Radio frequency Totally Explained

Everything about Radio Frequency totally explained

Radio frequency (RF) is a frequency or rate of oscillation within the range of about 3 Hz to 300 GHz. This range corresponds to frequency of alternating current electrical signals used to produce and detect radio waves. Since most of this range is beyond the vibration rate that most mechanical systems can respond to, RF usually refers to oscillations in electrical circuits or electromagnetic radiation.

Special properties of RF electrical signals

Electrical currents that oscillate at RF have special properties not shared by direct current signals. One such property is the ease with which it can ionize air to create a conductive path through air. This property is exploited by 'high frequency' units used in electric arc welding. Another special property is an electromagnetic force that drives the RF current to the surface of conductors, known as the skin effect. Another property is the ability to appear to flow through paths that contain insulating material, like the dielectric insulator of a capacitor. The degree of effect of these properties depends on the frequency of the signals.

Frequencies

Name	Symbol	Applications
Extremely low frequency	ELF	audible 20+ Hz, communication with submarines
Super low frequency	SLF	audible, AC power grids (50 hertz and 60 hertz)
Ultra low frequency	ULF	audible, communication with mines
Very low frequency	VLF	audible range 20 Hz to 20 kHz (to be audible, energy must be simply converted to sound)
Low frequency	LF	international broadcasting, navigational beacons, lowFER
Medium frequency	MF	navigational beacons, AM broadcasting, maritime and aviation communication
High frequency	HF	shortwave, citizens' band radio
Very high frequency	VHF	FM broadcasting, broadcast television, aviation
Ultra high frequency	UHF	broadcast television, mobile telephones, wireless networking, microwave ovens
Super high frequency	SHF	wireless networking, radar, satellite links.
Extremely high frequency	EHF	microwave data links, radio astronomy, remote sensing, advanced weapons systems, advanced security scanning

Further Information

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