The basic material that constitutes a coaxial attenuator is a resistive material. The typical resistance is a basic form of coaxial attenuator, and the resulting resistance attenuator network is a lumped parameter attenuator. By using certain techniques to place resistive materials into RF/microwave circuit structures in different frequency bands, attenuators with corresponding frequencies are formed. If it is a high-power attenuator, the volume will definitely increase, and the key is the heat dissipation design. With the development of modern electronic technology, rapid adjustment attenuators are needed in many situations. There are usually two implementation methods for this type of attenuator. One is a semiconductor low-power fast tuning attenuator, such as a PIN transistor or FET single-chip integrated attenuator; The second is the resistance attenuation network controlled by switches, which can be electronic switches or RF relays.

　　The main uses of coaxial attenuators

　　1. Control power level: Control the output power of the local oscillator in a microwave superheterodyne receiver to obtain the optimal noise coefficient and frequency conversion loss, and achieve the best receiving effect. In microwave receivers, achieve automatic gain control to improve dynamic range.

　　2. Decoupling element: As a decoupling element between the oscillator and the load.

　　3. Relative standard: As a relative standard for comparing power levels.

　　4. Jump attenuator used in radar anti-interference: It is a variable attenuator with a sudden change in attenuation amount. It does not introduce attenuation in normal times and suddenly increases attenuation when encountering external interference.

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