Rated power of millimeter wave flexible cable (SWF-12)

FEP is used as the insulation material for the outer conductor of millimeter wave flexible cables. FEP is a heat-resistant sheath material, allowing for a margin in the rated power of the cable.
·Rated power at an ambient temperature of 25°C

 
·Rated power calculation model
The internal conductor, insulator, and external conductor of the flexible cable are treated as a single heat-generating body, and all losses due to RF signal attenuation are converted into heat. This heat is transferred by thermal conduction from the external conductor to the resin sheath surface and then dissipated into the air from the resin sheath surface. The temperature at which heat transfer and heat radiation from the sheath surface and heat generation inside the cable are in equilibrium is calculated. The power at which this equilibrium temperature equals the heat resistance temperature of the sheath material is defined as the rated power.
·Physical properties used in the calculation
Thermal conductivity of FEP material: 0.25 W/mK
Convective heat transfer coefficient for natural cooling: 5 W/m²K
Forced air cooling convective heat transfer coefficient: 25 W/m²K
Sheath surface emissivity: 0.9
Forced air cooling wind speed: 0.5 m/s
These values are general representative values and may vary significantly depending on the actual installation environment of the cable. When selecting a cable, please ensure sufficient margin.