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lambjx
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does an em wave with circular polarization behave like a coil, i.e. do perpendicular electromagnetic fields join internally? I am very confused on this subject
Watch this video. It's short and informative. Pay attention to the green arrow representing the resultant.lambjx said:Summary:: how does a wave with circular polarization behave?
does an em wave with circular polarization behave like a coil, i.e. do perpendicular electromagnetic fields join internally? I am very confused on this subject
so if I understand correctly, in the conductor that receives the circular wave, its electrons have a circular motion? similar to that of a reel?kuruman said:Watch this video. It's short and informative. Pay attention to the green arrow representing the resultant.
No. There is no conductor. The electromagnetic wave is a disturbance that propagates in vacuum. The net electric field vector characterizing this disturbance rotates in space as the wave propagates. If the wave is incident on a conductor the electrons will accelerate opposite to whatever direction the electric field points.lambjx said:so if I understand correctly, in the conductor that receives the circular wave, its electrons have a circular motion? similar to that of a reel?
therefore the electrons incident on the conductor do not follow a rotating path, but go up and down always changing direction ??kuruman said:No. There is no conductor. The electromagnetic wave is a disturbance that propagates in vacuum. The net electric field vector characterizing this disturbance rotates in space as the wave propagates. If the wave is incident on a conductor the electrons will accelerate opposite to whatever direction the electric field points.
There are no electrons in an EM wave, so there are no electrons incident on anything. There's no conductor in your OP either - are you trying to consider the effect of an EM wave incident on a plane conductive surface?lambjx said:therefore the electrons incident on the conductor do not follow a rotating path, but go up and down always changing direction ??
guys i know that there are no electrons in an em wave, i just wanted to say if a circularly polarized em wave, when it hits a surface in this case can be flat, can generate a movement of electrons or ions, circular. I ask because I have seen that the helix antennas have a coil configurationIbix said:There are no electrons in an EM wave, so there are no electrons incident on anything. There's no conductor in your OP either - are you trying to consider the effect of an EM wave incident on a plane conductive surface?
Ibix said:There are no electrons in an EM wave, so there are no electrons incident on anything. There's no conductor in your OP either - are you trying to consider the effect of an EM wave incident on a plane conductive surface?
I believe that particular question was answered in posts #2 and #4. Following these posts, you started talking about electrons in a conductor. If your question is about helical antennas, then perhaps this Wikipedia article might help.lambjx said:how does a wave with circular polarization behave?
A good way to look at circularly polarised em waves to to think in terms of (very common) transmitting aerials that can produce CP. Take two dipoles, mounted at right angles (along x and y axes). Feed them with two RF signals (same frequency of course) in such a way that the two signals are in quadrature (90° phase difference). If you go along the z axis the signals will add together to produce circular polarisation. The direction of the E field sweeps around the z axis at the same frequency as the separate signals from the two dipoles.lambjx said:guys i know that there are no electrons in an em wave, i just wanted to say if a circularly polarized em wave, when it hits a surface in this case can be flat, can generate a movement of electrons or ions, circular. I ask because I have seen that the helix antennas have a coil configuration
Circular polarization is a type of wave motion where the electric field vector rotates in a circular pattern as the wave propagates through space. This is in contrast to linear polarization, where the electric field vector oscillates in a straight line.
A circularly polarized wave behaves like a combination of two perpendicular linearly polarized waves, one with a clockwise rotation and the other with a counterclockwise rotation. This results in a wave that appears to spiral as it propagates.
In right-handed circular polarization, the electric field vector rotates in a clockwise direction as the wave propagates. In left-handed circular polarization, the electric field vector rotates in a counterclockwise direction. This difference is determined by the direction of the magnetic field vector.
Circular polarization can be produced by passing a linearly polarized wave through a special type of filter called a quarter-wave plate. This plate delays one component of the wave by a quarter of a wavelength, resulting in a circularly polarized wave.
Circular polarization is used in various technologies, such as satellite communications, radar systems, and 3D glasses. It is also commonly used in optical microscopy to enhance contrast and in polarized sunglasses to reduce glare.