Radio f

radio f

What is the abbreviation for radio frequency?

For other uses, see RF (disambiguation). Radio frequency ( RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 kHz to around 300 GHz.

What is the frequency of radio waves?

Radio frequency. Radio frequency ( RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around twenty thousand times per second ( 20 kHz) to around three hundred billion times per second ( 300 GHz ).

What is the E and H field of a radio wave?

Diagram of the electric fields (E) and magnetic fields (H) of radio waves emitted by a monopole radio transmitting antenna (small dark vertical line in the center). The E and H fields are perpendicular, as implied by the phase diagram in the lower right.

What is the use of radio frequency in medicine?

In medicine. Radio frequency (RF) energy, in the form of radiating waves or electrical currents, has been used in medical treatments for over 75 years, generally for minimally invasive surgeries using radiofrequency ablation including the treatment of sleep apnea.

What are the different frequencies of the radio spectrum?

Frequency bands. The radio spectrum of frequencies is divided into bands with conventional names designated by the International Telecommunications Union (ITU): Frequencies of 1 GHz and above are conventionally called microwave, while frequencies of 30 GHz and above are designated millimeter wave.

What is an electric current that oscillates at radio frequencies?

Electric currents that oscillate at radio frequencies (RF currents) have special properties not shared by direct current or alternating current of lower frequencies. Energy from RF currents in conductors can radiate into space as electromagnetic waves (radio waves). This is the basis of radio technology.

What is Radio Frequencies? Radio frequencies are all about the oscillation rate of electromagnetic (EM) radio waves within the 3 kHz to 300 GHz range and the alternating currents responsible for transmitting the radio signals. That particular frequency range is what is employed in broadcasting and communication transmissions.

What are the two types of radio waves?

What are E and H fields in electromagnetic waves?

All electromagnetic fields (EM waves) consist of two component fields, electric fields (E fields) and magnetic fields (H fields). E fields and H fields are companions and together make up the total EM field. Where one is, so is the other. Electric field strength (E) is measured in units of volts per meter (V/m).

What is the direction of the magnetic field in radio waves?

The waves magnetic field is perpendicular to the electric field, and the electric and magnetic field are oriented in a right hand sense with respect to the direction of radiation. An antenna emits polarized radio waves, with the polarization determined by the direction of the metal antenna elements.

What are radio waves made of?

Radio waves are electromagnetic radiation. Electromagnetic radiation contains of two components, one electrical and one magnetic. These components create each other, as said above. The red magnetic field creates a blue electric field, which creates the next magnetic field, and so on.

Why are radio waves more widely used than other electromagnetic waves?

The electric field consists of a superposition of right and left rotating fields, resulting in a plane oscillation. Radio waves are more widely used for communication than other electromagnetic waves mainly because of their desirable propagation properties, stemming from their large wavelength.

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