band pass filter

I'm trying to simulate pulse transmitted through bandpass filter (actually ,it is APD that has band pass type frequency response)

One of the problem is that the frequency respons is not like a typical band pass filter.

It is like a high-pass filter for low frequency and,like a low-pass filter

for high frequency.

I don't know how to get the

transfer function of such a filter,

Can I just multiply transfer funtions of two-filters?

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sperelat
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