1. Frequency response: refers to the frequency bandwidth, generally expressed in megahertz (MHz) or gigahertz (GHz). A universal attenuator typically has a bandwidth of around 5GHz, with a maximum of 50GHz.

　　2. Attenuation range and structural form:

　　The attenuation range refers to the attenuation ratio, which generally ranges from 3dB, 10dB, 14dB, 20dB, and can reach up to 110dB. The attenuation formula is 10lg (output/input), for example: 10dB represents: output: input=attenuation multiple=10 times.

　　There are generally two types of structural forms: fixed proportional attenuators and stepwise proportional adjustable attenuators. A fixed attenuator refers to an attenuator with a fixed ratio multiple within a certain frequency range. Step by step attenuators are attenuators with adjustable proportional multiples at fixed intervals (e.g. 1dB), and are further divided into manual step by step attenuators and programmable step by step attenuators.

　　3. Connection head form and connection size:

　　The connector forms are divided into BNC type, N type, TNC type, SMA type, SMC type, etc., and the connector shapes have two types: male and female.

　　4. Attenuation index:

　　There are multiple requirements for attenuation indicators, mainly including attenuation accuracy, withstand power, characteristic impedance, reliability, repeatability, etc.

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