What is antenna wave propagation?

What is antenna wave propagation?

In radio engineering, an antenna or aerial is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.

Which type of antenna is suitable for ground wave propagation?

Explanation: If the wave is horizontally polarized, then the electric field is short circuited by the earth. So the ground wave is always vertically polarized and vertical antennas are used.

What are the factors affecting space wave propagation?

Space wave propagation limitations

• These waves are affected by the curvature of the earth.
• The propagation of these waves happens along the line of sight distance which is defined as the distance between the transmitting antenna and the receiving antenna which is also known as the range of communication.

What is the principle of antenna?

How does an antenna work? The antenna at the transmitter generates the radio wave. A voltage at the desired frequency is applied to the antenna. The voltage across the antenna elements and the current through them create the electric and magnetic waves, respectively.

How do wave 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 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.

How does ground wave propagate?

Ground wave propagation is a type of radio propagation which is also known as a surface wave. These waves propagate over the earth’s surface in low and medium frequencies. These are mainly used for transmission between the surface of the earth and the ionosphere.

What is ground wave antenna?

Ground wave propagation is a form of signal propagation where the signal travels over the surface of the ground, and as a result it is used to provide regional coverage on the long and medium wave bands. If the antennas are in the line of sight then there will be a direct wave as well as a reflected signal.

What is the two types of space wave propagation?

Direct Waves: The radio waves that, when transmitted from the transmitting antenna, reach the receiving antenna directly. Ground Reflected Waves: The radio waves that reach the receiving antenna after reflection from the ground.

What is free space wave propagation?

The free space propagation model assumes a transmit antenna and a receive antenna to be located in an otherwise empty environment. Neither absorbing obstacles nor reflecting surfaces are considered. Transmit power is spread over the surface area of a hypothetical sphere.

What is smart antenna technology?

Also known as adaptive antennas, these use an array of antennas in combination with smart signal processing algorithms that track the location of a mobile client device using techniques such as the direction of arrival of a signal.

How does a smart antenna work?

Smart antennas (also known as adaptive array antennas, multiple antennas and, recently, MIMO) are antenna arrays with smart signal processing algorithms used to identify spatial signal signature such as the direction of arrival (DOA) of the signal, and use it to calculate beam forming vectors, to track and locate the …

What is sky-wave propagation?

Sky-Wave Propagation •The ionosphereis a layer of atmosphere from 25 to 250 miles above earth’s surface –Contains charged particles •A Sky Wave is a radio wave that is radiated from a transmitting antenna in a direction toward the ionosphere –One of the most frequently used methods for long- distance transmission

What is ground-wave propagation?

Ground-Wave Propagation •AGround Wave(aka Surface Wave) is a radio wave that travels along earth’s surface due to diffraction •It travels better traveling over a conductive surface such as sea water •Losses increase with increasing frequency – not very effective above 2 MHz

What is space wave propagation – Cont’d?

Space-Wave Propagation –Cont’d •Ghostingis a condition that occurs when the same signal arrives at a TV receiver at two different times; the reflected signal travels farther and is weaker than the direct signal, resulting in double image (see Fig 13-8) Figure 13-6Direct and ground reflected space waves.

What are the best books on antenna design and design?

There are many books depending on your requirement. If you are interested in covering all types of antennas go for Antenna theory and design by Constantine A. Balanis (or) Modern Antenna Design by Thomas Milligan. , Some people collect stamps. I collect planar cellular antenna shapes.