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A constant k high pass p section has a characteristic impedance of 300 Ω at f = ∞. At f = fc, the characteristic impedance will be?(a) 0(b) ∞(c) 300 Ω(d) More than 300 ΩThis question was posed to me in an international level competition.Origin of the question is Relation between Hybrid Parameters with Short Circuit Admittance and Open Circuit Impedance Parameters in section Two-Port Networks of Network Theory

Answer»

Right option is (b) ∞

The explanation: For constant k HIGH pass p SECTION is given by,

Z = \(\frac{R}{\SQRT{1 – (\frac{f_d}{F})^2}}\)

At f = fd, denominator term is 0.

So, Z = infinite.



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