120. Which antenna does not depend on frequency?
A. Yagi-Uda
B. Folded-dipole
C. Log periodic antenna
D. None of the above
121. The parabolic and lens antennas are used extensively at
A. SW
B. MW
C. Microwaves
D. All of the above
122. The radiation pattern of helical antenna (axial mode) is represented by
A. figure A
B. figure B
C. figure C
D. figure D
123. In E-plane metal plate lens antenna
A. travelling wave fronts are retarded
B. tavelling wave front are accelerated
C. travelling wave front remains unaffected
D. None of the above
124. In H-plane metal plate lens the travelling wave front is
A. totally retarded
B. retarded
C. accelerated
D. neither accelerated nor retarded
125. Antenna radiation efficiency is given by Radiation resistance
A. Antenna resistance
B. Antenna resistance
C. Radiation resistance
D.Maximum power gain
126. Antenna aperture efficiency is given by
A. DX2
B.47cDX2
C. 47cA
D. 4nA
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