Ultra high frequency band - is electromagnetic radiation, which is in the range between the high frequencies and television frequencies far infrared.In English-speaking countries it is called the microwave range because the wavelength is very small compared with the wave broadcasting.These fluctuations are intermediate between the light emission and the usual radio spectrum, so they have both properties of light and radio waves.As the light emission, they are distributed in the form of a beam and is reflected.Characteristic of such waves and the spread in a straight line, and the overlap of all solid objects.So many antenna radar - is to increase the optical elements in the form of large mirrors or lenses.
It should be noted that the frequency range is similar to the radiation of the broadcasting industry and, accordingly, will be generated by the same methods.Microwave radiation consists of the classical theory of radio waves, so successfully used as a means of communication.However, it is important that it has a higher frequency and thereby can receive more opportunities for transmission of information - this helps increase the effectiveness of communications.The similarity with the light emission helps to be useful for radar and other technology applications.
This frequency range is also used in satellite communications for the transmission of any information over long distances.By means of special electronic devices is amplified and relayed to the microwave signal, which is transmitted to ground stations.The first such base appeared in the 60s of last century, when with their help made broadcast TV broadcasting.
Based on the experience of previous years have been developed for product intercontinental satellite communications.At present, such ultrahigh frequency range helps millions of people to watch thousands of channels on a high quality level.Also it can be used to transmit telephone, television, fax signals and digital data.
In today's ultra-high frequency range - a heat treatment of food at home and food processing plants.The energy that is generated by special powerful lamps, concentrated to a small volume, and thus the heat treatment occurs foods.Thanks to these rays microwaves and microwave ovens operate silently, they are compact and clean.Such devices have been successfully used in the kitchens of the plane, in the w / d dining cars and vending machines on the street, where you need to quickly prepare some meals.
should be noted that a huge role in the study of the electronic properties of various solids is played microwave radiation.The range of the magnetic field helps to free electrons rotate in a plane that is perpendicular to the direction of the magnetic field.In addition, if a solid body to direct microwave radiation, whereas it is strongly absorbed.This phenomenon - a cyclotron resonance, and it can be used to measure the effective electron mass.With such measurements, scientists got a lot of valuable information about semiconductors and electronic properties, as well as the metals and metalloids.
