A somewhat rare type of filter in the passive element format. However this chebychev type has proved very usefull as a transmitter harmonic filter.
Use the zero's to filter the harmonics of a Band II transmitter. Adjust the order (N) and stop band attenuation to get the minimum thro' loss and yet achieve
harmonic suppression. The variant of zero's from series resonant LC is the best practical choice. Note: Even order filters are modified to include an infinity pole. This
means fstop will be moved slightly upwards in frequency. ENSURE CALCULATED before continuing.