements.