{"id":5857,"date":"2026-01-26T01:40:12","date_gmt":"2026-01-26T09:40:12","guid":{"rendered":"https:\/\/www.tfngj.com\/?p=5857"},"modified":"2026-01-26T01:41:06","modified_gmt":"2026-01-26T09:41:06","slug":"working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves","status":"publish","type":"post","link":"https:\/\/www.tfngj.com\/pt\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/","title":{"rendered":"Princ\u00edpios de funcionamento das antenas: From Guided Waves to Free-Space Electromagnetic Waves (Das ondas guiadas \u00e0s ondas eletromagn\u00e9ticas no espa\u00e7o livre)"},"content":{"rendered":"

As antenas s\u00e3o os principais componentes dos modernos sistemas de comunica\u00e7\u00e3o sem fio, respons\u00e1veis por converter a energia das ondas guiadas em ondas eletromagn\u00e9ticas irradiadas para o espa\u00e7o livre e realizar o processo inverso de recep\u00e7\u00e3o. Sua opera\u00e7\u00e3o fundamental est\u00e1 na transforma\u00e7\u00e3o das formas de energia eletromagn\u00e9tica e na radia\u00e7\u00e3o espacial direcional. Este artigo explica sistematicamente os princ\u00edpios f\u00edsicos, os principais par\u00e2metros e as considera\u00e7\u00f5es de engenharia por tr\u00e1s dessa convers\u00e3o, sob a perspectiva de um engenheiro de comunica\u00e7\u00e3o de transmiss\u00e3o.<\/p>\n\n\n\n

\"Sistema<\/figure>\n\n\n

\n1. A base f\u00edsica da opera\u00e7\u00e3o da antena: Da linha de transmiss\u00e3o ao radiador<\/strong><\/strong>\n<\/h2>\n\n\n\n

Nos sistemas de comunica\u00e7\u00e3o, os sinais viajam ao longo das linhas de transmiss\u00e3o (como cabos coaxiais, linhas de microfita) na forma de ondas guiadas. A energia eletromagn\u00e9tica das ondas guiadas \u00e9 confinada dentro dos limites do condutor ou diel\u00e9trico, com campos el\u00e9tricos e magn\u00e9ticos perpendiculares entre si e \u00e0 dire\u00e7\u00e3o de propaga\u00e7\u00e3o. No entanto, as estruturas de linha de transmiss\u00e3o geralmente s\u00e3o ineficazes para a radia\u00e7\u00e3o eletromagn\u00e9tica porque o espa\u00e7amento entre seus condutores \u00e9 muito menor do que o comprimento de onda, fazendo com que a energia do campo permane\u00e7a em grande parte confinada nas proximidades.<\/p>\n\n\n\n

A principal fun\u00e7\u00e3o de uma antena \u00e9 romper esse confinamento. Quando uma estrutura de antena \u00e9 conectada a uma linha de transmiss\u00e3o e atende a crit\u00e9rios dimensionais espec\u00edficos (normalmente compar\u00e1veis ao comprimento de onda), as correntes alternadas de alta frequ\u00eancia s\u00e3o excitadas ao longo do condutor da antena. Os campos eletromagn\u00e9ticos que as acompanham podem ent\u00e3o se libertar das restri\u00e7\u00f5es do condutor, formando ondas eletromagn\u00e9ticas que se propagam livremente pelo espa\u00e7o. Esse processo est\u00e1 profundamente enraizado nas equa\u00e7\u00f5es de Maxwell, particularmente na Lei de Indu\u00e7\u00e3o de Faraday e na Lei de Ampere-Maxwell:<\/p>\n\n\n\n

\u2207\u00d7E=<\/strong> -<\/strong>\u2202B<\/strong>\/<\/strong>\u2202<\/strong>t<\/strong> <\/strong><\/strong><\/p>\n\n\n\n

\u2207\u00d7<\/strong>H<\/strong>=<\/strong> <\/strong>J<\/strong>+<\/strong> <\/strong>\u2202D<\/strong>\/<\/strong>\u2202t<\/strong><\/strong><\/p>\n\n\n\n

Essas equa\u00e7\u00f5es mostram que um campo el\u00e9trico vari\u00e1vel gera um campo magn\u00e9tico vari\u00e1vel, e vice-versa, criando oscila\u00e7\u00f5es eletromagn\u00e9ticas autossustent\u00e1veis que se propagam para fora [1].<\/p>\n\n\n

