Propagation Mode of Radio Waves
As the carrier of information dissemination in wireless communication, radio waves are ubiquitous in real life. Wireless broadcasting, wireless TV, satellite communications, mobile communications, radar, and wireless IP MESH networking equipment are all related to the application of radio waves.
The propagation environment of radio waves is very complex, including free space (an ideal infinite, isotropic radio wave propagation, vacuum or lossless uniform medium space, which is a scientific abstraction proposed to simplify the problem research) propagation and medium (earth crust, sea water, atmosphere, etc.) propagation.
And radio waves have a variety of propagation methods, including almost all the processes of radio wave propagation, such as: direct radiation, reflection, refraction, diffraction, scattering, etc.
Direct radiation
Direct radiation is the way radio waves travel in free space. There is no reflection, refraction, diffraction, dispersion and absorption of radio waves in free space.
Reflection
When the electromagnetic wave encounters an object much larger than the wavelength, the phenomenon of reflection (changing the direction of propagation at the interface between the two media and returning to the original medium) occurs.
Refraction
When an electromagnetic wave enters another medium from one medium, the propagation direction changes (a certain angle is formed with the original direction, but it does not return to the original medium).
Diffraction
When the propagation route between the wireless transmitter and receiver is blocked by an obstacle, the radio wave continues to travel around the edge of the obstacle. Diffraction enables radio signals to be propagated behind obstacles.
Scattering
Due to the inhomogeneity of the propagation medium - such as large curvature, roughness, etc., the phenomenon of electromagnetic waves spreading to the surroundings is caused. Scattering occurs when there are objects smaller than the wavelength in the propagation path, and the number of such obstructing objects per unit volume is very large.
In a typical cellular mobile communication environment, communication between a cellular base station and a mobile station is not through a direct path, but through many other paths. During the propagation of radio waves, different objects will be encountered, so in addition to direct radiation, different reflections, refraction and scattering will also occur. These signals arriving at the receiver through different propagation paths have different amplitudes and phases. Their combined effect will cause the signal received by the receiver to become very complicated, and even cause interference or distortion, that is, multi-path propagation effect.
How to use radio waves for communication?
The principle of using radio waves for video transmission is to convert video signals into electromagnetic waves and transmit them through the antenna. After receiving the electromagnetic waves, the antenna at the receiving end converts them into original video signals. Radio communication, mobile phone communication, satellite communication, etc. are all carried out using electromagnetic waves. Among them, electromagnetic waves of different frequencies can be used for different communication methods. For example, radio waves are widely used in broadcasting, television, and radio communications, while microwaves are used in radar, satellite communications, and mobile communications, among other things.
IWAVE headquarters and R&D center are located in Shanghai. It is a national high-tech enterprise focusing on high-end wireless transmission solutions. The company's core personnel come from top international communication companies, all of whom have more than 8 to 15 years of work experience in wireless communication fields. IWAVE is committed to developing and providing high-definition wireless video transmission systems and wireless broadband IP MESH networks. Its products have the advantages of long transmission distance, low latency, stable transmission for complex environments, and have been widely used in drones, robots, fire emergency, inspection, security and other special fields.
Post time: Aug-11-2023
