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 R
L
from a practical point of view. We will,
of course, make R
o
equal to R
L
, but that will result in Z
o
-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 ...
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