什么是衰减器（Attenuator）？

Attenuator Basics
An Attenuator is a special type of electrical or electronic bidirectional circuit made up of entirely resistive elements. An attenuator is a two port resistive network designed to weaken or "attenuate" (hence their name)
the power being supplied by a source to a level that is suitable for the connected load. The
attenuator

reduces the amount of power being delivered to the connected load by either a single fixed amount, a
variable amount or in a series of known switchable steps. Attenuators are generally used in radio,
communication and transmission line applications to weaken a stronger signal.
The attenuator is a purely passive resistive network (hence no supply) which is used in a wide variety of
electronic equipment for extending the dynamic range of measuring equipment by adjusting signal levels, to
provide impedance matching of oscillators or amplifiers to reduce the effects of improper input/output
terminations, or to simply provide isolation between different circuit stages depending upon their application
as shown.