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GATE 2019: Electromagnetics Quiz 11
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Question 1
An antenna has a single main lobe pointing in the y-direction.The half power beam widths in Z and x directions are 300 and 300 respectively. The approximate Directivity of the antenna is
Question 2
An antenna of diameter 2m is operating at 3 GHz.The minimum distance beyond which the inductive Electrostatic contribution to the radiated fields can be neglected is given by________m.
Question 3
The electric field strength incident on a half-wave dipole antenna in free space having a directivity of 1.56 is 9 mV/m at 50 MHz. The maximum power received by the antenna is given by
Question 4
An antenna is fed with 200
W power. The efficiency of the antenna is 75%. If the radiation pattern of the antenna is pattern of the antenna is 
for 
(azimuth angle) and 
(elevation angle). =0 elsewhere
Find the radiation intensity in the direction of maximum radiation
W power. The efficiency of the antenna is 75%. If the radiation pattern of the antenna is pattern of the antenna is for (azimuth angle) and (elevation angle). =0 elsewhere Find the radiation intensity in the direction of maximum radiation
Question 5
An interface (z = 0) between two different materials contains a uniform surface charge density ρs = 
C/
. Electric field intensity in material (1) occupying the left of an interface (z < 0) with Ɛ1 = 4 Ɛ0 is Ē = 10 âx + 2 ây – 10 âz V/m. The electric field intensity in material (2) occupying the right of interface (z > 0) with Ɛ2 = 2 Ɛ0 is
C/. Electric field intensity in material (1) occupying the left of an interface (z < 0) with Ɛ1 = 4 Ɛ0 is Ē = 10 âx + 2 ây – 10 âz V/m. The electric field intensity in material (2) occupying the right of interface (z > 0) with Ɛ2 = 2 Ɛ0 is Question 6
A power of 100 W is supplied to an isotropic radiator. The electric field intensity at a point 10 km away is
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