Radio frequency

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(Redirected from Radio waves)

RF can also denote rheumatoid factor

Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. Such frequencies account for the following parts of the spectrum:

Band name Abbr ITU band Frequencies Wavelength

Below 3 Hz > 100,000 km

Extremely low frequency
ELF

1
3-300 Hz 100,000 km – 1000 km

Ultra low frequency
ULF

2
300–3000 Hz 1000 km – 100 km

Very low frequency
VLF

3
3–30 kHz 100 km – 10 km

Low frequency
LF

4
30–300 kHz 10 km – 1 km

Medium frequency
MF

5
300–3000 kHz 1 km – 100 m

High frequency
HF

6
3–30 MHz 100 m – 10 m

Very high frequency
VHF

7
30–300 MHz 10 m – 1 m

Ultra high frequency
UHF

8
300–3000 MHz 1 m – 100 mm

Super high frequency
SHF

9
3–30 GHz 100 mm – 10 mm

Extremely high frequency
EHF

10
30–300 GHz 10 mm – 1 mm

Above 300 GHz < 1 mm

Note: above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that the atmosphere is effectively opaque to higher frequencies of electromagnetic radiation, until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges.

The ELF, SLF, ULF, and VLF bands overlap the AF (audio frequency) spectrum, which is approximately 20–20,000 Hz. However, sounds move at the speed of sound, rather than the speed of light.

Electrical connectors designed to work at radio frequencies are known as RF connectors. RF is also the name of a standard audio/video connector, also called BNC (BayoNet Connector).

Table of contents

1 Named Frequency Bands

1.1 Microwave (IEEE US)

2 See also

3 External Link

Named Frequency Bands

Band III - 174–245 MHz
ISM band......specific frequencies vary

Microwave (IEEE US)

L band 1 to 2GHz

S band 2 to 4GHz

C band 4 to 8GHz

X band 8 to 12GHz

K_u band 12 to 18GHz

K band 18 to 26GHz

K_a band 26 to 40GHz

V band 40 to 75GHz

W band 75 to 110GHz