EC > GATE 2016 SET-1 > Antennas
The far-zone power density radiated by a helical antenna is approximated as: Wrad≈Waverage≈ârC0(1/r2)cos4θ. The radiated power density is symmetrical with respect to φ and exists only in the upper hemisphere: 0≤θ≤π/2; 0≤φ≤2π; C0 is a constant. The power radiated by the antenna (in watts) and the maximum directivity of the antenna, respectively, are
Correct : b
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