what is the meaning of S-PARAMETER for a RF transistor?

Question

i need to know the manufacturer of this type of transistor

Answer 1

S-parameters explained:
http://www.sss-mag.com/spara.html#spar

For audio and low-frequency (lower than UHF and microwave) transistors, the hybrid-pi model is widely used and the parameters of the hybrid-pi model are quoted in datasheets. For UHF and microwave frequencies, the hybrid-pi model is of little use, so s-parameters are used for calculations.

You didn't give us the number for the transistor, so we can't look up the manufacturer.

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Answer 2

Scattering parameters. They are used in high frequency circuits to characterize circuits and substrates. The reason they are used instead of the usual H, Y or Z parameters is that the H,Y and Z parameters require opening and shorting inputs and outputs to characterize the circuit. This is not only potentially damaging to active high frequency circuits, it's very difficult to achieve a true open or short; Therefore, scattering parameters were developed. Typically they are gotten by using a piece of equipment called a Network Analyzer.