Q1) Answer by true or false for ten of the following items, and correct the false one 4- The smooth walls horn antenna has smaller sidelobe level compared to corrugated horn antenna. 5. The parabolic surface, which is obtained by rotating a parabolic curve on its axis, satisfies the equation (y=f6x). 6- Typical methods used for array synthesis are, the cosine tapering and cosine squared tappering 7- The condition for bending the electromagnetic waves down to earth is curvature of the earth. 8- The main reason that causing travelling wave attenuation, is the presence of ionized layers

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Q1) Answer by true or false for ten of the following items, and correct
the false one
4- The smooth walls horn antenna has smaller sidelobe
level compared to corrugated horn antenna.
5. The parabolic surface, which is obtained by rotating a
parabolic curve on its axis, satisfies the equation
(y=f6x).
6- Typical methods used for array synthesis are, the
cosine tapering and cosine squared tappering
7- The condition for bending the electromagnetic waves
down to earth is curvature of the earth. 8- The main
reason that causing travelling wave attenuation, is the
presence of ionized
layers
9- The reception of long sky wave is better through the
night than the daytime because of the radiation of the
sun.
10- The propagation of short sky wave depends on
some factors, which are eddy currents,
clouds, and gamma rays.
11- The methods used for VHF propagation are
tropospheric scatter, ionospheric scatier,
and meteor trails.
12- Trapping usually occurs at millimeters wavelengths.
13-lonization columns produced by meteors in the
E-layer region are capable of reflecting
waves. The meteor trails are either of high density or of
low density. The probability of occurrence of the latter is
high..
Transcribed Image Text:Q1) Answer by true or false for ten of the following items, and correct the false one 4- The smooth walls horn antenna has smaller sidelobe level compared to corrugated horn antenna. 5. The parabolic surface, which is obtained by rotating a parabolic curve on its axis, satisfies the equation (y=f6x). 6- Typical methods used for array synthesis are, the cosine tapering and cosine squared tappering 7- The condition for bending the electromagnetic waves down to earth is curvature of the earth. 8- The main reason that causing travelling wave attenuation, is the presence of ionized layers 9- The reception of long sky wave is better through the night than the daytime because of the radiation of the sun. 10- The propagation of short sky wave depends on some factors, which are eddy currents, clouds, and gamma rays. 11- The methods used for VHF propagation are tropospheric scatter, ionospheric scatier, and meteor trails. 12- Trapping usually occurs at millimeters wavelengths. 13-lonization columns produced by meteors in the E-layer region are capable of reflecting waves. The meteor trails are either of high density or of low density. The probability of occurrence of the latter is high..
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