\n2. O processo de convers\u00e3o de chaves: Como as antenas atingem a radia\u00e7\u00e3o efetiva<\/strong><\/strong>\n<\/h2>\n\n\n

\n2.1 Correspond\u00eancia de imped\u00e2ncia: o limite para a transfer\u00eancia de energia<\/strong><\/strong>\n<\/h3>\n\n\n\n

A correspond\u00eancia de imped\u00e2ncia entre a antena e a linha de transmiss\u00e3o \u00e9 a principal condi\u00e7\u00e3o para a transfer\u00eancia eficiente de energia. Normalmente, as linhas de transmiss\u00e3o t\u00eam uma imped\u00e2ncia caracter\u00edstica fixa (por exemplo, 50\u03a9 ou 75\u03a9), enquanto a imped\u00e2ncia de entrada da antena \u00e9 uma fun\u00e7\u00e3o da frequ\u00eancia, que consiste em uma parte real (resist\u00eancia \u00e0 radia\u00e7\u00e3o R_r e resist\u00eancia \u00e0 perda R_l) e uma parte imagin\u00e1ria (reat\u00e2ncia X_a). A correspond\u00eancia ideal exige que a imped\u00e2ncia da antena seja o conjugado complexo da imped\u00e2ncia caracter\u00edstica da linha de transmiss\u00e3o. Nesse estado, a rela\u00e7\u00e3o de onda estacion\u00e1ria de tens\u00e3o (VSWR) se aproxima de 1:1, a reflex\u00e3o \u00e9 minimizada e a maior parte da energia \u00e9 transferida da linha para a antena. A incompatibilidade causa reflex\u00e3o de energia, reduzindo a efici\u00eancia da radia\u00e7\u00e3o e podendo danificar o transmissor. Os engenheiros geralmente usam um sintonizador de antena ou otimizam a estrutura da antena para obter uma correspond\u00eancia de banda larga [2].<\/p>\n\n\n

\n2.2 Distribui\u00e7\u00e3o de corrente e mecanismo de radia\u00e7\u00e3o<\/strong><\/strong>\n<\/h3>\n\n\n\n

A distribui\u00e7\u00e3o de corrente na antena determina diretamente suas caracter\u00edsticas de radia\u00e7\u00e3o. Tomando como exemplo a antena dipolo cl\u00e1ssica de meia onda, quando seu comprimento \u00e9 aproximadamente a metade do comprimento de onda operacional, a corrente no condutor segue uma distribui\u00e7\u00e3o aproximadamente senoidal - m\u00e1xima no centro (ponto de alimenta\u00e7\u00e3o) e zero nas extremidades. Essa corrente vari\u00e1vel no tempo excita campos eletromagn\u00e9ticos no espa\u00e7o circundante que se desprendem da estrutura da antena. De acordo com a teoria eletromagn\u00e9tica, as cargas aceleradas (correntes vari\u00e1veis no tempo) s\u00e3o a fonte de radia\u00e7\u00e3o. A intensidade do campo irradiado depende da magnitude da corrente, do comprimento efetivo da antena e da dire\u00e7\u00e3o da observa\u00e7\u00e3o.<\/p>\n\n\n

\n2.3 Forma\u00e7\u00e3o da radia\u00e7\u00e3o de campo distante<\/strong><\/strong>\n<\/h3>\n\n\n\n

A regi\u00e3o de campo ao redor de uma antena pode ser dividida em campo pr\u00f3ximo reativo, campo pr\u00f3ximo radiante e regi\u00e3o de campo distante (regi\u00e3o de Fraunhofer). Somente na regi\u00e3o de campo distante (a uma dist\u00e2ncia
r > 2D2<\/sup>\/As ondas eletromagn\u00e9ticas exibem caracter\u00edsticas de onda plana: os campos el\u00e9tricos e magn\u00e9ticos s\u00e3o mutuamente perpendiculares e est\u00e3o em fase, sua rela\u00e7\u00e3o \u00e9 igual \u00e0 imped\u00e2ncia de onda do espa\u00e7o livre (aproximadamente 377\u03a9) e elas se propagam radialmente. A densidade de pot\u00eancia (pot\u00eancia por unidade de \u00e1rea) no campo distante pode ser descrita pelo vetor de Poynting:<\/p>\n\n\n\n

S<\/strong> <\/strong>=1<\/strong>\/2 <\/strong>E<\/strong> <\/strong>\u00d7<\/strong> <\/strong>H\u2217<\/strong><\/strong><\/p>\n\n\n\n

Isso representa a forma final da energia lan\u00e7ada no espa\u00e7o livre pela antena [3].<\/p>\n\n\n

