"Wireless" products, from remote control cars to cellular telephones, use a form of energy known as electromagnetic radiation to carry signals. The signals can be the pattern of vibrations commonly experienced as sound by the human ear. Or they can be the abrupt changes of frequency or intensity used to encode data signals. Whichever, electromagnetic radiation carries them through free space. We will get into this in detail in a moment. First, let's describe the four most common forms of wireless technologies: satellite, microwave, infrared, and radio communications.
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