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http://dbpedia.org/ontology/abstract Die Fortpflanzungskonstante, manchmal auchDie Fortpflanzungskonstante, manchmal auch Ausbreitungskonstante, Ausbreitungskoeffizient oder Ausbreitungsmaß genannt, ist eine Größe, welche die Ausbreitung einer Welle (z. B. einer elektromagnetischen Welle in der Leitungstheorie und der Elektrodynamik) beschreibt. Sie hängt von den Eigenschaften des Mediums ab, in dem sich die Welle ausbreitet. Bei sinusförmigen Signalen und der Anwendung der komplexen Wechselstromrechnung ist sie eine komplexe Größe und kann in Real- und Imaginärteil zerlegt werden ( sei die imaginäre Einheit): Der Realteil der Fortpflanzungskonstante heißt Dämpfungskonstante, der Imaginärteil Phasenkonstante. Sie bestimmen die Dämpfung bzw. die Phasendrehung der Welle und sind im Allgemeinen frequenzabhängig. Als alternative Beschreibungsgröße (besonders bei Funk- und Schallwellen) verwendet man oft die komplexe Wellenzahl :erwendet man oft die komplexe Wellenzahl : , La costante di propagazione in elettromagnLa costante di propagazione in elettromagnetismo rappresenta il modo in cui l'onda elettromagnetica di un segnale sinusoidale trasmesso su una linea di trasmissione si attenua e sfasa lungo di essa. È una quantità complessa data da: dove la parte reale è la costante di attenuazione, la parte immaginaria è la ed è l'unita immaginaria. Nel caso di linea di trasmissione senza perdite: dove è il numero d'onda angolare. La costante di attenuazione indica dunque l'indebolimento in cui esso incorre attraversando un qualsiasi mezzo che può essere sia un cavo o un altro tipo di resistenza. Dipende dal logaritmo naturale del rapporto fra i moduli della tensione d'ingresso e di uscita e rispetta la seguente formula matematica: dove si può riconoscere in la tensione del generatore o d'ingresso e in la tensione sul carico o di uscita. A frequenze elevate la costante di propagazione viene utilizzata nelle equazioni dei telefonisti per calcolare il comportamento del segnale che si propaga nel carico.nto del segnale che si propaga nel carico. , Konstanta šíření patří mezi . Označujeme jKonstanta šíření patří mezi . Označujeme ji . Konstantu šíření můžeme vypočítat dle vztahu: kde: , je podélná impedance vedení na jednotku délky a, je příčná admitance na jednotku délky. Konstanta šíření je komplexní číslo a můžeme ji rozepsat do tvaru: kdereálná část α představuje a imaginární část β představujeředstavuje a imaginární část β představuje , The propagation constant of a sinusoidal eThe propagation constant of a sinusoidal electromagnetic wave is a measure of the change undergone by the amplitude and phase of the wave as it propagates in a given direction. The quantity being measured can be the voltage, the current in a circuit, or a field vector such as electric field strength or flux density. The propagation constant itself measures the change per unit length, but it is otherwise dimensionless. In the context of two-port networks and their cascades, propagation constant measures the change undergone by the source quantity as it propagates from one port to the next. The propagation constant's value is expressed logarithmically, almost universally to the base e, rather than the more usual base 10 that is used in telecommunications in other situations. The quantity measured, such as voltage, is expressed as a sinusoidal phasor. The phase of the sinusoid varies with distance which results in the propagation constant being a complex number, the imaginary part being caused by the phase change.ary part being caused by the phase change. , ثابت الانتشار للموجة الكهرومغناطيسية الجيبثابت الانتشار للموجة الكهرومغناطيسية الجيبية مقياس للتغير في سعة الموجة وطورها عند انتشارها في اتجاه معين. ويجوز أن تكون الكمية المقيسة الجهد أو التيار في الدارة أو متجها مجاليا مثل شدة المجال الكهربائي. ويقيس ثابت الانتشار التغير لكل وحدة طول، لكنه بخلافه يكون بلا أبعاد. لكل وحدة طول، لكنه بخلافه يكون بلا أبعاد. , A constante de propagação, em eletrônica eA constante de propagação, em eletrônica e telecomunicações pode ter diversas conotações. Para um transdutor elétrico, esta é o logarítmo natural da relação entre a corrente elétrica que entra no transdutor e a corrente que sai, quando o transdutor termina por suas impedâncias interativas. Numa linha de transmissão uniforme, a constante de propagação por unidade de comprimento é o logarítmo natural da relação entre a corrente que passa num ponto da linha e a corrente passante num segundo ponto, tomado este na direção da transmissão ao longo da linha, quando esta tem um comprimento arbitrado infinito (muito grande) ou termina por uma impedância característica. A constante de propagação por seção de uma linha periódica é o logarítmo natural da relação entre a corrente que entra na seção e a corrente que sai quando a linha periódica tem comprimento infinito, ou termina por sua impedância característica. A parte real da constante de propagação é a constante de atenuação e a parte imaginária é a constante de fase ou . No caso de transmissão de som através de qualquer meio físico, esta é o logarítmo natural da relação entre a velocidade de volume da onda sonora na entrada do recipiente ou local que contém o meio de propagação e a velocidade de saída do mesmo recipiente ou local. A constante de propagação em um meio pode ser descrita pela seguinte equação: onde é a frequência da onda eletromagnética, é a permeabilidade do meio, é a permissividade do meio, é a constante de atenuação, a constante de fase, e a unidade imaginária. A constante de atenuação e de fase podem ser facilmente obtidas a partir da manipulação da equação acima, assim se obtêm estes parâmetros em função das constantes do meio: Em Linhas de Transmissão a constante de propagação pode ser expressa na forma: onde é a frequência da onda eletromagnética, R é a resistência série da linha, L é a indutância série da linha, G é a condutância paralela da linha e C é a capacitância paralela da linha.ha e C é a capacitância paralela da linha.
