电子材料用(国外英文资料).docVIP

电子材料用(国外英文资料) attenuator A dual port device designed to make the output port less power than the input port. The power attenuator is a kind of energy loss of the RF / microwave components, devices containing internal resistive material. In addition to the usual fixed resistive attenuator, and electrically controlled quick adjusting attenuator. Attenuators are widely used in various situations where power levels need to be adjusted. A circuit used to introduce a predetermined attenuation in a specified frequency range. It is usually marked by the number of decibels introduced and the characteristic impedance of the ohms. Attenuators are widely used in CATV systems to meet the requirements of multi port to level. Such as the input of the amplifier, the control of the output level and the control of the branch attenuation. Attenuator has passive attenuator and active attenuator two kinds. The active attenuator is combined with other heat sensitive components to form a variable attenuator, which is used in an amplifier for automatic gain or slope control circuits. The passive attenuator has a fixed attenuator and an adjustable attenuator. Fixed attenuator is composed of resistors, does not affect the frequency characteristics, commonly used type T or type network; (commonly used with an impedance of 75 T and Pi of different attenuation resistance data for CATV system of a Book); adjustable attenuator by potentiometer used in debugging and level in the whole. The input and output impedance of the attenuator should match the interface, and the cable system should be 75 euro. The frequency characteristics of the attenuator meet the frequency range requirements of the system. In the frequency range, the attenuation of the attenuator should be independent of frequency. Therefore, commonly used resistance components. Different frequency range, attenuator form is different. As a useful coaxial attenuator; in waveguide system, commonly used for electric field energy absorption