Antennas And Wave Propagation By John D Kraus 4th Edition Free ((EXCLUSIVE)) 208

Radio waves have many desirable properties for long-distance communication. For example, radio waves propagate easily through the earth and have low attenuation over long distances. In addition, the earth is an almost perfect reflector of radio waves, so radio waves propagate straight through the earth and are reflected back by objects in space.[12]

The first radio communication was made by the German physicist Heinrich Hertz in 1888, when he sent radio waves through a spark gap transmitter. The transmitter was damaged, and he connected the transmitting antenna directly to the receiver instead of using a wave guide. As a result, the radio waves were not properly guided through the spark gap. Hertz received his first successful radio signals by connecting a tuning fork receiver to the spark gap transmitter instead of using a wave guide.[12]

Continuous waves are the easiest type of waves for communication, because they do not fluctuate much and so are easy to detect. Continuous waves are the signal that is transmitted for long periods of time, and the receiver can detect this signal by a special filter or a mixer. This type of wave is very wideband, and is a special form of the radio frequency signal (RF).

Travelling at the speed of light, radio waves have the potential to reach any place on Earth in a single hop. A radio wave reaching the ground travels through the ionosphere to a distant satellite, and then back through the earth. This is possible because the ionosphere is a medium that can transmit radio waves. Radio waves can also be reflected back to the earth by the upper atmosphere, known as the ionosphere. These reflections are called the ionospheric reflection.

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