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Area Radio wave propagation / Influence of propagation on radio communications

IEV ref705-08-05

Symbol
Ao
Lbf

en
free-space basic transmission loss
the transmission loss, usually expressed in decibels, that would occur if the antennas were replaced by isotropic antennas located in a perfectly dielectric, homogeneous, isotropic and unlimited environment, the distance between the antennas being retained

Note – If the distance d between the antennas is much greater than the wavelength λ, the free-space attenuation in decibels will be:

A 0 =20log( 4πd λ ) MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadgeadaWgaaWcbaGaaGimaaqabaGccqGH9aqpcaaIYaGaaGimaiGacYgacaGGVbGaai4zamaabmaabaWaaSaaaeaacaaI0aacdaGae8hWdaNaamizaaqaaiabeU7aSbaaaiaawIcacaGLPaaaaaa@4307@


fr
affaiblissement d'espace libre (d'une liaison radioélectrique) m
affaiblissement de transmission habituellement exprimé en décibels qui serait obtenu si les antennes étaient remplacées par des antennes isotropes placées dans un milieu diélectrique parfait, homogène, isotrope et illimité, la distance entre les antennes étant conservée

Note – Si la distance d entre les antennes est beaucoup plus grande que la longueur d'onde λ, l'affaiblissement d'espace libre est égal, en décibels, à:

A 0 =20log( 4πd λ ) MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadgeadaWgaaWcbaGaaGimaaqabaGccqGH9aqpcaaIYaGaaGimaiGacYgacaGGVbGaai4zamaabmaabaWaaSaaaeaacaaI0aacdaGae8hWdaNaamizaaqaaiabeU7aSbaaaiaawIcacaGLPaaaaaa@4307@


ar
فقد الإرسال الأساسي للحيز المطلق (لوصلة لاسلكية)

de
Freiraumdämpfungsmaß, n

es
pérdida básica por transmisión en el espacio libre

it
attenuazione nello spazio libero (simboli: A0, Lbf)

ko
자유 공간 기본 전송 손실

ja
自由空間基本伝播損

pl
straty transmisyjne podstawowe w wolnej przestrzeni

pt
atenuação básica de transmissão de espaço livre (de uma ligação radioeléctrica)

sv
frirumsförlust

Publication date: 1995-09
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