Passive radiator

（重定向自Passive element）

In a radio antenna, a passive radiator or parasitic element is a conductive element, typically a metal rod, which is not electrically connected to anything else. Multielement antennas such as the Yagi-Uda antenna typically consist of a "driven element" which is connected to the radio receiver or transmitter through a feed line, and parasitic elements, which are not. The purpose of the parasitic elements is to modify the radiation pattern of the radio waves emitted by the driven element, directing them in a beam in one direction, increasing the antenna's directivity (gain). A parasitic element does this by acting as a passive resonator, something like a guitar's sound box, absorbing the radio waves from the nearby driven element and re-radiating them again with a different phase. The waves from the different antenna elements interfere, strengthening the antenna's radiation in the desired direction, and cancelling out the waves in undesired directions.

单词	Passive element
释义	Passive element 原声例句老子的人生智慧 Because of this, we generally lack respect for the passive element of life. 正因为如此，我们普遍缺乏对生命中被动元素的尊重。老子的人生智慧 Yin consists of the more passive elements, like silence, receptiveness, not reacting as opposed to reacting, and also softness, and flexibility. 阴由更被动的元素组成，如沉默、接受、与回应相对的不回应，还有柔和和灵活性。老子的人生智慧 It also implies that there's a 'doer' who engages in 'doing something', and that there's a passive element or 'the thing that's being done'. 这也意味着有一个“实干家”专注于“做事”，还有一个被动因素或“正在被做的事情”。英语百科 Passive radiator （重定向自Passive element） In a radio antenna, a passive radiator or parasitic element is a conductive element, typically a metal rod, which is not electrically connected to anything else. Multielement antennas such as the Yagi-Uda antenna typically consist of a "driven element" which is connected to the radio receiver or transmitter through a feed line, and parasitic elements, which are not. The purpose of the parasitic elements is to modify the radiation pattern of the radio waves emitted by the driven element, directing them in a beam in one direction, increasing the antenna's directivity (gain). A parasitic element does this by acting as a passive resonator, something like a guitar's sound box, absorbing the radio waves from the nearby driven element and re-radiating them again with a different phase. The waves from the different antenna elements interfere, strengthening the antenna's radiation in the desired direction, and cancelling out the waves in undesired directions.
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