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GATE EC 2018 Exam: Electromagnetics Quiz 6
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Question 1
The directivity of an antenna array can be increased by adding more antenna elements, as a larger number of elements
Question 2
The radiation pattern of an antenna in spherical co-ordinates is given by
The directivity of the antenna is
The directivity of the antenna is
Question 3
At 20GHz, the gain of a parabolic dish antenna of 1 meter diameter and 70% efficiency is
Question 4
If the diameter of a 
dipole antenna is increased from 
, then its
dipole antenna is increased from , then its Question 5
For a Hertz dipole antenna, the half power beam width (HPBW) in the E-plane is
Question 6
Two identical and parallel dipole antennas are kept apart by a distance of 
in the H-plane. They are fed with equal currents but right most antenna has a phase shift of +90 °. The radiation pattern is given as
in the H-plane. They are fed with equal currents but right most antenna has a phase shift of +90 °. The radiation pattern is given as Question 7
Two half-wave dipole antennas placed as shown in the figure are excited with sinusoidally varying currents of frequency 3 MHz and phase shift of π/2 between them (the element at the origin leads in phase). If the maximum radiated E-field at the point P in the x-y plane occurs at an azimuthal angle of 60o the distance d (in meters) between the antennas is ____________.
Question 8
A 
dipole is kept horizontally at a height of 
above a perfectly conducting infinite ground plane. The Radiation Pattern in the plane of the dipolw (
plane) looks approximately as
dipole is kept horizontally at a height of above a perfectly conducting infinite ground plane. The Radiation Pattern in the plane of the dipolw (plane) looks approximately as Question 9
Two identical transmitting and receiving antenna operating at 9 GHz are repeated by 10 Km. The received power must be at least 10
to meet the signal-to-noise ratio of the receiver. Assume the two antenna are aligned for maximum reception to each other. If the input power to the transmitting antenna is 10 W, then gain of each antenna must be atleast ____dB
to meet the signal-to-noise ratio of the receiver. Assume the two antenna are aligned for maximum reception to each other. If the input power to the transmitting antenna is 10 W, then gain of each antenna must be atleast ____dB Question 10
A ramp input applied to a unity feedback system results in 5% steady state error. The type number and zero frequency gain of the system are respectively.
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