{"id":36041,"date":"2022-06-10T06:28:17","date_gmt":"2022-06-10T05:28:17","guid":{"rendered":"https:\/\/www.atim.com\/ht-faq\/new-faq-question-2\/"},"modified":"2024-05-13T14:20:37","modified_gmt":"2024-05-13T13:20:37","slug":"new-faq-question-2","status":"publish","type":"ht_faq","link":"https:\/\/www.atim.com\/en\/ht-faq\/new-faq-question-2\/","title":{"rendered":"Comment les ondes radio se propagent-elles dans l’air?"},"content":{"rendered":"

Propagation des ondes radio<\/strong><\/p>\n

Les ondes radio (not\u00e9es\u00a0RF pour\u00a0Radio Frequency) se propagent en ligne droite dans plusieurs directions. La vitesse de propagation des ondes dans le vide est de 3.108<\/span>\u00a0m\/s.
Dans tout autre milieu, le signal subit un affaiblissement d\u00fb \u00e0<\/p>\n

\u2013 la r\u00e9flexion
\u2013 la r\u00e9fraction
\u2013 la diffraction
\u2013 l\u2019absorption<\/p>\n

Absorption des ondes radio<\/strong><\/p>\n

Lorsqu\u2019une onde radio rencontre un obstacle, une partie de son \u00e9nergie est absorb\u00e9e et transform\u00e9e en \u00e9nergie, une partie continue \u00e0 se propager de fa\u00e7on att\u00e9nu\u00e9e et une partie peut \u00e9ventuellement \u00eatre r\u00e9fl\u00e9chie.<\/p>\n

R\u00e9flexion des ondes radio
Lorsqu\u2019une onde radio rencontre un obstacle, tout ou partie de l\u2019onde est r\u00e9fl\u00e9chie, avec une perte de puissance.
La r\u00e9flexion est telle que l\u2019angle d\u2019incidence est \u00e9gal \u00e0 l\u2019angle de r\u00e9flexion.<\/p>\n

Propri\u00e9t\u00e9s des milieux<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
MAT\u00c9RIAUX<\/th>\nAFFAIBLISSEMENT<\/th>\nEXEMPLES<\/th>\n<\/tr>\n<\/thead>\n
Air<\/td>\nAucun<\/td>\nEspace ouvert, cour int\u00e9rieure<\/td>\n<\/tr>\n
Bois<\/td>\nFaible<\/td>\nPorte, plancher, cloison<\/td>\n<\/tr>\n
Plastique<\/td>\nFaible<\/td>\nCloison<\/td>\n<\/tr>\n
Verre<\/td>\nFaible<\/td>\nVitres non teint\u00e9es<\/td>\n<\/tr>\n
Verre teint\u00e9<\/td>\nMoyen<\/td>\nVitres teint\u00e9es<\/td>\n<\/tr>\n
Eau<\/td>\nMoyen<\/td>\nAquarium, fontaine<\/td>\n<\/tr>\n
Etres vivants<\/td>\nMoyen<\/td>\nFoule, animaux, humains, v\u00e9g\u00e9tation<\/td>\n<\/tr>\n
Briques<\/td>\nMoyen<\/td>\nMurs<\/td>\n<\/tr>\n
Pl\u00e2tre<\/td>\nMoyen<\/td>\nCloisons<\/td>\n<\/tr>\n
C\u00e9ramique<\/td>\nElev\u00e9<\/td>\nCarrelage<\/td>\n<\/tr>\n
Papier<\/td>\nElev\u00e9<\/td>\nRouleaux de papier<\/td>\n<\/tr>\n
B\u00e9ton<\/td>\nElev\u00e9<\/td>\nMurs porteurs, \u00e9tages, piliers<\/td>\n<\/tr>\n
Verre blind\u00e9<\/td>\nElev\u00e9<\/td>\nVitres pare-balles<\/td>\n<\/tr>\n
M\u00e9tal<\/td>\nTr\u00e8s \u00e9lev\u00e9<\/td>\nB\u00e9ton arm\u00e9, miroirs, armoire m\u00e9tallique, cage d\u2019ascenseur<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Propagation des ondes radio Les ondes radio (not\u00e9es\u00a0RF pour\u00a0Radio Frequency) se propagent en ligne droite dans plusieurs directions. La vitesse<\/p>\n","protected":false},"author":6,"template":"","ht-faq-group":[1476],"class_list":["post-36041","ht_faq","type-ht_faq","status-publish","hentry"],"acf":[],"display_content":"

