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A combined band reject filter and trap can be formed of an inexpensive single element, and is effective over a wide frequency range.
English (United States)
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High Frequency Filter and Trap
A combined band reject filter and trap can be formed of an inexpensive
single element, and is effective over a wide frequency range.
In Fig. 1, a length of coaxial cable 1 is coiled to form an inductor. An end 2 of
the center conductor 3 is soldered to the opposite end 4 of the outer conductor 5.
The remaining ends 6, 7 of the two conductors serve as input and output
This configuration uses the uniform capacitance of two parallel conductors,
the inductance of coiled turns, and the coupling due to magnetic induction. Fig. 2
shows a schematic of an equivalent circuit, and Fig. 3 is a schematic diagram of
the actual circuit. As seen in Fig. 3, the induced current in the secondary is
opposite to the source current. At the resonant frequency there is a high
"circulating current" that enhances coupling, further improving the tank's
opposition to current flow.
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