| 单词 | passive device |
| 释义 | passive device 1 An electronic component, such as a capacitor or resistor, that is incapable of amplification. 2 An artificial satellite that reflects an incoming signal without amplification. 3 A solar-power device that makes use of an existing structure to collect and utilize solar energy without the use of pumps, fans, etc. 4 A radar device that provides information for navigation, guidance, surveillance, etc., by receiving the microwave radiation. Such a passive device emits no microwave energy itself and therefore does not disclose its position. 5 A system that detects an object by the radiation that it emits, rather than by reflecting radiation off it, as in a passive infrared detector (PIR detector ). Compare active device. |
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