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词汇 TV Aerial
分类 英语词汇 英语翻译词典
释义

TV Aerial

原声例句
Sophie's World A Novel About the History of Philosophy

Every day Dad shaves with a funny machine, sometimes he climbs onto the roof and turns the TV aerial—or else he sticks his head under the hood of the car and comes up black in the face.

爸爸每天都用一台有趣的机器刮胡子，有时他会爬到屋顶上转动电视天线——或者他把头伸到汽车引擎盖下， 结果脸都黑了。

中文百科

天线 Antenna (radio)

（重定向自TV Aerial）
接地型垂直天线（NHK甲府的中波送信所）
半波双极子天线辐射方向图（线性）
半波双极子天线（同上）增益（dBi）

天线是一种用来发射或接收无线电波——或更广泛来讲——电磁波的电子器件。天线应用于广播和电视、点对点无线电通信、雷达和太空探索等系统。天线通常在空气和外层空间中工作，也可以在水下运行，甚至在某些频率下工作于土壤和岩石之中。

从物理学上讲，天线是一个或多个导体的组合，由它可因施加的交变电压或交变电流而产生辐射的电磁场，或者可以将它放置在电磁场中，由于场的感应而在天线内部产生交变电流并在其终端产生交变电压。

英语百科

Antenna (radio) 天线

（重定向自TV Aerial）
Animation of a half-wave dipole antenna transmitting radio waves, showing the electric field lines. The antenna in the center is two vertical metal rods, with an alternating current applied at its center from a radio transmitter (not shown). The voltage charges the two sides of the antenna alternately positive (+) and negative (−). Loops of electric field (black lines) leave the antenna and travel away at the speed of light; these are the radio waves.
Animated diagram of a half-wave dipole antenna receiving energy from a radio wave. The antenna consists of two metal rods connected to a receiver R. The electric field (E, green arrows) of the incoming wave pushes the electrons in the rods back and forth, charging the ends alternately positive (+) and negative (−). Since the length of the antenna is one half the wavelength of the wave, the oscillating field induces standing waves of voltage (V, represented by red band) and current in the rods. The oscillating currents (black arrows) flow down the transmission line and through the receiver (represented by the resistance R).
Antennas of the Atacama Large Millimeter submillimeter Array.[11]

An antenna (plural antennae or antennas), or aerial, is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (i.e. a high frequency alternating current (AC)) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna inte****ts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
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