Constant-k T-section and Π-section prototype filter circuits are shown in Fig. 16.13-1.
Consider the T-section filter. The first capacitor presents high impedance at low
frequency, while the inductor presents low impedance. This results in considerable attenuation
of the signal at the inductor node. The filter is usually terminated at a load resistance. The
high impedance of the second capacitor (high compared to load resistance) further chokes
even the little voltage developed at that point at low frequencies. Thus, the signal appearing
across the output is a doubly attenuated version and is quite ...
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