A novel UWB bandpass filter topology with broad stopband rejection is proposed. The experiment filter has 122% 3-dB bandwidth, less than 1.5 dB in-band insert losses, the variation of group delay less than 0.2 ns, and a wide stopband bandwidth with 17 dB attenuation up to 20 GHz. The design method is that the broadband stopband filter is internally embedded within the section between two short-circuited stubs of the broadband bandpass filter, which is not increase the size. With the lowpass and bandpass filter designed separately, the method is more convenient and easily implemented. This compact and high performance lowpass filter should be useful for many broad system applications.
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