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An isotropic radiator is a theoretical point source of electromagnetic or sound waves which radiates the same intensity of radiation in all directions. It has no preferred direction of radiation. It radiates uniformly in all directions over a sphere centred on the source. Isotropic radiators are used as reference radiators with which other sources are compared, for example in determining the gain of antennas. A coherent isotropic radiator of electromagnetic waves is theoretically impossible, but incoherent radiators can be built. An isotropic sound radiator is possible because sound is a longitudinal wave.

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  • Isotropstrahler (de)
  • Isotropic radiator (en)
  • Antenna isotropa (it)
  • Antenne isotrope (fr)
  • 등방적 복사체 (ko)
  • Isotrope antenne (nl)
  • Antena izotropowa (pl)
  • Изотропный излучатель (ru)
rdfs:comment
  • 등방적 복사체(isotropic radiator)란 전자기파 또는 음파를 모든 방향으로 동일한 세기로 방출하는 이론적인 이다. 등방적 복사체는 특정한 복사 방향이 정해져있지 않으며 점원을 중심으로 한 구의 형상으로 모든 방향으로 균일하게 복사가 방사된다. 어떤 복사체가 등방적인지 여부는 을 따르는지 여부에 따라 결정된다. 예컨대 구형의 흑체는 등방적이며 또한 람베르티안하다. 납작평평한 흑체는 람베르티안하지만 등방적이지는 않다. 평평한 철판은 둘 다 아니다. 태양은 등방적이지만 주연감광에 의해 람베르티안은 아니다. (ko)
  • Een isotrope antenne is een ideale verliesvrije antenne. Ideaal wil zeggen dat de antenne in alle richtingen kan zenden of ontvangen. Het zendpatroon ziet er dus uit als een perfecte bol. Verliesvrij wil zeggen dat er in een signaal geen verliezen optreden bij het verzenden of ontvangen. Een isotrope antenne is een theoretische antenne. Het is fysisch niet mogelijk om deze antenne te realiseren. Het is echter wel een referentiepunt voor alle antennemodellen. (nl)
  • Изотро́пный излуча́тель — воображаемая (идеальная) антенна, излучающая во все направления электромагнитную энергию одинаковой интенсивности. Диаграмма направленности изотропного излучателя — круговая во всех сечениях, в частности, по векторам E и H. Изотропный излучатель излучает без потерь, то есть его КПД равен 100 %. (ru)
  • Ein Isotropstrahler (englisch isotropic antenna), auch Kugelstrahler oder isotrope Antenne genannt, ist ein Modell bzw. die hypothetische Idealisierung eines Punktstrahlers, der isotrop (d. h. gleichmäßig in alle Raumrichtungen) und verlustlos sendet bzw. empfängt. Er wird wegen der Einfachheit im Modell in der Antennentechnik als Referenz in Form einer „gedachten Bezugsantenne“ verwendet. Mit Ausnahme der Verlustlosigkeit und der gleichmäßigen Leistungsverteilung wird angenommen, dass alle anderen Eigenschaften des Isotropstrahlers identisch mit der realen Antenne sind, die beschrieben werden soll. (de)
  • An isotropic radiator is a theoretical point source of electromagnetic or sound waves which radiates the same intensity of radiation in all directions. It has no preferred direction of radiation. It radiates uniformly in all directions over a sphere centred on the source. Isotropic radiators are used as reference radiators with which other sources are compared, for example in determining the gain of antennas. A coherent isotropic radiator of electromagnetic waves is theoretically impossible, but incoherent radiators can be built. An isotropic sound radiator is possible because sound is a longitudinal wave. (en)
  • L’antenne isotrope est un modèle théorique servant de référence pour les calculs d'antennes de PIRE et de bilan de liaison. Dans un milieu homogène et isotrope, elle rayonnerait uniformément dans toutes les directions. Le diagramme de rayonnement de l'antenne isotrope est une sphère, son gain est égal à l'unité. Il est commun d'exprimer le gain d'une antenne quelconque en décibels par rapport à l'antenne isotrope (dBi). Par exemple le gain d'une antenne dipolaire (dipôle demi-onde) est égal à 2,15 dBi. Densité de puissance rayonnée pour un gain Ge : (fr)
  • L'antenna isotropa è l'astrazione concettuale di un'antenna che irradia potenza in tutte le direzioni in modo uniforme (ovvero isotropa), lavora su simmetria sferica. È spesso utilizzata come antenna di riferimento per gli studi teorici sull'elettromagnetismo. Se un radiatore è di tipo isotropo è indipendente dalla legge di Lambert. In teoria un'antenna isotropica è un'antenna ipotetica che irradia la stessa intensità delle onde radio in tutte le direzioni. Ha una direttività di 0 dBi (dB rispetto al isotropo). (it)
  • Antena izotropowa, antena wszechkierunkowa, promiennik izotropowy – teoretyczna antena o następujących cechach: * emituje sygnał równomiernie (izotropowo) we wszystkich kierunkach, * cały sygnał, którym zasilana jest antena, jest wysyłany bez strat i odbić, * ma zerowe wymiary fizyczne. Zysk energetyczny anteny izotropowej wynosi 0 dBi. Pojęcie anteny izotropowej jest stosowane przy określaniu EIRP i jest modelem teoretycznym, gdyż antena taka w rzeczywistości nie istnieje. Antena ta jest szczególnym przypadkiem anteny dookolnej: jej charakterystyka promieniowania jest idealnie sferyczna. (pl)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Isotropic_radiator_animation_240x240x8frame_0.4sec.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/PSM_V13_D058_Sound_waves_1.jpg
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