{"id":73089,"date":"2026-09-04T08:31:40","date_gmt":"2026-09-04T06:31:40","guid":{"rendered":"https:\/\/www.km77.com\/revista\/?p=73089"},"modified":"2026-09-04T08:31:42","modified_gmt":"2026-09-04T06:31:42","slug":"coches-dos-aletas-techo-motivo","status":"publish","type":"post","link":"https:\/\/www.km77.com\/revista\/engendro-mecanico\/coches-dos-aletas-techo-motivo\/","title":{"rendered":"Por qu\u00e9 algunos coches llevan dos aletas en el techo"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La cl\u00e1sica antena de varilla met\u00e1lica desenroscable comenz\u00f3 a desaparecer de los techos a principios de los a\u00f1os 2000, cuando marcas como BMW generalizaron la cubierta pl\u00e1stica aerodin\u00e1mica conocida como <strong>\u00abaleta de tibur\u00f3n\u00bb<\/strong>. Dise\u00f1ada para alojar en un espacio compacto las bandas de radio AM\/FM, el receptor satelital del navegador (GPS\/GLONASS) y el m\u00f3dulo telef\u00f3nico b\u00e1sico (GSM), esta soluci\u00f3n redujo el riesgo de vandalismo y los problemas de ruido aerodin\u00e1mico o da\u00f1os en los t\u00faneles de lavado.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sin embargo, en las gamas m\u00e1s recientes de fabricantes de gran volumen y modelos de alta gama, los conductores han comenzado a ver la presencia de\u00a0<strong>dos aletas id\u00e9nticas o asim\u00e9tricas<\/strong>\u00a0montadas en paralelo sobre el tramo final del techo. Esta configuraci\u00f3n puede responder a la necesidad de separar f\u00edsicamente distintas antenas y sistemas de comunicaci\u00f3n, aunque la funci\u00f3n concreta de cada aleta depende del veh\u00edculo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Saturaci\u00f3n del espectro radioel\u00e9ctrico<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un turismo moderno ya no es \u00fanicamente un receptor pasivo de radio y se\u00f1ales de posicionamiento, ya que es un nodo de telecomunicaciones complejo y bidireccional que intercambia informaci\u00f3n en tiempo real.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La integraci\u00f3n de numerosos sistemas de comunicaci\u00f3n obliga a dise\u00f1ar cuidadosamente la posici\u00f3n y el aislamiento entre las distintas antenas para evitar acoplamientos y degradaci\u00f3n de sus prestaciones:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Conectividad 4G y 5G con matrices MIMO:<\/strong>\u00a0<strong>Conectividad 4G y 5G con matrices MIMO:<\/strong> Para aumentar la capacidad y mejorar la robustez de la conexi\u00f3n, los sistemas celulares emplean varias antenas. Su disposici\u00f3n y separaci\u00f3n se dise\u00f1an para limitar el acoplamiento entre ellas y mantener unas prestaciones adecuadas.<\/li>\n\n\n\n<li><strong>Comunicaciones V2X (veh\u00edculo con el entorno):<\/strong>&nbsp;La integraci\u00f3n de protocolos&nbsp;<em>Vehicle-to-Vehicle<\/em>&nbsp;(V2V) y&nbsp;<em>Vehicle-to-Infrastructure<\/em>&nbsp;(V2I) demanda canales dedicados de baj\u00edsima latencia para intercambiar datos de seguridad vial con la infraestructura circundante.<\/li>\n\n\n\n<li><strong>Servicios telem\u00e1ticos y llamada de emergencia obligatoria (eCall):<\/strong>\u00a0Requieren sus propias capacidades de comunicaci\u00f3n m\u00f3vil y posicionamiento, que pueden compartir o utilizar antenas espec\u00edficas seg\u00fan la arquitectura del veh\u00edculo.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/09\/full-1-1024x683.jpg\" alt=\"\" class=\"wp-image-73092\" srcset=\"https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/09\/full-1-1024x683.jpg 1024w, https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/09\/full-1-980x653.jpg 980w, https:\/\/www.km77.com\/revista\/wp-content\/uploads\/2026\/09\/full-1-480x320.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><figcaption class=\"wp-element-caption\">Imagen de km77<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Separar las antenas en distintas zonas del techo facilita el aislamiento electromagn\u00e9tico y permite optimizar su posici\u00f3n para obtener una cobertura adecuada.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Retrovisores digitales por c\u00e1mara y techos panor\u00e1micos de cristal<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Adem\u00e1s de la propia saturaci\u00f3n electromagn\u00e9tica, hay otros usos que se les da a estas aletas:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>C\u00e1maras para el retrovisor interior digital:<\/strong>\u00a0En algunos veh\u00edculos con retrovisor interior mediante c\u00e1mara, una de estas carcasas puede integrar la c\u00e1mara trasera. Situarla en una posici\u00f3n elevada permite obtener una visi\u00f3n m\u00e1s amplia y mantenerla alejada de determinadas zonas de turbulencia, suciedad o salpicaduras.<\/li>\n\n\n\n<li><strong>La arquitectura del techo panor\u00e1mico:<\/strong>\u00a0Los techos solares completos de vidrio impiden el uso de la propia chapa met\u00e1lica de la carrocer\u00eda y pueden condicionar la ubicaci\u00f3n de determinadas antenas. Al quedar la superficie \u00fatil de chapa reducida a dos estrechas tiras met\u00e1licas o a los pilares laterales traseros, los ingenieros deciden desdoblar las funciones en dos aletas perimetrales para no invadir el mecanismo del cristal practicable ni el guarnecido del techo interior.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">De este modo, lo que a simple vista podr\u00eda parecer una duplicidad innecesaria es, en realidad, la respuesta t\u00e9cnica obligada a la creciente densidad de datos que gestiona el autom\u00f3vil conectado contempor\u00e1neo.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La cl\u00e1sica antena de varilla met\u00e1lica desenroscable comenz\u00f3 a desaparecer de los techos a principios de los a\u00f1os 2000, cuando marcas como BMW generalizaron la cubierta pl\u00e1stica aerodin\u00e1mica conocida como \u00abaleta de tibur\u00f3n\u00bb. Dise\u00f1ada para alojar en un espacio compacto las bandas de radio AM\/FM, el receptor satelital del navegador (GPS\/GLONASS) y el m\u00f3dulo telef\u00f3nico [&hellip;]<\/p>\n","protected":false},"author":93,"featured_media":73093,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[3912],"tags":[7975,22],"class_list":["post-73089","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engendro-mecanico","tag-de-todo-un-poco","tag-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Por qu\u00e9 algunos coches llevan dos aletas en el techo<\/title>\n<meta name=\"description\" content=\"Explicamos la funci\u00f3n t\u00e9cnica de la doble antena de aleta de tibur\u00f3n en el techo del coche: conectividad 5G, redundancia de datos, retrovisores digitales y dise\u00f1o aerodin\u00e1mico.\" \/>\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.km77.com\/revista\/engendro-mecanico\/coches-dos-aletas-techo-motivo\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Por qu\u00e9 algunos coches llevan dos aletas en el techo\" \/>\n<meta property=\"og:description\" content=\"Explicamos la funci\u00f3n t\u00e9cnica de la doble antena de aleta de tibur\u00f3n en el techo del coche: conectividad 5G, redundancia de datos, retrovisores digitales y dise\u00f1o aerodin\u00e1mico.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.km77.com\/revista\/engendro-mecanico\/coches-dos-aletas-techo-motivo\/\" \/>\n<meta property=\"og:site_name\" content=\"Revista km77\" \/>\n<meta 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