\n3. Par\u00e2metros essenciais de desempenho: A linguagem de projeto do engenheiro<\/strong><\/strong>\n<\/h2>\n\n\n

\n3.1 Diretividade e ganho<\/strong><\/strong>\n<\/h3>\n\n\n\n

O ganho da antena \u00e9 um par\u00e2metro central que mede sua capacidade de radia\u00e7\u00e3o direcional. Ele \u00e9 definido como a raz\u00e3o entre a intensidade de radia\u00e7\u00e3o na dire\u00e7\u00e3o de radia\u00e7\u00e3o m\u00e1xima da antena e a intensidade de radia\u00e7\u00e3o de um radiador isotr\u00f3pico ideal (omnidirecional), dada a mesma pot\u00eancia de entrada. Geralmente \u00e9 expresso em dBi. O ganho est\u00e1 intimamente relacionado \u00e0 diretividade da antena, mas incorpora a efici\u00eancia de radia\u00e7\u00e3o da pr\u00f3pria antena. As antenas de alto ganho concentram a energia de forma mais estreita em setores espec\u00edficos, ampliando assim o alcance da comunica\u00e7\u00e3o, o que \u00e9 fundamental para links de micro-ondas ponto a ponto ou comunica\u00e7\u00f5es via sat\u00e9lite.<\/p>\n\n\n

\n3.2 Padr\u00e3o de radia\u00e7\u00e3o e largura de feixe<\/strong><\/strong>\n<\/h3>\n\n\n\n

O padr\u00e3o de radia\u00e7\u00e3o da antena \u00e9 uma representa\u00e7\u00e3o gr\u00e1fica tridimensional que descreve a distribui\u00e7\u00e3o espacial de sua energia irradiada. Os engenheiros geralmente usam gr\u00e1ficos de se\u00e7\u00e3o transversal bidimensionais em dois planos principais (plano E e plano H). A largura de feixe de meia pot\u00eancia (HPBW) \u00e9 a largura angular entre os pontos do padr\u00e3o em que a pot\u00eancia irradiada cai para a metade de seu valor de pico. Ela reflete intuitivamente a concentra\u00e7\u00e3o do feixe da antena. O n\u00edvel do l\u00f3bulo lateral \u00e9 outra m\u00e9trica importante para suprimir a interfer\u00eancia e melhorar o desempenho do sistema [4].<\/p>\n\n\n

\n3.3 Largura de banda e polariza\u00e7\u00e3o<\/strong><\/strong>\n<\/h3>\n\n\n\n

A largura de banda operacional da antena refere-se \u00e0 faixa de frequ\u00eancia na qual seus principais par\u00e2metros de desempenho (como VSWR, ganho, padr\u00e3o) atendem \u00e0s especifica\u00e7\u00f5es. Os requisitos de largura de banda variam de acordo com a aplica\u00e7\u00e3o; as antenas de transmiss\u00e3o de TV podem exigir mais de 10% de largura de banda relativa, enquanto algumas antenas de comunica\u00e7\u00e3o via sat\u00e9lite podem exigir uma largura de banda muito estreita para suprimir a interfer\u00eancia.<\/p>\n\n\n\n

A polariza\u00e7\u00e3o da antena descreve a trajet\u00f3ria de orienta\u00e7\u00e3o espacial do vetor do campo el\u00e9trico radiante ao longo do tempo, sendo os tipos comuns a polariza\u00e7\u00e3o linear (vertical\/horizontal) e a circular. A correspond\u00eancia de polariza\u00e7\u00e3o entre as antenas transmissoras e receptoras \u00e9 outro fator fundamental para maximizar a transfer\u00eancia de energia; a perda de polariza\u00e7\u00e3o pode ser significativa em caso de incompatibilidade.<\/p>\n\n\n

\n4. Conclus\u00e3o: A antena - uma ponte que conecta sistemas fechados a um vasto espa\u00e7o<\/strong><\/strong>\n<\/h2>\n\n\n\n

