H band
Encyclopedia
H band can refer to two different regions of the electromagnetic spectrum, in the radio and near-infrared.
from 6 GHz
to 8 GHz in the electromagnetic spectrum
. This is equal to wave lengths between 5 cm and 3.75 cm. The H band is in the SHF
range of the radio spectrum
.
The modern H band lies in the C band
(4–8 GHz) of the older IEEE classification system.
In infrared astronomy
, the H band refers to an atmospheric transmission window centred on 1.65 micrometres with a FWHM width of 0.35 micrometres
(in the near-infrared).
Radio
The H band is the range of radio frequenciesRadio frequency
Radio frequency is a rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals...
from 6 GHz
Hertz
The hertz is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of the sine wave, particularly those used in radio and audio applications....
to 8 GHz in the electromagnetic spectrum
Electromagnetic spectrum
The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object....
. This is equal to wave lengths between 5 cm and 3.75 cm. The H band is in the SHF
Super high frequency
Super high frequency refers to radio frequencies in the range of 3 GHz and 30 GHz. This band of frequencies is also known as the centimetre band or centimetre wave as the wavelengths range from ten to one centimetres....
range of the radio spectrum
Radio spectrum
Radio spectrum refers to the part of the electromagnetic spectrum corresponding to radio frequencies – that is, frequencies lower than around 300 GHz ....
.
The modern H band lies in the C band
C band
The C band is a name given to certain portions of the electromagnetic spectrum, including wavelengths of microwaves that are used for long-distance radio telecommunications. The IEEE C-band - and its slight variations - contains frequency ranges that are used for many satellite communications...
(4–8 GHz) of the older IEEE classification system.
Infrared astronomy
Infrared astronomy
Infrared astronomy is the branch of astronomy and astrophysics that studies astronomical objects visible in infrared radiation. The wavelength of infrared light ranges from 0.75 to 300 micrometers...
, the H band refers to an atmospheric transmission window centred on 1.65 micrometres with a FWHM width of 0.35 micrometres
(in the near-infrared).