Television receiver antenna is usually
In figure the current distribution is represented by
Half power point directions for broadside is
What will happen to a bird sitting on a conductor?
Which one is correct option?
Given that , if the radiation intensity of an antenna is proportional to sin2 θ, where θ is the elevation angle, the antenna directivity will be
The term critical frequency denotes
The important postulate arising out of Maxwell's modification of Ampere's law is
Which of the following is not a wideband antenna?
The polarization phenomena in Faraday rotation
The portion of the atmosphere closest to ground is called ionosphere.
Which of the following relations is valid for a spherical surface?
When there is rapid attenuation of field inside the conductor, the field current are concentrated close to the surface of the conductor; this phenomenon is called
Which antenna is frequently used for local area transmission at UHF/VHF?
The work done in moving a charge Q on an equipotential line for a distance d will be
For frequency up to 1650 kHz, the transmitting antenna is used a
Radar antennas are
Which of the following is high frequency transmission line?
Which of the following are the properties of a medium?
In microwave communication, some times, microwave signals reach large distances by following the earth curvature. This phenomenon is called
An antenna is synonymous to a
Alternating current can induce voltage because it has magnetic field which is
Which of the following frequencies cannot be used for reliable beyond-the-horizon terrestrial communications without repeaters?
Maximum effective aperture (Ae)max of short dipole antenna is
Beamwidth of an antenna depends upon