Uma antena est\u00e1 longe de ser um simples condutor de metal; ela \u00e9 um transdutor eletromagn\u00e9tico preciso que permite a transforma\u00e7\u00e3o de formas de onda. Seu princ\u00edpio de funcionamento come\u00e7a com a excita\u00e7\u00e3o por ondas guiadas, passa pela correspond\u00eancia de imped\u00e2ncia da antena e pela excita\u00e7\u00e3o de corrente e culmina na radia\u00e7\u00e3o efetiva de ondas eletromagn\u00e9ticas no espa\u00e7o livre. O projeto de cada antena envolve uma delicada compensa\u00e7\u00e3o entre par\u00e2metros como resist\u00eancia \u00e0 radia\u00e7\u00e3o, diretividade, largura de banda e polariza\u00e7\u00e3o para um cen\u00e1rio de aplica\u00e7\u00e3o espec\u00edfico. Para os engenheiros de comunica\u00e7\u00e3o de transmiss\u00e3o, uma compreens\u00e3o profunda da cadeia completa, desde as ondas guiadas at\u00e9 as ondas de espa\u00e7o livre, \u00e9 fundamental para o projeto da antena, a integra\u00e7\u00e3o do sistema e a solu\u00e7\u00e3o de problemas complexos de interfer\u00eancia. Com o r\u00e1pido desenvolvimento do 5G, da IoT e da Internet via sat\u00e9lite, a demanda por tecnologia de antena integrada e de alto desempenho continuar\u00e1 a impulsionar o progresso nesse campo antigo, por\u00e9m vibrante.<\/p>","protected":false},"excerpt":{"rendered":"

