Antenna frequency

The frequency is one of the most important concepts in the universe. It is also very important in antenna theory. Fortunately, this concept is not very complex.

Beginner class:

Send or receive electromagnetic (EM) wave function of the antenna. These examples of electromagnetic waves including wave received by the light from the sun, and your cell phone. Your eyes to detect a particular frequency of electromagnetic receiving antenna. You see the color (red, green, blue), each wave of red and blue just your eyes can detect waves of different frequencies

All electromagnetic waves in the air or the same speed propagation in space. This speed mph, about $ 671 million (1 billion kilometers per hour). This speed is called speed of light. This rate is about 1 million attained during acoustic faster. The speed of light will write the equation for the "C". We will measure the meters, within a few seconds of time, and the length of the masses in kilograms. We should remember that the next equation.

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Defined frequency, we must define what is an electromagnetic wave. This is the propagation of an electric field away from some source (antenna, the sun, a radio tower, whatever). Driving electric field and magnetic field. These two areas, the formation of an electromagnetic wave.

The universe to allow these waves to take any shape. But the most important shape of a sine wave. This is plotted in Figure 1. Electromagnetic waves with position and time. Spatial variation shown in Figure 1. Time changes shown in Figure 2.

The wave is periodic. Wave to repeat the "T" seconds. Plotted as a function of space, the waves repeat, given in meters:

This is called the wavelength. Frequency (write "F") is just the number of periodic wave in one second (two hundred cycles to complete (as is a function of time) per second written to 200 Hz or 200 Hz "). In mathematics, which is written in the following formula.

How fast someone to walk the steps depends on them (wavelength) multiplied by the steps they take, the rate (frequency). The wave travels a similar speed. How fast wave oscillation ("F") multiplied by the steps taken by the waves of the size of each period () gives the speed. Should keep in mind the following formula: please Click hereto get our dipole antenna

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In summary, the frequency is to measure how fast the wave oscillation period. All electromagnetic waves travel at the same rate. Therefore, if the speed of an electromagnetic wave oscillation time than wave, the faster the wave must also have a shorter wavelength. Longer wavelength means lower frequency.

When I was young I still remember the frequency of discussion by scientists, and never understood the importance of However, the frequency of vital importance. This will further the "more advanced" frequency part of the explanation.