undesirable frequencies find a low impedance path through the series-tuned circuits and a high impedance path through

the parallel-tuned circuits. Thus, the undesirable band of frequencies are rejected or suppressed. The narrow band of

desired frequencies find a high impedance path through the series-tuned circuit and a low impedance path through the

parallel-tuned circuit, which is passed on to the load.

impedance path toward the load and a low impedance path through the series-tuned circuit to ground (figure 2-14).

**-section. **This series-tuned tank circuit (figure 2-15) has maximum line current flow at the resonant frequency, and

the parallel-tuned tank has minimum current flow in the line at resonance. The combination of a parallel and two

shunting series tanks makes an easy path to ground for undesirable frequency currents. The -section filter with

carefully selected components, can reject a very narrow band of frequencies, because, as with all filters, the more tanks,

the sharper will be the sides of the pass band.

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