millimetre$513801$ - significado y definición. Qué es millimetre$513801$
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Qué (quién) es millimetre$513801$ - definición

THE 30-300 GHZ RANGE OF THE ELECTROMAGNETIC SPECTRUM
Millimeter band; Millimetre band; Millimeter wave; Millimetre wave; Mm-wave; Mm wave; Millimeter-wave; Millimetric wave; Millimetre Wave; Extremely High Frequency; MmW; Millimeter wave guidance; G band (IEEE); MmWave; MmWaves; Millimeter waves; Millimetre-wave
  • A CableFree MMW link installed in the UAE installed for [[Safe City]] applications, providing 1Gbit/s capacity between sites. The links are fast to deploy and have a lower cost than fibre optics.
  • Atmospheric attenuation in dB/km as a function of frequency over the EHF band. Peaks in absorption at specific frequencies are a problem, due to atmosphere constituents such as [[water]] vapour (H<sub>2</sub>O) and molecular [[oxygen]] (O<sub>2</sub>). The vertical scale is logarithmic.
  • Soviet aircraft carrier ''Minsk'']]
  • Part of the [[Atacama Large Millimeter Array]] (ALMA), a millimeter wave [[radio telescope]]

Centimetre or millimetre of water         
UNIT OF PRESSURE
Cmh2o; CmH2O; Centimeter of water; Centimeters of water; Centimetres of water; Millimeters, water gauge; Mm.Wg; Meters, water gauge; Cm H2O; MmWG; Metre of water; Meter of water; Centimetre of water; Millimetre of water; Centimetre or Millimetre of water
A centimetre or millimetre of water (US spelling centimeter or millimeter of water) are less commonly used measures of pressure derived from pressure head.
Millimeter         
UNIT OF LENGTH 1/1000TH OF A METRE
Millimeter; Milimetre; Millimetres; Millimeters; Milimeter; ㎜; Metric line; Mm (metric unit); Mm (SI unit); Mm (unit); Mondo point; Millimiter
·noun ·Alt. of Millimetre.
Millimetre         
UNIT OF LENGTH 1/1000TH OF A METRE
Millimeter; Milimetre; Millimetres; Millimeters; Milimeter; ㎜; Metric line; Mm (metric unit); Mm (SI unit); Mm (unit); Mondo point; Millimiter
·noun A lineal measure in the metric system, containing the thousandth part of a meter; equal to 0.03937 of an inch. ·see 3d Meter.

Wikipedia

Extremely high frequency

Extremely high frequency (EHF) is the International Telecommunication Union (ITU) designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz). It lies between the super high frequency band and the far infrared band, the lower part of which is the terahertz band. Radio waves in this band have wavelengths from ten to one millimetre, so it is also called the millimetre band and radiation in this band is called millimetre waves, sometimes abbreviated MMW or mmWave. Millimetre-length electromagnetic waves were first investigated by Indian physicist Jagadish Chandra Bose, who generated waves of frequency up to 60 GHz during experiments in 1894–1896.

Compared to lower bands, radio waves in this band have high atmospheric attenuation: they are absorbed by the gases in the atmosphere. Absorption increases with frequency until at the top end of the band the waves are attenuated to zero within a few meters. Absorption by humidity in the atmosphere is significant except in desert environments, and attenuation by rain (rain fade) is a serious problem even over short distances. However the short propagation range allows smaller frequency reuse distances than lower frequencies. The short wavelength allows modest size antennas to have a small beam width, further increasing frequency reuse potential. Millimeter waves are used for military fire-control radar, airport security scanners, short range wireless networks, and scientific research.

In a major new application of millimeter waves, certain frequency ranges near the bottom of the band are being used in the newest generation of cell phone networks, 5G networks. The design of millimeter-wave circuit and subsystems (such as antennas, power amplifiers, mixers and oscillators) also presents severe challenges to engineers due to semiconductor and process limitations, model limitations and poor Q factors of passive devices.