Antennas are the core components of modern wireless communication systems, responsible for converting the energy of guided waves into electromagnetic waves radiated into free space, and performing the reverse reception process. Their fundamental operation lies in the transformation of electromagnetic energy forms and directional spatial radiation. This article systematically explains the physical principles, key parameters, […]<\/p>","protected":false},"author":1,"featured_media":2978,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-5857","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tfn-blog"],"yoast_head":"\nWorking Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves - Communication Test Expert<\/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.tfngj.com\/pt\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Working Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves - Communication Test Expert\" \/>\n<meta property=\"og:description\" content=\"Antennas are the core components of modern wireless communication systems, responsible for converting the energy of guided waves into electromagnetic waves radiated into free space, and performing the reverse reception process. Their fundamental operation lies in the transformation of electromagnetic energy forms and directional spatial radiation. This article systematically explains the physical principles, key parameters, […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tfngj.com\/pt\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/\" \/>\n<meta property=\"og:site_name\" content=\"Communication Test Expert\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-26T09:40:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-26T09:41:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"853\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\/\/www.tfngj.com\/#\/schema\/person\/985f00c1219ceea14a6db990da997b5d\"},\"headline\":\"Working Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves\",\"datePublished\":\"2026-01-26T09:40:12+00:00\",\"dateModified\":\"2026-01-26T09:41:06+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/\"},\"wordCount\":1066,\"publisher\":{\"@id\":\"https:\/\/www.tfngj.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg\",\"articleSection\":[\"Blogs\"],\"inLanguage\":\"pt-BR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/\",\"url\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/\",\"name\":\"Working Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves - Communication Test Expert\",\"isPartOf\":{\"@id\":\"https:\/\/www.tfngj.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg\",\"datePublished\":\"2026-01-26T09:40:12+00:00\",\"dateModified\":\"2026-01-26T09:41:06+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#breadcrumb\"},\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-BR\",\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage\",\"url\":\"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg\",\"contentUrl\":\"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg\",\"width\":1280,\"height\":853},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.tfngj.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Working Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.tfngj.com\/#website\",\"url\":\"https:\/\/www.tfngj.com\/\",\"name\":\"TFN-Communication Test Expert\",\"description\":\"Find Perfect Solutions in TFN\",\"publisher\":{\"@id\":\"https:\/\/www.tfngj.com\/#organization\"},\"alternateName\":\"TFN\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.tfngj.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"pt-BR\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.tfngj.com\/#organization\",\"name\":\"TFN\",\"url\":\"https:\/\/www.tfngj.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-BR\",\"@id\":\"https:\/\/www.tfngj.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/09\/\u9ed1logo.png\",\"contentUrl\":\"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/09\/\u9ed1logo.png\",\"width\":939,\"height\":232,\"caption\":\"TFN\"},\"image\":{\"@id\":\"https:\/\/www.tfngj.com\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.youtube.com\/@FateTFN\/search\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.tfngj.com\/#\/schema\/person\/985f00c1219ceea14a6db990da997b5d\",\"name\":\"admin\",\"sameAs\":[\"https:\/\/www.tfngj.com\"],\"url\":\"https:\/\/www.tfngj.com\/pt\/author\/admin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Princ\u00edpios de funcionamento das antenas: From Guided Waves to Free-Space Electromagnetic Waves (Das ondas guiadas \u00e0s ondas eletromagn\u00e9ticas no espa\u00e7o livre) - Especialista em testes de comunica\u00e7\u00e3o","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.tfngj.com\/pt\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/","og_locale":"pt_BR","og_type":"article","og_title":"Working Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves - Communication Test Expert","og_description":"Antennas are the core components of modern wireless communication systems, responsible for converting the energy of guided waves into electromagnetic waves radiated into free space, and performing the reverse reception process. Their fundamental operation lies in the transformation of electromagnetic energy forms and directional spatial radiation. This article systematically explains the physical principles, key parameters, […]","og_url":"https:\/\/www.tfngj.com\/pt\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/","og_site_name":"Communication Test Expert","article_published_time":"2026-01-26T09:40:12+00:00","article_modified_time":"2026-01-26T09:41:06+00:00","og_image":[{"width":1280,"height":853,"url":"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg","type":"image\/jpeg"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Escrito por":"admin","Est. tempo de leitura":"6 minutos"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#article","isPartOf":{"@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/"},"author":{"name":"admin","@id":"https:\/\/www.tfngj.com\/#\/schema\/person\/985f00c1219ceea14a6db990da997b5d"},"headline":"Working Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves","datePublished":"2026-01-26T09:40:12+00:00","dateModified":"2026-01-26T09:41:06+00:00","mainEntityOfPage":{"@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/"},"wordCount":1066,"publisher":{"@id":"https:\/\/www.tfngj.com\/#organization"},"image":{"@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage"},"thumbnailUrl":"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg","articleSection":["Blogs"],"inLanguage":"pt-BR"},{"@type":"WebPage","@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/","url":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/","name":"Princ\u00edpios de funcionamento das antenas: From Guided Waves to Free-Space Electromagnetic Waves (Das ondas guiadas \u00e0s ondas eletromagn\u00e9ticas no espa\u00e7o livre) - Especialista em testes de comunica\u00e7\u00e3o","isPartOf":{"@id":"https:\/\/www.tfngj.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage"},"image":{"@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage"},"thumbnailUrl":"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg","datePublished":"2026-01-26T09:40:12+00:00","dateModified":"2026-01-26T09:41:06+00:00","breadcrumb":{"@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#breadcrumb"},"inLanguage":"pt-BR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/"]}]},{"@type":"ImageObject","inLanguage":"pt-BR","@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#primaryimage","url":"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg","contentUrl":"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/10\/pexels-mati-17205903.jpg","width":1280,"height":853},{"@type":"BreadcrumbList","@id":"https:\/\/www.tfngj.com\/working-principles-of-antennas-from-guided-waves-to-free-space-electromagnetic-waves\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.tfngj.com\/"},{"@type":"ListItem","position":2,"name":"Working Principles of Antennas: From Guided Waves to Free-Space Electromagnetic Waves"}]},{"@type":"WebSite","@id":"https:\/\/www.tfngj.com\/#website","url":"https:\/\/www.tfngj.com\/","name":"TFN - Especialista em testes de comunica\u00e7\u00e3o","description":"Encontre solu\u00e7\u00f5es perfeitas no TFN","publisher":{"@id":"https:\/\/www.tfngj.com\/#organization"},"alternateName":"TFN","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.tfngj.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"pt-BR"},{"@type":"Organization","@id":"https:\/\/www.tfngj.com\/#organization","name":"TFN","url":"https:\/\/www.tfngj.com\/","logo":{"@type":"ImageObject","inLanguage":"pt-BR","@id":"https:\/\/www.tfngj.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/09\/\u9ed1logo.png","contentUrl":"https:\/\/www.tfngj.com\/wp-content\/uploads\/2025\/09\/\u9ed1logo.png","width":939,"height":232,"caption":"TFN"},"image":{"@id":"https:\/\/www.tfngj.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.youtube.com\/@FateTFN\/search"]},{"@type":"Person","@id":"https:\/\/www.tfngj.com\/#\/schema\/person\/985f00c1219ceea14a6db990da997b5d","name":"administrador","sameAs":["https:\/\/www.tfngj.com"],"url":"https:\/\/www.tfngj.com\/pt\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/posts\/5857","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/comments?post=5857"}],"version-history":[{"count":3,"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/posts\/5857\/revisions"}],"predecessor-version":[{"id":5861,"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/posts\/5857\/revisions\/5861"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/media\/2978"}],"wp:attachment":[{"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/media?parent=5857"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/categories?post=5857"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tfngj.com\/pt\/wp-json\/wp\/v2\/tags?post=5857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}