Official PYQ · 2016Set 1 · Q55Transmission LinesMCQ2 marks

GATE EC 2016 Set 1 Q55 — Transmission Lines

The far-zone power density radiated by a helical antenna is approximated as:

${\overrightarrow W_{rad}= \overrightarrow W_{average} \approx \hat {a_r}C_0\frac{1}{r^2}\cos^4\theta}$

The radiated power density is symmetrical with respect to $\phi$ and exists only in the upper hemisphere: $0\leq\theta\leq\frac{\pi}{2}; \: 0\leq\phi\leq 2\pi$ ; $C_0$ is a constant. The power radiated by the antenna (in watts) and the maximum directivity of the antenna, respectively, are

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Published 10 Oct 2026

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