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.
Minimum Bend Radius
Meaning
Geometric constraints define the smallest arc a cable or flexible circuit can safely form without damaging its internal structure. The minimum bend radius specifies a limit beyond which the materials suffer permanent deformation or electrical failure. It is usually expressed as a multiple of the cable diameter.
Staying above this value ensures that the conductors do not stretch and the dielectric does not crush. If this limit is exceeded during installation, the signal integrity of the transmission line is no longer guaranteed.
Structural Limit
Bending a cable too tightly puts the outer layers under tension while the inner layers buckle. If the minimum bend radius is ignored, the shielding may open up and allow electromagnetic interference to leak. In fiber optic systems, excessive bending leads to light escaping the core which causes signal loss.
Installation Compliance
Routing through conduits and around corners depends on this value for successful deployment. A tight minimum bend radius allows for smaller enclosures and more compact device designs. If a path is too narrow, the installation must use a more flexible cable type or a different routing strategy.
Long-term Reliability
Repeated stress even above the failure point can cause the insulation to crack over several years. Adhering to the minimum bend radius during the design phase prevents the slow degradation of the jacket material. This practice is especially important in environments where temperature swings make the plastic more brittle.