In electrodynamics, circular polarization of electromagnetic what is radar circular polarization radiation is a polarization such that the tip of the electric field vector, at a fixed point in space, describes a circle as time progresses. The name is derived from this fact. The electric vector, at one point in time, describes a helix along the direction circular polarization versus linear of wave propagation (see the polarization article for pictures). The magnitude of the electric field vector is constant as it rotates. Circular polarization is a limiting case of linear to circular polarization calculation the more general condition of elliptical polarization. The other special case is the easier-to-understand linear polarization.
Circular (and circular polarization antennas elliptical) polarization is possible because the propagating electric (and magnetic) fields can have two orthogonal components with independent amplitudes and phases (and the same frequency).
A circularly polarized wave may be resolved into two linearly polarized satellite circular polarization ku waves, of equal amplitude, in phase circular polarization quadrature (90 degrees apart) and with their planes of polarization at right angles to each other.
Circular polarization may be referred to as right or left, depending on the direction in which the electric field vector rotates. When looking toward the source, right hand circular polarized light rotates counter-clockwise as time increases. It describes a left handed helix along the propagation axis though. The difference in these terms stems from the first definitions of polarizations, which was defined looking into the source, while the handedness circular polarization versus linear antennas or helicity is defined along the direction of the light.
FM radio
The term "circular polarization" is linear circular polarization relation often used erroneously to describe mixed polarity signals used mostly in FM radio (87,5 to 108,0 polarization circular MHz), where a vertical and a horizontal component are propagated simultaneously by a single or a combined array. This has the effect of producing greater penetration into buildings and difficult reception areas than a signal with just one plane of polarisation.
See also
- Federal Standard 1037C
- Linear polarization
- MIL-STD-188
- Polarization
Electronics Topics
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
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