Radio - Wikipedia
网页They are generated by an electronic device called a transmitter connected to an antenna which radiates oscillating electrical energy, often characterized as a wave. They can be received by other antennas connected to a radio receiver, this is the fundamental principle of radio communication.
How Radio Works - HowStuffWorks
网页2023年5月30日 · You don't see them, but countless high frequency waves are bouncing through the air around you every day. They facilitate wireless communication for things like car radios, smartphones, and Wi-Fi internet. Thanks to radio, data transmission between people is faster and more convenient than ever.
Radio wave - Wikipedia
网页Radio waves are a type of electromagnetic radiation with the lowest frequencies and the longest wavelengths in the electromagnetic spectrum, typically with frequencies below 300 gigahertz (GHz) and wavelengths greater than 1 millimeter (3⁄64 …
Radio technology | History, Principles, Types, & Facts
网页Radio technology, transmission and detection of communication signals consisting of electromagnetic waves that travel through the air in a straight line or by reflection from the ionosphere or from a communications satellite. Learn more about the history, development, and principles of radio technology in this article.
Electromagnetic radiation - Radio Waves, Frequency, Wavelength
网页2024年9月13日 · Radio waves are used for wireless transmission of sound messages, or information, for communication, as well as for maritime and aircraft navigation. The information is imposed on the electromagnetic carrier wave as amplitude modulation (AM) or as frequency modulation (FM) or in digital form (pulse modulation).
Radio spectrum - Wikipedia
网页The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.
Radio wave | Examples, Uses, Facts, & Range | Britannica
网页2024年7月26日 · Radio-wave communications signals travel through the air in a straight line, reflect off of clouds or layers of the ionosphere, or are relayed by satellites in space. They are used in standard broadcast radio and television, shortwave radio, navigation and air-traffic control, cellular telephony, and even remote
Radio and digital radio | How it works | AM and FM compared
网页2022年5月20日 · Digital radio, as it's called, sends speech and songs through the air as strings of numbers. No matter what comes between your radio and the transmitter, the signal almost always gets through. That's why digital radio sounds better.
Understanding Radio Waves and their Frequencies
网页Radio waves are electromagnetic waves that have the longest wavelengths in the electromagnetic spectrum. They are produced by the acceleration of electric charges, such as the movement of electrons in an antenna.
Radio Waves - Science@NASA
网页2016年8月10日 · Radio telescopes look toward the heavens to view planets, comets, giant clouds of gas and dust, stars, and galaxies. By studying the radio waves originating from these sources, astronomers can learn about their composition, structure, and motion. Radio astronomy has the advantage that sunlight, clouds, and rain do not affect observations.
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