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PROPERTIES OF RADIOFREQUENCY

The term radiofrequency or RF, is applied to the portion of the electromagnetic spectrum in which electromagnetic waves can be generated applying alternate current to an antenna. Radiofrequency is a type of electromagnetic radiation located at 1 GHz and 30 KHz, with a wavelength between 1 m and 10 km wide.

Over 1 GHz, the bandwidth enters in the microwave spectrum. Over 300 GHz, absorption of the electromagnetic radiation through the terrestrial atmosphere is so high that the atmosphere becomes opaque to it until, in the degrees of infrared and optical frequency it becomes transparent again.

Radiofrequency can be divided into the following spectrum bands according to its frequency: Ultra-high, very high, short wave, medium wave, long wave and very low frequency.

Those used for a non-ablative effect in aesthetic medicine are found between the medium and short waves.

It is a type of electromagnetic wave.

Electromagnetic waves are able to travel through the void, as opposed to the mechanical waves that need a physical medium to do so

As its name implies, electromagnetic radiation is comprised of electric and magnetic charge. There is an enormous range of waves and they are differentiated by their frequency.

Two important features of electromagnetic radiations are:

• Photonic energy.
• Propagation speed.

(The transmission speed of these radiations is also the same, 300,000 Km/s, without considering its frequency or power).

Espectro electromagnético. Source: http://www.astronomia2009.es

Electromagnetic radiation is understood as the transport of energy through particles (quanta) through space. These particles are displaced following a wave-like motion which gives rise to a wave, transporting electric and magnetic energy.

The particles (quanta) change according to their electric charge and this conditions their wavelength, giving different types of electromagnetic radiation according to those charges. The electromagnetic phenomena are described more easily by whether they are associated or not to photons or elementary particles. This is what is defined in physics as wave-particle duality of electromagnetic radiation. The higher an electromagnetic wave, the higher energy of its associated particle. Photons associated to x-rays and gamma rays have a high energy content, while those associated to extremely low radiations have very low energy content. Ultraviolet radiation, visible radiation, infrared radiation, microwaves and radiofrequency are between these two extremes. The quanta associated to these radiations has an intermediate energetic charge.

Light is a type of electromagnetic radiation in which the particles are photons, the energy is transmitted by photons. Within the electromagnetic radiation spectrum, laser is in the range of wavelengths situated between ultraviolet light and infrared light (between 280 nm and 1,000,000 nm). Towards the right are the shorter wavelengths, the gamma rays and towards the left we can find the microwaves and radiofrequency.

	Longitud de la Onda	Frecuencia	Energía
Gamma Rays	< 10 pm	> 30.0 EHz	> 19.9E-15 J
X-rays	< 10 nm	> 30.0 PHz	> 19.9E-18 J
Extreme ultraviolet	< 200 nm	> 1.5 PHz	> 993E-21 J
Near ultraviolet	< 380 nm	> 789 THz	> 523E-21 J
Visible Light	< 780 nm	> 384 THz	> 255E-21 J
Near-infrared	< 2.5 um	> 120 THz	> 79.5E-21 J
Mid-infrared	< 50 um	> 6.00 THz	> 3.98E-21 J
Far-infrared	< 1 mm	> 300 GHz	> 199E-24 J
Microwaves	< 30 cm	> 1.0 GHz	> 1.99e-24 J
Ultra high radiofrequency	< 1 m	> 300 MHz	> 1.99e-25 J
Very high radiofrequency	< 10 m	> 30 MHz	> 2.05e-26 J
Short wave radio	< 180 m	> 1.7 MHz	> 1.13e-27 J
Medium wave radio	< 650 m	> 650 kHz	> 4.31e-28 J
Long wave radio	< 10 km	> 30 kHz	> 1.98e-29 J
Very low radiofrequency	> 10 km	< 30 kHz	< 1.99e-29 J

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