{"id":37250,"date":"2022-08-10T10:55:04","date_gmt":"2022-08-10T09:55:04","guid":{"rendered":"https:\/\/www.atim.com\/ht-faq\/new-faq-question-25\/"},"modified":"2022-08-10T14:12:23","modified_gmt":"2022-08-10T13:12:23","slug":"new-faq-question-25","status":"publish","type":"ht_faq","link":"https:\/\/www.atim.com\/en\/ht-faq\/new-faq-question-25\/","title":{"rendered":"How do radio waves travel through the air?"},"content":{"rendered":"

Propagation of radio waves<\/strong><\/p>\n

Radio waves (RF stands for Radio Frequency) propagate in straight lines in several directions. The propagation speed of waves in a vacuum is 3.108<\/span>\u00a0m\/s.<\/p>\n

In any other medium, the signal is weakened by
\u2013 reflection
\u2013 refraction
\u2013 diffraction
\u2013 absorption<\/p>\n

\u00a0<\/p>\n

Absorption of radio waves<\/strong><\/p>\n

When a radio wave encounters an obstacle, part of its energy is absorbed and transformed into energy, part continues to propagate in an attenuated manner and part may eventually be reflected.<\/p>\n

\u00a0<\/p>\n

Reflection of radio waves<\/strong><\/p>\n

When a radio wave encounters an obstacle, all or part of the wave is reflected, with a loss of power.<\/p>\n

The reflection is such that the angle of incidence is equal to the angle of reflection.<\/p>\n

\u00a0<\/p>\n

Properties of media<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
MATERIAL<\/th>\nATTENUATION<\/th>\nEXAMPLES<\/th>\n<\/tr>\n<\/thead>\n
Air<\/td>\nNone<\/td>\nOpen space, courtyard<\/td>\n<\/tr>\n
Wood<\/td>\nLow<\/td>\nDoor, floor, partition<\/td>\n<\/tr>\n
Plastic<\/td>\nLow<\/td>\nPartition<\/td>\n<\/tr>\n
Glass<\/td>\nLow<\/td>\nNon tinted glass<\/td>\n<\/tr>\n
Verre teint\u00e9<\/td>\nMedium<\/td>\nVitres teint\u00e9es<\/td>\n<\/tr>\n
Water<\/td>\nMedium<\/td>\nAquarium, fountain<\/td>\n<\/tr>\n
Living beings<\/td>\nMedium<\/td>\nCrowd, animals, humans, vegetation<\/td>\n<\/tr>\n
Bricks<\/td>\nMedium<\/td>\nWalls<\/td>\n<\/tr>\n
Plaster<\/td>\nMedium<\/td>\nPartitions<\/td>\n<\/tr>\n
Ceramic<\/td>\nHigh<\/td>\nTiles<\/td>\n<\/tr>\n
Paper<\/td>\nHigh<\/td>\nPaper rolls<\/td>\n<\/tr>\n
Concrete<\/td>\nHigh<\/td>\nLoad-bearing walls, floors, pillars<\/td>\n<\/tr>\n
Armoured glass<\/td>\nHigh<\/td>\nBulletproof glass<\/td>\n<\/tr>\n
Metal<\/td>\nVery high<\/td>\nReinforced concrete, mirrors, metal cabinet, lift shaft<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Propagation of radio waves Radio waves (RF stands for Radio Frequency) propagate in straight lines in several directions. The propagation<\/p>\n","protected":false},"author":19,"template":"","ht-faq-group":[1491],"class_list":["post-37250","ht_faq","type-ht_faq","status-publish","hentry"],"acf":[],"display_content":"

Propagation of radio waves<\/strong><\/p>

Radio waves (RF stands for Radio Frequency) propagate in straight lines in several directions. The propagation speed of waves in a vacuum is 3.108<\/span>\u00a0m\/s.<\/p>

In any other medium, the signal is weakened by
\u2013 reflection
\u2013 refraction
\u2013 diffraction
\u2013 absorption<\/p>

\u00a0<\/p>

Absorption of radio waves<\/strong><\/p>

When a radio wave encounters an obstacle, part of its energy is absorbed and transformed into energy, part continues to propagate in an attenuated manner and part may eventually be reflected.<\/p>

\u00a0<\/p>

Reflection of radio waves<\/strong><\/p>

When a radio wave encounters an obstacle, all or part of the wave is reflected, with a loss of power.<\/p>

The reflection is such that the angle of incidence is equal to the angle of reflection.<\/p>

\u00a0<\/p>

Properties of media<\/strong><\/p>
MATERIAL<\/th>ATTENUATION<\/th>EXAMPLES<\/th><\/tr><\/thead>
Air<\/td>None<\/td>Open space, courtyard<\/td><\/tr>
Wood<\/td>Low<\/td>Door, floor, partition<\/td><\/tr>
Plastic<\/td>Low<\/td>Partition<\/td><\/tr>
Glass<\/td>Low<\/td>Non tinted glass<\/td><\/tr>
Verre teint\u00e9<\/td>Medium<\/td>Vitres teint\u00e9es<\/td><\/tr>
Water<\/td>Medium<\/td>Aquarium, fountain<\/td><\/tr>
Living beings<\/td>Medium<\/td>Crowd, animals, humans, vegetation<\/td><\/tr>
Bricks<\/td>Medium<\/td>Walls<\/td><\/tr>
Plaster<\/td>Medium<\/td>Partitions<\/td><\/tr>
Ceramic<\/td>High<\/td>Tiles<\/td><\/tr>
Paper<\/td>High<\/td>Paper rolls<\/td><\/tr>
Concrete<\/td>High<\/td>Load-bearing walls, floors, pillars<\/td><\/tr>
Armoured glass<\/td>High<\/td>Bulletproof glass<\/td><\/tr>
Metal<\/td>Very high<\/td>Reinforced concrete, mirrors, metal cabinet, lift shaft<\/td><\/tr><\/tbody><\/table>","display_excerpt":"Propagation of radio waves Radio waves (RF stands for Radio Frequency) propagate in straight lines in several directions. The propagation","_ht_faq_order":"2","_ht_faq_enabled":"1","yoast_head":"\nHow do radio waves travel through the air? - ATIM<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.atim.com\/en\/ht-faq\/new-faq-question-25\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How do radio waves travel through the air? - ATIM\" \/>\n<meta property=\"og:description\" content=\"Propagation of radio waves Radio waves (RF stands for Radio Frequency) propagate in straight lines in several directions. 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