2017-04-02 11:17
1. Define A Uniform Plane Wave.
Answer: In an uniform plane wave the electric and magnetic field vectors both lie in a plane and all such planes are parallel to each other. Also the amplitu… Read More
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Electromagnetic Theory Concepts & Solved Numerica Blog
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This blog is all about Electromagnetic phenomena which include co-ordinate systems, electrostatics, magnetostatics and much more...
2017-04-02 07:47
01. State Three Ways In Which Forces Due To Magnetic Fields Can Be Experienced?
Answer: There are at least three ways in which force due to magnetic fields can be experienced. The
force ca… Read More
2017-04-01 13:28
01. How Can Materials Be Classified In Terms Of Their Electrical Properties?
Answer: Materials can be classified roughly as conductors (σ >> 1, εr = 1) and dielect… Read More
2017-04-01 10:30
1. What Do You Mean By Dielectric Constant Of A Material ?
Answer: Dielectric constant (k) or relative permittivity (εr) is defined as the ratio of capacitance of a capacitor with d… Read More
2017-03-26 06:49
1. State Stokes Theorem.
Answer: The line integral of a vector around a closed path is equal to the surface integral of the normal component of its curl over any surface bounded by the path… Read More
2017-03-25 09:56
The differences between Conduction Current and displacement current are:
1. Conduction current obeys ohm's law as V = (I / R) but displacement current does not obey ohm's law.
2. Conductio… Read More
2014-03-29 13:44
1) An electric field strength of 10 µV/m is to be measured at an observation point θ = π/2, 500 km from a λ/4 monopole antenna operating in air at 50 MHz.
(a) What is… Read More
2014-01-24 10:59
INDEX
Vector analysis is a mathematical tool with which electromagnetic (EM) concepts are most conveniently expressed. It's important to learn its rules and techniques first applying it… Read More
2014-01-01 15:18
INDEX
Vector analysis is a mathematical tool with which electromagnetic (EM) concepts are most conveniently expressed. It's important to learn its rules and techniques first applying it… Read More
2012-10-08 08:28
Q.4) A 70 Ω lossless line has s = 1.6 and θΓ = 300o. If the line is 0.6λ long, obtain
(a) Γ, ZL, Zin
(b) The distance of the first minimum voltage from the loa… Read More
2012-10-07 17:31
Q.1) A transmission line operating at 500 MHz has Zo = 80Ω, α = 0.04Np/m, β = 1.5 rad/m. Find the line parameters R, L, G and C.
Answer:
Since Zo is real & α … Read More
2012-07-17 16:38
19) At the far field, an antenna produces
Calculate the directive gain and the directivity of the antenna?
SOLUTION:
20) For a thin dipole λ/16 long, f… Read More
2012-07-17 16:21
16) Sketch the normalized E-field and H-field patterns for
a. A half-wave dipole
b. A quarter-wave monopole.
SOLUTION:
a)
b) The same as for λ/2 dipole except that the fields… Read More
2012-07-16 17:22
13) A 1-m-long car radio antenna operates in the AM frequency of 1.5 MHz. How much current is required to transmit 4 W of power?
SOLUTION:
This is a monopole antenna
λ = c / f = (… Read More
2012-07-16 16:56
9) A Hertzian dipole at the origin in free space has dl = 20 cm and I = 10 cos2π107t A, find |Eθs| at the distant point (100, 0, 0).
SOLUTION:
λ = c / f = ( 3 x 108 ) /… Read More
2012-07-16 16:11
6) An antenna in air radiates a total power of 100 kW so that maximum radiated electric field strength of 12 mV/m is measured 20 km from the antenna.
Find its:
(a) Directivity in dB… Read More
2012-07-16 15:56
3) A certain antenna with an efficiency of 95% has maximum radiation intensity of 0.5 W/sr. Calculate its directivity when
(a) The input power is 0.4 W
(b) The radiated power is 0.3 W
SOLUT… Read More
2012-07-16 15:43
1) An electric field strength of 10 µV/m is to be measured at an observation point θ = π/2, 500 km from a λ/4 monopole antenna operating in air at 50 MHz.
(a) What is t… Read More
2012-01-12 08:25
Polarization is defined as the orientation of electric field as a function of direction. The polarization of the radio wave can be defined by direction in which the electric vector E is alig… Read More
2012-01-01 13:03
Polarization is defined as the orientation of electric field as a function of direction. The polarization of the radio wave can be defined by direction in which the electric vector E is alig… Read More
2011-11-12 13:01
Consider a plane wave incident on a short dipole. The wave is assumed to be linearly polarized with electric field in the y direction. The current in the dipole is assumed constant and in th… Read More
2011-11-12 13:01
Consider a plane wave incident on a short dipole. The wave is assumed to be linearly polarized with electric field in the y direction. The current in the dipole is assumed constant and in th… Read More
2011-11-12 12:48
This page contains basic questions and short notes on some of the keywords on antenna theory:
96) What is Antenna matching?
When the antenna is receiving with a load resistance matched to… Read More
2011-11-12 12:24
This page contains basic questions and short notes on some of the keywords on antenna theory:
Aperture represents the area of the antenna confining the effective radiations.
The various t… Read More
2011-11-12 12:20
This page contains basic questions and short notes on some of the keywords on antenna theory:
Aperture represents the area of the antenna confining the effective radiations.
The various t… Read More
2011-11-12 11:53
This page contains basic questions and short notes on some of the keywords on antenna theory:
91) Define Refractive index?
It is defined as n = c / Vp
where n = √εr
92)Def… Read More
2011-11-12 11:33
This page contains basic questions and short notes on some of the keywords on antenna theory:
86) What are the factors that affect the propagation of radio waves?
Curvature of earth.
Earth… Read More
2011-11-12 11:20
This page contains basic questions and short notes on some of the keywords on antenna theory:
81) What is meant by diversity reception?
To minimize the fading and to avoid the multi path… Read More
2011-11-12 11:10
This page contains basic questions and short notes on some of the keywords on antenna theory:
76) What is meant by Space Wave?
It is made up of direct wave and ground reflected wave. Also… Read More
2011-11-12 10:52
This page contains basic questions and short notes on some of the keywords on antenna theory:
71) List the applications of helical antenna?
The applications of helical antenna are:
™……Read More
2011-11-12 10:43
This page contains basic questions and short notes on some of the keywords on antenna theory:
66) What are Electrically large loop antennas?
Electrically Large loop antennas is one in whi… Read More
2011-11-12 10:32
This page contains basic questions and short notes on some of the keywords on antenna theory:
61) What is a loop antenna?
A loop antenna is a radiating coil of any convenient cross-sectio… Read More
2011-11-12 10:15
This page contains basic questions and short notes on some of the keywords on antenna theory:
56) Give the expression for the effective aperture of a short dipole?
The effective aperture… Read More
2011-11-12 09:53
This page contains basic questions and short notes on some of the keywords on antenna theory:
51) What do you understand by retarded current?
Since,the short electric dipole is so short… Read More
2011-11-10 11:17
A short dipole is one in which the field is oscillating because of the oscillating voltage and current. It is called so, because the length of the dipole is short and the current is almost c… Read More
2011-11-10 11:17
A short dipole is one in which the field is oscillating because of the oscillating voltage and current. It is called so, because the length of the dipole is short and the current is almost c… Read More
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