https://www.mathworks.com/help/rfpcb/ug/stepped-impedance-maximally-flat-low-pass-filter-for-microwave-applications.html
Stepped Impedance Maximally Flat Lowpass Filter for Microwave Applications - MATLAB & Simulink
Comparison of S-parameters of simulated and lumped element stepped impedance low pass filter for X-band applications.
maximally flatlowpass filtermicrowave applicationssteppedimpedance