EC > GATE 2020 > Antennas and Wave Propagation
For an infinitesimally small dipole in free space, the electric field Eθ in the far field is proportional to (e⁻jkr/r)sinθ, where k=2π/λ. A vertical infinitesimally small electric dipole (δl≪λ) is placed at a distance h (h>0) above an infinite ideal conducting plane, as shown in the figure. The minimum value of h, for which one of the maxima in the far field radiation pattern occurs at θ=60°, is
Correct : a
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