Characterization of RF Micro-Coaxial Cable Insertion Loss Degradation
RF micro-coaxial insertion loss escalates through skin-depth resistance, dielectric loss tangent shifts, mechanical flex displacement, and atmospheric oxidation.
S21 Attenuation
Meaning
Transmission metrics describe the reduction in power as a signal travels from an input port to an output port. The s21 attenuation measures the insertion loss of a cable or a filter. It represents the efficiency of the signal path.
A higher decibel value in this context usually means more energy is being lost during transit.
Path Loss
Energy is absorbed by the dielectric material or dissipated as heat through the resistance of the metal. As the frequency of the signal increases, the s21 attenuation typically gets worse due to the skin effect and molecular friction. Longer cables show more loss than shorter ones of the same construction.
Heat Dissipation
The power that vanishes from the signal does not disappear but turns into thermal energy. In high power base stations, s21 attenuation contributes to the heat load that the cooling system must manage. Excessive loss can lead to the melting of plastic components or the shifting of electrical properties.
Throughput Efficiency
Low loss is essential for maintaining the signal to noise ratio at the receiver end. If the s21 attenuation is too high, the data rate of a wireless link will drop to compensate for the weak signal. Engineers choose silver plating or low loss dielectrics to keep this value as low as possible for critical data paths and sensitive telemetry.
Consistent monitoring of this parameter during production ensures that the final assembly meets the thermal and signal requirements of the system.