digital channelizer question fft bandpass filter

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s002 wjh
s002 wjh 2018-8-22
in the below video it mention using polyphase filter to downsample/filter, then use FFT, but it says FFT act as bandpass filter? why is that?
https://www.mathworks.com/videos/implementation-of-fpga-based-channelizers-with-matlab-and-simulink-93364.html

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