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Radiation resistance, or , is proportional … Radiation resistance, or , is proportional to the part of an antenna's feedpoint electrical resistance that is caused by power loss from the emission of radio waves from the antenna. Radiation resistance is an effective resistance, due to the power carried away from the antenna as radio waves. Unlike conventional resistance or "Ohmic resistance", radiation resistance is not due to the opposition to current (resistivity) of the imperfect conducting materials the antenna is made of. The radiation resistance is conventionally defined as the value of loss resistance that would dissipate the same amount of power as heat, as is dissipated by the radio waves emitted from the antenna, when fed at a minimum-voltage / maximum-current point ("voltage node"). From Joule's law, it is equal to the total power radiated as radio waves by the antenna, divided by the square of the RMS current into the antenna terminals: The feedpoint and radiation resistances are determined by the geometry of the antenna, the operating frequency, and the antenna location (particularly with respect to the ground). The relation between the feedpoint resistance and the radiation resistance depends on the position on the antenna at which the feedline is attached.The relation between feedpoint resistance and radiation resistance is particularly simple when the feedpoint is placed (as ususal) at the antenna's minimum possible voltage / maximum possible current point; in that case, the total feedpoint resistance at the antenna's terminals is equal to the sum of the radiation resistance plus the loss resistance due to "Ohmic" losses in the antenna and the nearby soil: When the antenna is fed at some other point, the formula requires a correction factor .In a receiving antenna the radiation resistance represents the source resistance of the antenna, and the portion of the received radio power consumed by the radiation resistance represents radio waves re-radiated (scattered) by the antenna.es re-radiated (scattered) by the antenna.
, Der Strahlungswiderstand einer Antenne bes … Der Strahlungswiderstand einer Antenne beschreibt den Zusammenhang zwischen dem Antennenstrom I an den Anschlussklemmen der Antenne und der von der Antenne abgestrahlten Leistung . Er ist Folge der Strahlungsrückwirkung und wird im Rahmen der Elektrodynamik durch die Abraham-Lorentz-Gleichung beschrieben. In der Praxis stellt der Strahlungswiderstand eine Möglichkeit dar, die in der Elektrodynamik analytisch in vielen Fällen nur schwer zugängliche Feldkonfiguration einer Antenne auf die elektrischen Parameter am Speisepunkt der Antenne zurückzuführen. Mathematisch kann er ausgedrückt werden als: Zusammen mit den Verlustwiderstand der Antenne, welcher beispielsweise die ohmschen Widerstandsanteile der Antennendrähte umfasst, bildet er den Fußpunktwiderstand einer Antenne: Der Strahlungswiderstand ist frequenzabhängig und wird – ähnlich wie der Leitungswellenwiderstand eines Kabels – durch geometrische Form im Aufbau und durch die Umgebung im Nahfeld der Antenne bestimmt. Der Strahlungswiderstand ist materialunabhängig und ist immer geringer als der Fußpunktwiderstand der Antenne.er als der Fußpunktwiderstand der Antenne.
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| rdfs:comment |
Radiation resistance, or , is proportional … Radiation resistance, or , is proportional to the part of an antenna's feedpoint electrical resistance that is caused by power loss from the emission of radio waves from the antenna. Radiation resistance is an effective resistance, due to the power carried away from the antenna as radio waves. Unlike conventional resistance or "Ohmic resistance", radiation resistance is not due to the opposition to current (resistivity) of the imperfect conducting materials the antenna is made of. The radiation resistance is conventionally defined as the value of loss resistance that would dissipate the same amount of power as heat, as is dissipated by the radio waves emitted from the antenna, when fed at a minimum-voltage / maximum-current point ("voltage node"). From Joule's law, it is equal to the t"). From Joule's law, it is equal to the t
, Der Strahlungswiderstand einer Antenne bes … Der Strahlungswiderstand einer Antenne beschreibt den Zusammenhang zwischen dem Antennenstrom I an den Anschlussklemmen der Antenne und der von der Antenne abgestrahlten Leistung . Er ist Folge der Strahlungsrückwirkung und wird im Rahmen der Elektrodynamik durch die Abraham-Lorentz-Gleichung beschrieben. In der Praxis stellt der Strahlungswiderstand eine Möglichkeit dar, die in der Elektrodynamik analytisch in vielen Fällen nur schwer zugängliche Feldkonfiguration einer Antenne auf die elektrischen Parameter am Speisepunkt der Antenne zurückzuführen. Mathematisch kann er ausgedrückt werden als:thematisch kann er ausgedrückt werden als:
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| rdfs:label |
Strahlungswiderstand
, Radiation resistance
, Сопротивление излучения антенны
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