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Title: Radio-Wave Propagation ppt
Page Link: Radio-Wave Propagation ppt -
Posted By: seminar tips
Created at: Tuesday 20th of November 2012 10:55:34 AM
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Radio-Wave Propagation




Introduction


Radio waves are one form of electromagnetic radiation
Electromagnetic radiation has a dual nature:
In some cases, it behaves as waves
In other cases, it behaves as particles (photons)
For radio frequencies the wave model is generally more appropriate
Electromagnetic waves can be generated by many means, but all them involve the movement of electrical charges


Electric and Magnetic Fields



An el ....etc

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Title: Ground wave propagation
Page Link: Ground wave propagation -
Posted By: seminar ideas
Created at: Friday 01st of June 2012 07:26:37 AM
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Ground wave propagation



The waves, which while traveling , glide over the earth’s surface are called ground waves.
Ground waves are always vertically polarized and induce charges in the earth.
The number and polarity of these charges keep on changing with the intensity and location of the wave field.
This variation causes the constitution of the current.


Plane Earth Reflection

For a smooth plane and finitely conducting earth, the magnitude and ph ....etc

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Title: Antenna wave propagation PPT
Page Link: Antenna wave propagation PPT -
Posted By: project girl
Created at: Tuesday 18th of December 2012 06:41:19 AM
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Antenna & wave propagation





Antenna Arrays

Antennas with a given radiation pattern may be arranged in such a way that the pattern yield a different radiation pattern. Like:
Linear array
Circular array
Planar array {rectangular array}
Conformal array {aircraft skin}

Pattern multiplication theorem

Array pattern = array element pattern
array factor .
Array element pattern - the pattern of the individual array ....etc

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Title: RADIO WAVE PROPAGATION
Page Link: RADIO WAVE PROPAGATION -
Posted By: seminar flower
Created at: Tuesday 19th of June 2012 09:43:19 AM
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RADIO WAVE PROPAGATION


PROPAGATION

Propagation: How radio waves travel from point A to point B;
and the events occurring in the transmission path that affect the communications between the points, stations, or operators.
When the electrons in a conductor, (antenna wire) are made to oscillate back and forth, Electromagnetic Waves (EM waves) are produced.
These waves radiate outwards from the source at the speed of light, 300 million meters per second.
Light waves (waves ....etc

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Title: Introduction to Microwave Engineering and EM wave Propagation
Page Link: Introduction to Microwave Engineering and EM wave Propagation -
Posted By: seminar tips
Created at: Tuesday 18th of December 2012 11:40:57 AM
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Introduction to Microwave Engineering and EM wave Propagation



A few reasons for using RF/Microwaves:

Wider bandwidth due to higher frequency
Smaller component size leading to smaller systems
More available frequency spectrum with low interference.
Better resolution for radars due to smaller wavelengths
High antenna gain possible in a smaller space

Some Disadvantages in using RF/Microwaves:

More expensive components ....etc

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Title: The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite
Page Link: The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite -
Posted By: seminar flower
Created at: Wednesday 24th of October 2012 05:38:18 AM
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The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite Materials

ABSTRACT

Multilayer materials consisting of ceramic and glass/epoxy with a rubber interlayer have been subjected to a high strain
rate compression using a split-Hopkinson Pressure Bar (SHPB). The feasibility of modeling stress wave propagation in
complex multilayer materials has been demonstrated. It has been shown that the effects of lateral confinement of a normally
low-modulus ....etc

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Title: Wave Propagation in a Volume Hologram with Multiple Diffraction Gratings
Page Link: Wave Propagation in a Volume Hologram with Multiple Diffraction Gratings -
Posted By: seminar flower
Created at: Wednesday 24th of October 2012 08:38:59 AM
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Wave Propagation in a Volume Hologram with Multiple Diffraction Gratings

ABSTRACT

In the last 10 years, Bragg diffraction gratings have been developed at CREOL using photo-thermo-refractive (PTR) glass,
which is not sensitive to radiation or temperatures to 400 degrees C, and can withstand high-intensity laser beams without
damage or change in the Bragg angle. In this work, a new type of Bragg grating, not yet fabricated, is being studied to predict
its properties. It is c ....etc

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Title: ANTENNAS AND WAVE PROPAGATION pdf
Page Link: ANTENNAS AND WAVE PROPAGATION pdf -
Posted By: project girl
Created at: Tuesday 13th of November 2012 12:04:12 PM
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ANTENNAS AND WAVE PROPAGATION



Propagation Mechanism

Reflection - occurs when signal encounters a surface that is large relative to the wavelength of the signal
Refraction - When there is a transition from one medium to another.
Diffraction - occurs at the edge of an impenetrable body that is large compared to wavelength of radio wave.
Scattering – occurs when incoming signal hits an object whose size in the order of the wavelength of the signal or l ....etc

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Title: III BTech I Semester Regular Examinations - ANTENNAS AND WAVE PROPAGATION
Page Link: III BTech I Semester Regular Examinations - ANTENNAS AND WAVE PROPAGATION -
Posted By: seminar flower
Created at: Tuesday 30th of October 2012 07:20:22 AM
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III B.Tech I Semester Regular Examinations - ANTENNAS AND WAVE PROPAGATION



1. (a) Draw the Dual characteristics of an antenna.
(b) Explain the Radiation from Two wire.
2. (a) Derive the expressions for electric field in case of short current element and
hence obtain the conditions for the field to be in Franhofer region.
(b) Find the distance from a radiating element with 60Hz current such that radi-
ation and induction fields are equal.
3. (a) ....etc

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Title: 7EC1- ANTENNA WAVE PROPAGATION
Page Link: 7EC1- ANTENNA WAVE PROPAGATION -
Posted By: seminar addict
Created at: Thursday 12th of January 2012 09:38:54 AM
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7EC1- ANTENNA & WAVE PROPAGATION



UNIT 1 : ANTENNA FUNDAMENTALS
- Antenna parameters, Radiation from a current element in free
space. Quarter & half wave antenna. Reciprocity theorem. Resonant and non-resonant antenna. Effective
length and aperature, gain, beamwidth, directivity, radiation resistance, efficiency, polarization,
impedance and directional characteristics of antenna, antenna temperature.
.
UNIT 3 : ANTENNAS -
V and Rhombic antennas, Folded dipole, Y ....etc

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