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.

图1。正弦波绘制成位置的函数。