Research on filter for dual-channel blind signal measurement receiver

The filter is a key part of the dual-channel measurement receiver radio frequency (RF) front end. The amplitude and phase characteristics of the RF filter, in particular the phase characteristics, seriously affect the demodulation of the received signal. In this paper, the factors that influence the linear phase of the filter are analyzed, and a generalized Chebyshev linear phase filter design method based on transmission zero is proposed. Finally, a multi-transmission zero bandpass filter is designed by simulation. The simulation results shows the effectiveness of the design method. The designed filters have the properties of low insertion loss, high stopband suppression, very small group delay fluctuation, low cost.