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Strip lines are used at
Antenna used for direction finding is
The phase velocity in a coaxial line is
A parabolic antenna produces a radiation pattern which is
Ground wave propagation is useful for
Antenna used for T.V. broadcasting is
During day time ionosphere consist of
The absorption of EM wave by the atmosphere depends on
Microwave signals follow the curvature of the earth and the phenomenon
The effective height of a vertical radiator can be increased by
Which of the wave remains unaffected whether it is a day or night?
Broadcasting antennas are generally
In order to receive a vertical polarized wave, the conductor of the dipole should be mounted
The relative permittivity of the ionosphere at ratio frequencies is
Velocity of the wave when it passes from air into sphere
T.V. broadcasting based on
Tropospheric mode of propagation is used in
A very reliable service has to be established between two points on earth separated by 1000 km. The band that will be used as
Long distance short wave radio broadcasting based on
If WF is the Fermi level, then in a metal at T = 0
The virtual height of an ionospheric layer is __________ true height
MUF is depend upon
In an home T.V. receiver, the leed in from the antenna is
Which one of following is correct for broadside array?
For broadside array, maxima will be obtain at
Half power point directions for broadside is
An end fire array consisting of several half-wave lengths of directive gain 40, then array length will be
An antenna array pattern is to used for increasing
If t is relaxation time and tc is average time between collisions, then in an isotropic metal
The input impedance for folded dipole antenna (two half dipole) is
Which one is not correct for folded dipole antenna?
In cellphone communication base antennas are connected to other base antennas in
The radiation resistance of a rod tubing antenna is
Antenna beamwidth is
Directivity and beamwidth is related as
Maximum effective aperture (Ae)max of short dipole antenna is
Radiation resistance of half-wave dipole (λ/2) antenna is in free space
Parabolic and lens antenna used at
Which of following antenna does not depend upon the frequency?
Beamwidth of an antenna depends upon