GATE EC 2017 Set 1 — Question 55
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Electromagnetics → Antennas → Dipole & Monopole Antennas
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Question
A half wavelength dipole is kept in the - plane and oriented along from the -axis. Determine the direction of null in the radiation pattern for . Here the angle () is measured from the -axis, and the angle () is measured from the -axis in the - plane.
Correct answer
(A) θ = 90^, φ = 45^
Solution
A half-wave dipole has its radiation nulls along its axis. The dipole is placed in the - plane, which corresponds to . It is oriented at an angle of with respect to the -axis in the - plane, meaning its axis lies along the direction (and ). Since we are looking for the null in the range , the direction of the null is and .
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