The wideband beam is separated into the eight channels by quasi-optical focusing highpass filters
1] The second step is to generate a highpass filter
with lumped elements, using the simple frequency transformation, [C.
The output filter is a seven-pole Chebyshev highpass filter
with a cutoff frequency of 2 GHz.
In , a UWB bandpass filter was proposed using a combination of lowpass and highpass filters
(HPF), which is convenient to design.
Bandpass filters are composed of cascaded lowpass and highpass filters
, or used to suppress higher order harmonics in lowpass or bandpass filters .