Propagation des ondes radio<\/strong><\/p>

Les ondes radio (not\u00e9es\u00a0RF pour\u00a0Radio Frequency) se propagent en ligne droite dans plusieurs directions. La vitesse de propagation des ondes dans le vide est de 3.108<\/span>\u00a0m\/s.
Dans tout autre milieu, le signal subit un affaiblissement d\u00fb \u00e0<\/p>

\u2013 la r\u00e9flexion
\u2013 la r\u00e9fraction
\u2013 la diffraction
\u2013 l\u2019absorption<\/p>

Absorption des ondes radio<\/strong><\/p>

Lorsqu\u2019une onde radio rencontre un obstacle, une partie de son \u00e9nergie est absorb\u00e9e et transform\u00e9e en \u00e9nergie, une partie continue \u00e0 se propager de fa\u00e7on att\u00e9nu\u00e9e et une partie peut \u00e9ventuellement \u00eatre r\u00e9fl\u00e9chie.<\/p>

R\u00e9flexion des ondes radio
Lorsqu\u2019une onde radio rencontre un obstacle, tout ou partie de l\u2019onde est r\u00e9fl\u00e9chie, avec une perte de puissance.
La r\u00e9flexion est telle que l\u2019angle d\u2019incidence est \u00e9gal \u00e0 l\u2019angle de r\u00e9flexion.<\/p>

Propri\u00e9t\u00e9s des milieux<\/strong><\/p>
MAT\u00c9RIAUX<\/th>AFFAIBLISSEMENT<\/th>EXEMPLES<\/th><\/tr><\/thead>
Air<\/td>Aucun<\/td>Espace ouvert, cour int\u00e9rieure<\/td><\/tr>
Bois<\/td>Faible<\/td>Porte, plancher, cloison<\/td><\/tr>
Plastique<\/td>Faible<\/td>Cloison<\/td><\/tr>
Verre<\/td>Faible<\/td>Vitres non teint\u00e9es<\/td><\/tr>
Verre teint\u00e9<\/td>Moyen<\/td>Vitres teint\u00e9es<\/td><\/tr>
Eau<\/td>Moyen<\/td>Aquarium, fontaine<\/td><\/tr>
Etres vivants<\/td>Moyen<\/td>Foule, animaux, humains, v\u00e9g\u00e9tation<\/td><\/tr>
Briques<\/td>Moyen<\/td>Murs<\/td><\/tr>
Pl\u00e2tre<\/td>Moyen<\/td>Cloisons<\/td><\/tr>
C\u00e9ramique<\/td>Elev\u00e9<\/td>Carrelage<\/td><\/tr>
Papier<\/td>Elev\u00e9<\/td>Rouleaux de papier<\/td><\/tr>
B\u00e9ton<\/td>Elev\u00e9<\/td>Murs porteurs, \u00e9tages, piliers<\/td><\/tr>
Verre blind\u00e9<\/td>Elev\u00e9<\/td>Vitres pare-balles<\/td><\/tr>
M\u00e9tal<\/td>Tr\u00e8s \u00e9lev\u00e9<\/td>B\u00e9ton arm\u00e9, miroirs, armoire m\u00e9tallique, cage d\u2019ascenseur<\/td><\/tr><\/tbody><\/table>","display_excerpt":"Propagation des ondes radio Les ondes radio (not\u00e9es\u00a0RF pour\u00a0Radio Frequency) se propagent en ligne droite dans plusieurs directions. 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