Resonance Loss
Benchmark energy storage efficiency ratios for inductors and resonant tank circuits measure the sharpness of electrical resonance against resistive dissipation in conductive layers and surrounding dielectric materials. Observing Q-factor degradation indicates a decline in quality factor caused by dielectric loss tangent increases or parasitic resistance. Lower quality factors broaden resonance peaks and increase signal attenuation in RF filter circuits.
High-frequency performance relies on maintaining low loss tangents across printed circuit board sub-assemblies.
Dissipation Mechanism
High-frequency currents concentrate along the outer skin of copper conductors due to skin effect, elevating effective AC resistance. Experiencing Q-factor degradation occurs when surface roughness on foil layers increases trace path length or when solder mask materials absorb environmental moisture. Thermal aging breaks down polymer chains within FR-4 or PTFE substrates, elevating the dielectric dissipation factor over operational time.
Parasitic capacitance between adjacent trace turns in planar inductors further degrades energy storage capability, dissipating RF energy as heat. Board fabrication parameters including copper foil treatment and laminate selection govern total dielectric dissipation.
Performance Impact
Reduced resonator selectivity impairs channel filtering in wireless transceivers. Measuring Q-factor degradation with vector network analyzers identifies assembly losses prior to final module integration. High-Q circuit design requires low-loss laminates and smooth copper profiles.