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rdfs:comment Konstanta šíření patří mezi . Označujeme jKonstanta šíření patří mezi . Označujeme ji . Konstantu šíření můžeme vypočítat dle vztahu: kde: , je podélná impedance vedení na jednotku délky a, je příčná admitance na jednotku délky. Konstanta šíření je komplexní číslo a můžeme ji rozepsat do tvaru: kdereálná část α představuje a imaginární část β představujeředstavuje a imaginární část β představuje , Die Fortpflanzungskonstante, manchmal auchDie Fortpflanzungskonstante, manchmal auch Ausbreitungskonstante, Ausbreitungskoeffizient oder Ausbreitungsmaß genannt, ist eine Größe, welche die Ausbreitung einer Welle (z. B. einer elektromagnetischen Welle in der Leitungstheorie und der Elektrodynamik) beschreibt. Sie hängt von den Eigenschaften des Mediums ab, in dem sich die Welle ausbreitet. Bei sinusförmigen Signalen und der Anwendung der komplexen Wechselstromrechnung ist sie eine komplexe Größe und kann in Real- und Imaginärteil zerlegt werden ( sei die imaginäre Einheit):rlegt werden ( sei die imaginäre Einheit): , The propagation constant of a sinusoidal eThe propagation constant of a sinusoidal electromagnetic wave is a measure of the change undergone by the amplitude and phase of the wave as it propagates in a given direction. The quantity being measured can be the voltage, the current in a circuit, or a field vector such as electric field strength or flux density. The propagation constant itself measures the change per unit length, but it is otherwise dimensionless. In the context of two-port networks and their cascades, propagation constant measures the change undergone by the source quantity as it propagates from one port to the next.s it propagates from one port to the next. , La costante di propagazione in elettromagnLa costante di propagazione in elettromagnetismo rappresenta il modo in cui l'onda elettromagnetica di un segnale sinusoidale trasmesso su una linea di trasmissione si attenua e sfasa lungo di essa. È una quantità complessa data da: dove la parte reale è la costante di attenuazione, la parte immaginaria è la ed è l'unita immaginaria. Nel caso di linea di trasmissione senza perdite: dove è il numero d'onda angolare.perdite: dove è il numero d'onda angolare. , ثابت الانتشار للموجة الكهرومغناطيسية الجيبثابت الانتشار للموجة الكهرومغناطيسية الجيبية مقياس للتغير في سعة الموجة وطورها عند انتشارها في اتجاه معين. ويجوز أن تكون الكمية المقيسة الجهد أو التيار في الدارة أو متجها مجاليا مثل شدة المجال الكهربائي. ويقيس ثابت الانتشار التغير لكل وحدة طول، لكنه بخلافه يكون بلا أبعاد. لكل وحدة طول، لكنه بخلافه يكون بلا أبعاد. , A constante de propagação, em eletrônica eA constante de propagação, em eletrônica e telecomunicações pode ter diversas conotações. Para um transdutor elétrico, esta é o logarítmo natural da relação entre a corrente elétrica que entra no transdutor e a corrente que sai, quando o transdutor termina por suas impedâncias interativas. A constante de propagação por seção de uma linha periódica é o logarítmo natural da relação entre a corrente que entra na seção e a corrente que sai quando a linha periódica tem comprimento infinito, ou termina por sua impedância característica.termina por sua impedância característica.
rdfs:label ثابت الانتشار , Constante de propagação , Propagation constant , Costante di propagazione , Konstanta šíření , Fortpflanzungskonstante
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