16.12 m-DERIVED HALF-SECTIONS FOR FILTER TERMINATION
The problem of unsatisfactory attenuation performance in the stop-band in the prototype filter has been addressed satisfactorily in the previous section. The problem of non-zero attenuation in the pass-band due to imperfect termination at the filter output remains. We are constrained to load the filter by a load resistance RL from a practical point of view. We will, of course, make Ro equal to RL, but that will result in Zo-termination only at DC frequency. We address this issue in the current section.
The solution lies in interposing a two-port reactive network between the filter output and the load resistance. This network should have a property such that its input impedance is ZoT (we assume ...
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