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In which of the following region of the log periodic array, maximum radiation takes place?

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In which of the following region of the log periodic array, maximum radiation takes place?

(a) Inactive transmission line region

(b) Active region

(c) Inactive stop region

(d) Reflective region

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My doubt stems from Frequency Independent Antenna in division Frequency Independent Antenna of Antennas

1 Answer

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The correct answer is (b) Active region

Explanation: In LPDA, the length of dipole \(L=\frac{λ}{2} \)  comes under active region. These region dipoles offer resistive impedance. Here currents are large and are in phase with the base voltage. Inactive stop region is also called as reflective region.In Inactive transmission line region \(L < \frac{λ}{2}\)  offers Capacitive Impedance and Inactive stop region \(L > \frac{λ}{2} \)  offers Inductive impedance.

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