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In a fairly wide range of frequency bands, a two-terminal network consisting of resistor elements is a constant with zero phase shift, constant attenuation and characteristic impedance independent of frequency. For the input terminal of the repeater, the input signal strength of the control repeater is within the normal range so as to avoid excessive input, resulting in congestion at the front of the repeater. At the same time, the repeater can work in a high gain state to obtain better noise figure performance. It can also be used as a front-end amplifier input.
Attenuators can be divided into two types: fixed and variable. In engineering, we often use fixed attenuators. At present, we have used 5dB, 10dB, 15dB, 20dB, 30dB, 40dB and so on. Attenuator The indicators we are most concerned with are attenuation size, power capacity, and so on. It should be noted that the input signal power is less than the attenuator's power capacity.
The load is a special attenuator with an infinite degree of attenuation. Terminals are components, components, or devices that receive electrical power on a circuit or appliance output port collectively referred to as a load.