What is wave propagation in antenna?
The waves, which are transmitted from the transmitter antenna, are reflected from the ionosphere. Such a travel of the wave from transmitter to the ionosphere and from there to the receiver on Earth is known as Sky Wave Propagation.
What are the different types of wave propagation?
Hint: There are three types of modes of propagation of electromagnetic waves: Ground wave propagation, Space wave propagation and Skywave propagation. Electromagnetic waves in the frequency range of a few Hz to about 1011Hz are generally called radio waves.
What are the three 3 modes of radio wave propagation?
The mode of propagation of electromagnetic waves in the atmosphere and in free space may be divided into the following three categories:
- The line of sight (LOS) propagation.
- Ground wave propagation.
- Skywave propagation.
What is wave propagation and its types?
The waves that propagate near the earth’s surface are called GROUND WAVES. This type of propagation is possible when the transmitting and receiving antenna both are closed to the earth’s surface. The ground waves which travel without any reflection are called Direct waves or Space waves.
Why do waves propagate?
Plane wave: We see a wave propagating in the direction of the phase velocity. The wave can be thought to be made up of planes orthogonal to the direction of the phase velocity. Since water waves transport energy, attempts to generate power from them have been made by utilizing the physical motion of such waves.
Which antenna is used by radio waves?
A radio wave is most efficiently radiated from a metal antenna whose length is a suitable fraction of a wavelength, such as half wave, and reception of radio waves is the best when the receiving antenna is also a suitable fraction of a wavelength.
What causes waves to propagate?
In physics a wave can be thought of as a disturbance or oscillation that travels through space-time, accompanied by a transfer of energy. Transverse waves occur when a disturbance causes oscillations perpendicular (at right angles) to the propagation (the direction of energy transfer).
What is theory of propagation?
A theory is developed for the propagation of stress waves in a porous elastic solid containing compressible viscous fluid. The physical interpretation of the result is clarified by treating first the case where the fluid is frictionless.
What is the speed of propagation?
The dielectric constant of a material indicates its ability to store electrical energy. The propagation speed is expressed as a percentage in what way it is relative to the speed of light, which is the ideal propagation speed and occurs in a vacuum.
How do waves propagate?
A wave can be thought of as a disturbance or oscillation that travels through space-time, accompanied by a transfer of energy. The direction a wave propagates is perpendicular to the direction it oscillates for transverse waves. A wave does not move mass in the direction of propagation; it transfers energy.
What are the different types of antenna propagation?
Radio Wave Propagation 1 Line of sight (LOS) propagation 2 Ground wave propagation 3 Sky wave propagation
How big are the waves of an antenna?
–Technically speaking an antenna is a transducer –Usable radio wave are at ~1.5 x 104Hz up to 3 x 1011Hz –A light bulb also converts electrical energy into electromagnetic energy: light at ~5 x 1014Hz Electromagnetic Waves
What are the four modes of radio propagation?
•There are four basic modes of getting a radio wave from the transmitting to a receiving antenna: –Ground Wave –Space Wave –Sky Wave –Satellite Communication (SATCOM) •The frequency of the radio wave is of primary importance in considering the performance of each type of propagation Ground-Wave Propagation
How are waves transmitted from the transmitter antenna?
Hence, it is an example of broadcasting. The waves, which are transmitted from the transmitter antenna, are reflected from the ionosphere. It consists of several layers of charged particles ranging in altitude from 30- 250 miles above the surface of the earth.