Attenuation

Attenuation is a measure of the amount of attenuation per unit length of coaxial cable when RF signals are transmitted through it, expressed in dB/m (decibels per meter). RF signals transmitted through coaxial cable attenuate with distance.
Attenuation increases as frequency increases. This is because higher frequency signals require more energy to transmit.
A similar metric to attenuation is insertion loss. Insertion loss is a metric that represents the attenuation of RF signals when a cable is inserted, including attenuation at connection points such as connectors and terminals.
While attenuation is a metric that represents the characteristics of the cable itself, insertion loss is a metric that represents the total loss, including not only the cable but also the connection points.
Attenuation varies depending on the material and structure of the cable. For example, thicker cables or cables made of materials with lower dielectric constants have lower attenuation. Considering these points, select a coaxial cable that suits your intended use and environmental conditions.