GATE Electronics and Communication Engineering Practice Quiz

Question 1

A lossless half-wave dipole in free space is center-fed with a sinusoidal current. Which statement about its far-field radiation pattern is correct?

Accepted Answer

It has maximum radiation broadside to the dipole and nulls along the dipole axis.

Question 2

The polarization of an electromagnetic wave is determined by the time-varying behavior of which field quantity at a fixed point in space?

Accepted Answer

Electric field vector E

Question 3

A parabolic reflector antenna operates at fixed aperture area A and aperture efficiency eta_a. If the operating frequency is doubled, its gain approximately

Accepted Answer

Becomes four times

Question 4

For a rectangular microstrip patch antenna operating in the dominant TM10 mode, the patch length L is approximately chosen as

Accepted Answer

lambda_g/2 in the effective dielectric medium

Question 5

A Hertzian dipole of length l carries current I0. In the far field, which quantity varies inversely with distance r from the antenna?

Accepted Answer

Electric and magnetic field amplitudes

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