Investigation of bandpass filters in the time domain signal analysis of reverberation chamber

The time domain response of a reverberation chamber plays an important role in many applications. It is normally obtained from the inverse Fourier transform of the measured S-parameters in the frequency domain, and a bandpass filter (BPF) is normally used to select the frequency band of interest. However, the selection of the BPF has rarely been discussed and is a question in practice. In this paper, different types of BPFs are investigated, results from measurement data are given and compared. The interference from the input signal using different filters is quantified and it is found that the extraction of chamber decay constant is not sensitive to the type of employed filters. But for some applications the BPF selection is important.