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Area Radio wave propagation / Electromagnetic properties of propagation media

IEV ref 705-03-07

en
dielectric (medium)
the medium in which a variable electric field produces an electric current density vector J MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meWabaGacmaadaWaaiWabaabaiaafaaakeaadaWhcaqaaiaadseaaiaawEniaaaa@3C07@ whose magnitude in a given direction is small relative to that of the vector D t MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meWabaGacmGadiWaaiWabiabciaafiaakeaadaWcaaqaaiabgkGi2oaaFiaabaGaamiraaGaay51GaaabaGaeyOaIyRaamiDaaaaaaa@3FE6@ in a particular frequency band

Note 1 – For a sinusoidal wave in an isotropic medium, the medium is dielectric if the following relation is satisfied:

σ ε 0 ω ε r MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meqabaGacmGadiWaaiWabiabciaafiaakeaadaWcaaqaaiabeo8aZbqaaiabew7aLnaaBaaaleaacaqGVbaabeaakiabeM8a3baacqWIQjspcuaH1oqzgaqbamaaBaaaleaacaGGYbaabeaaaaa@4430@

where ε r MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiabew7aLnaaDaaale aacaqGYbaabaGaaiOkaaaaaaa@38C7@ is the relative real permittivity, ε0 is the electric constant, σ is the conductivity, ω is the angular frequency.

Note 2 – An anisotropic medium may be dielectric only in certain directions.


fr
(milieu) diélectrique, m
milieu dans lequel un champ électrique variable produit un vecteur densité de courant électrique J MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meWabaGacmaadaWaaiWabaabaiaafaaakeaadaWhcaqaaiaadseaaiaawEniaaaa@3C07@ dont la projection selon une direction donnée a une norme petite par rapport à celle de la projection du vecteur D t MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meWabaGacmGadiWaaiWabiabciaafiaakeaadaWcaaqaaiabgkGi2oaaFiaabaGaamiraaGaay51GaaabaGaeyOaIyRaamiDaaaaaaa@3FE6@ dans une bande de fréquences déterminée

Note 1 – Pour un milieu isotrope, la propriété d'être diélectrique se traduit en régime sinusoïdal par la condition:

σ ε 0 ω ε r MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meqabaGacmGadiWaaiWabiabciaafiaakeaadaWcaaqaaiabeo8aZbqaaiabew7aLnaaBaaaleaacaqGVbaabeaakiabeM8a3baacqWIQjspcuaH1oqzgaqbamaaBaaaleaacaGGYbaabeaaaaa@4430@

ε r MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiabew7aLnaaDaaale aacaqGYbaabaGaaiOkaaaaaaa@38C7@ est la permittivité relative réelle, ε0 est la constante électrique, σ est la conductivité, ω est la pulsation.

Note 2 – Un milieu anisotrope peut n'être diélectrique que dans certaines directions.


ar
وسط عزل كهربائي

de
Dielektrikum, n

es
(medio) dieléctrico

it
dielettrico (mezzo)

ko
유전 매질
유전체

ja
誘電体
誘電媒質

pl
dielektryk

pt
(meio) dieléctrico

sv
dielektrikum

Publication date: 1995-09
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