Hybrid parameters vs. frequency

Question

The question I need to solve is: how do the h parameters (hybrid) vary as a function of frequency?

In particular, I need to estimate the Y parameters (admitance parameters) for a 2N3904 transistor, but I only have the h parameters, as a function of the collector current, measured with a 1 kHz signal.

I need the Y parameters to model a circuit with this transistor, which operates at 10 Mhz. Is it possible to estimate the Y parameters @ 10 Mhz, from the h parameters @ 1 kHz?

I know that it is possible to convert from h parameters to Y parameters, but I don't know how the frequency variation affects it.

An alternative is to find a datasheet where the admittance parameters are specified for a range of frequencies, but I have searched without result.

Answer 1

Z, Y, H, S parameters are "measured" values at a specific bias and frequency.

You can convert H to Y but the bias and frequency is the same.

So 1Khz H can only be converted to 1Khz Y.

Answer 2

You seem to want to convert h parameters to Y parameters in a two port network. Depending on how you connect the transistor to measure these two port parameters, you can convert one type of parameters to another such as h to Y or to Z or T.You can use the conversion matrix of two port parameters to convert from h to Y. First, you have to setup your equations to measure any of the two port parameters such as h or Y. All of these parameters would be at the same frequency.