Polarised photons have their electric field vector in a specified orientation (eg. Horizontal or Vertical).
In an ionised medium in the presence of a magnetic field, a radio wave is split into two circularly polarised components, each propagating independently. In the ionosphere a radio wave is split by the Earth's magnetic field into ordinary (o) and extra-ordinary (x) waves. The partitioning of the wave energy between the two depends on the angle the wave makes with the magnetic field. At low frequencies, the x-wave is heavily attenuated relative to the o-wave.
The alignment of all the oscillations of a transverse wave in one direction.
the phenomenon in which waves of light or other radiation are restricted in direction of vibration
A wave is polarised when all the vibrations are absorbed except those in one plane.
Polarisation is a characteristic of an electromagnetic wave. Such waves can be horizontally, vertically or circularly polarised. Polarisation can be thought of as the plane in which the electrical component of the electromagnetic wave vibrates (oscillate).
The direction of the electrical and magnetic fields of a signal. Satellites use both vertical and horizontal polarisation. This means that a given frequency range can be used twice.
The way the electrical field of a signal is organised. The SIRIUS Satellite System broadcast signals with the same frequencies but with two different polarisation (the Horizontal and the Vertical) to make an efficient use of the available spectrum.
A technique used by the satellite designer to increase the capacity of the satellite transmission channels by reusing the satellite transponder frequencies. In linear cross polarisation schemes, half of the transponders beam their signals to the Earth in a vertically polarised mode, the other half are horizontally polarised. Although the two sets of frequencies overlap, the polarisation separation is sufficient to ensure they do not interfere with each other. To successfully receive and decode these signals on the Earth, the earth station must be outfitted with a properly polarised feedhorn to select the vertically or horizontally polarised signals as desired.
The phenomenon in which radio waves are restricted to certain directions of electrical and magnetic field variations, where these directions are perpendicular to the direction of wave travel. By convention, the polarisation of a radio wave is defined by the direction of the electric field vector. Four senses of polarisation are used in satellite transmissions: horizontal (X) linear polarisation, vertical (Y) linear polarisation, right-hand circular polarisation and left-hand circular polarisation.
The division of beams of light into separate planes or vectors by means of polarising filters (first practically applied by Edwin Land of the Polaroid company in the 1930s). When two vectors are crossed at right angles, vision or light rays are obscured. By polarising the light from two projectors in opposite vectors, and by providing viewers with spectacles having similarly polarising filters, each image from a stereo pair - when projected onto a type of screen surface which does not then depolarise the light rays - is seen only by the left and right eye respectively.
The direction of vibration of the electrical field vector of electromagnetic radiation.
