The Microwaves talks

In the present times in which the phantom for radio frequency  is being small for the increasing demand of telecommunications, the incursion in the field of the microwaves is natural.
It is necessary to also take into account that exists some applications that are exclusive of the frequencies of microwaves

Applications of the microwaves
During World War II, to speak of the Radar was synonymous of microwaves. At this time the development of systems of microwaves received a great stimulus, due to the necessity of a radar of hi-res able to detect enemy airplanes and boats.
At present the use of systems of microwaves is most important and their applications include air traffic control, marine navigation, control of missiles, aviation, telecommunications, between many others.
In the last years the frequencies of microwaves are used more and more in telecommunications:
- In earth, the telecommunications with microwaves are used more and more using repeating, necessary antennas throughout a way or passage of communication
- In the space, the satellites are used like relay station, repeater stations of microwaves. These satellites have an enormous capacity and the new generations of satellites will be still more powerful.
The satellite communicationses, are becoming very important in the commercial area. Many television stations relay to everybody by means of satellites. The signal that these emit can catch in moved away places, where the service of traditional television does not exist.
Frequencies and wavelength
The microwaves include/understand frequencies that work in the rank from the 109 to 1012 Hertz, which they correspond to wavelengths which they go of the 30 cm. (centimeters) to 0,3 mm (millimeters). These wavelengths are of the same order of magnitude that the dimensions of the circuits used in its generation.
Due to the smallness of the wavelengths, the time of propagation of the electrical effects from a point to another one in the circuit, is comparable with the period and oscillating loads of the system.
As a result of the previous thing, an analysis by means of the law of currents of Kirchoff and the law of tension of Kirchoff and the conventional concepts of tension and current to LF suitably do not describe the electrical phenomena that occur in a circuit of microwaves.
In addition an analysis to a circuit of this type must consider associated the magnetic fields and electrical to this device.