Eactly!flatulent said:Also power is easier to measure than voltage at these frequencies.
S parameters are based on forward and backward traveling wave amplitudes, which are much more like a voltage than a power!
radiohead said:At RF it is hard to create a good high or low impedance. Therefore people do not think in terms of voltages and currents for RF. The 50 ohm comes from the characteristic impedance of optimized coax.
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