GATE EC 2016 Set 1 — Question 65

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MCQ+2 / -0.67MediumRadiation PatternAntennasElectromagneticsGain, Directivity & Radiation Resistance

Electromagnetics → Antennas → Gain, Directivity & Radiation Resistance

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The far-zone power density radiated by a helical antenna is approximated as:Wrad=Waveragea^rC01r2cos4θ\vec{W}_{rad} = \vec{W}_{average} \approx \hat{a}_r C_0 \frac{1}{r^2} \cos^4 \thetaThe radiated power density is symmetrical with respect to ϕ\phi and exists only in the upper hemisphere: 0θπ20 \leq \theta \leq \frac{\pi}{2}; 0ϕ2π0 \leq \phi \leq 2\pi; C0C_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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