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LEFT-HAND CIRCULAR [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2010-03-01

English

Subject field(s)
  • Waveguides
  • Radio Waves
CONT

A simplified waveguide switch is disclosed having a rotatable quarter wave plate for generating selected amounts of right-hand and left-hand circular polarized waves.

OBS

waveguide switch: term standardized by the International Electrotechnical Commission (IEC).

French

Domaine(s)
  • Guides d'ondes
  • Ondes radioélectriques
OBS

commutateur de guide d'ondes : terme normalisé par la Commission électrotechnique internationale (CEI).

Spanish

Campo(s) temático(s)
  • Guías de ondas
  • Ondas radioeléctricas
Save record 1

Record 2 - external organization data 2009-07-30

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.92 (19762)
ISO/IEC standard entry number
DEF

polarization of a propagating wave is determined by the locus or path described by the electric field vector with respect to time

OBS

Polarization is a term that often arises in the literature and when considering radio frequency communication and RFID. If we ascribe an x, y, z co-ordinate system to a propagating wave as illustrated below, with the direction of propagation being in the z direction, the electric field vector E will be in the x, y plane. If E remains in the same orientation with respect to time, so that its locus describes a straight line, the wave is said to be linearly polarized. However, if the locus describes a circular motion with respect to time the wave is said to be circularly polarized. Where the locus describes an elliptical path, the wave is said to be elliptically polarized.

OBS

Circular polarization is often used in communication systems since the orientation of the transmitting and receiving antenna is less important than it is with linearly polarized waves. The magnetic vector, H, always remains perpendicular to the E vector. Using an IEEE convention, a clockwise circular rotating wavefront approaching a receiver is defined as being left-hand circular(LHC) polarized. The power in the wavefront is expressed in the form of the Poynting vector, P : P=(E x H)=E x H sin..., where... is the phase angle between E and H.

OBS

polarization summary: term and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

French

Spanish

Save record 2

Record 3 2008-05-23

English

Subject field(s)
  • Electrical Engineering
  • Telecommunications
CONT

The most common form of elliptical polarization is that of circular polarization, and it occurs when the tip of the rotating electric vector traces a circle in space as it travels away from the observer. Two classifications of circular polarization are right-hand circular and left-hand circular... In right-hand circular polarization, the electric vector rotates in a clockwise direction as the electric vector travels away from the observer...

Key term(s)
  • right-hand circular polarization
  • right-hand circular polarisation

French

Domaine(s)
  • Électrotechnique
  • Télécommunications
DEF

[Onde] à polarisation elliptique ou circulaire, dans laquelle le vecteur champ électrique, observé dans un plan fixe quelconque normal à la direction de propagation, tourne vers la droite (sens horaire) dans le temps quand on regarde dans la direction de propagation.

Spanish

Campo(s) temático(s)
  • Electrotecnia
  • Telecomunicaciones
CONT

Mirando a la dirección de rotación del vector campo eléctrico desde la dirección en la que el haz se propaga, si esta dirección es en el sentido de las agujas del reloj, se trata de polarización circular derecha. Si esta dirección es en sentido contrario al de las agujas del reloj, ésta es llamada polarización circular izquierda.

Save record 3

Record 4 2007-01-26

English

Subject field(s)
  • Space Exploration Equipment and Tools
  • Spacecraft
CONT

The above deck equipment is usually some form of tracking dish, with a circular polarized feed arrangement. This usually takes the form of an helical antenna, wound with left-hand circular polarization. The signal from the satellite is right-hand circular polarization, but since the signal is reflected by the dish, polarization sense is reversed. This is the same principle as if you were to look in a mirror; your image is reversed.

OBS

Inmarsat satellite.

French

Domaine(s)
  • Équipement et outillage d'exploration spatiale
  • Engins spatiaux

Spanish

Save record 4

Record 5 2004-05-17

English

Subject field(s)
  • Electrical Engineering
  • Telecommunications
CONT

The most common form of elliptical polarization is that of circular polarization, and it occurs when the tip of the rotating electric vector traces a circle in space as it travels away from the observer. Two classifications of circular polarization are right-hand circular and left-hand circular.. In left-hand circular polarization, the electric vector rotates in a counterclockwise direction...

Key term(s)
  • left-hand circular polarisation

French

Domaine(s)
  • Électrotechnique
  • Télécommunications
DEF

Onde à polarisation elliptique ou circulaire dans laquelle le vecteur champ électrique, observé dans un plan fixe quelconque normal à la direction de propagation, tourne vers la gauche (sens antihoraire) dans le temps quand on regarde dans la direction de propagation.

OBS

Aujourd'hui, l'expression «polarisation circulaire gauche» est la plus employée.

Spanish

Campo(s) temático(s)
  • Electrotecnia
  • Telecomunicaciones
Save record 5

Record 6 2002-12-16

English

Subject field(s)
  • Hand Tools
CONT

The duckbill tin snip is designed especially for cutting intricate patterns and curves. It will make straight, irregular, or circular cuts in sheet metal, screening, or leather, and is suitable for either right-or left-hand use.

Key term(s)
  • duck bill snip
  • duckbill tin snip

French

Domaine(s)
  • Outillage à main
DEF

Pince spécialement conçue pour couper les motifs compliqués et les courbes. Elle assure des coupes droites, irrégulières ou circulaires dans la tôle, les moustiquaires, ou le cuir, et elle convient pour les droitiers ou les gauchers.

Key term(s)
  • pince à bec de canard

Spanish

Save record 6

Record 7 1994-12-13

English

Subject field(s)
  • Computers and Calculators
  • Applications of Automation
  • Telecommunications Facilities

French

Domaine(s)
  • Ordinateurs et calculateurs
  • Automatisation et applications
  • Installations de télécommunications
OBS

Acronyme spécifique à RADARSAT accepté par le Comité d'uniformisation de la terminologie spatiale.

Spanish

Save record 7

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