How are radio waves transmitted using an antenna?
What will be an ideal response?
Radio waves are usually transmitted and received using an antenna. An antenna is a length of copper wire, or similar material, with one end free and the other end connected to a receiver or transmitter. When transmitting, the radio waves created by the electronic circuit of the transmitter are fed to this antenna wire. This sets up an electrical pressure (voltage) along the wire, which will cause a small electrical current to flow into the antenna. Because the current is alternating, it flows back and forth in the antenna at the same frequency as the radio waves. When the electricity moves back and forth in the antenna at the same frequency as the radio waves, it creates both a magnetic field and an electrical field around the antenna. This continuous (analog) combination of magnetism and electrical pressure moves away (propagates) from the antenna the same way that water waves move away from the point of impact when you throw a rock in a pond. The result is an electromagnetic wave (EM wave).
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