Overview
IEC TR 63307:2020 - "Measurement methods of the complex relative permeability and permittivity of noise suppression sheet" - is a Technical Report from the IEC that provides guidelines for measuring the frequency characteristics of complex relative permeability (μr) and complex permittivity (εr) of noise suppression sheets (NSS) used in electromagnetic noise countermeasures. The report covers measurement guidance across the 1 MHz to 6 GHz frequency range and documents practical measurement approaches, test sample preparation, test fixtures, and uncertainty considerations.
Key Topics
- Measurement scope and definitions: Terms, symbols and measurement objectives for permeability and permittivity of NSS.
- Multiple measurement methods: Detailed guidelines for a range of techniques, including:
- Inductance method (toroidal samples, lumped‑element approximation)
- Nicolson‑Ross‑Weir (NRW) method
- Short‑circuited microstrip line (MSL) method
- Short‑circuited coaxial line method
- Shielded loop coil method
- Harmonic resonance cavity perturbation method
- Test samples and fixtures: Recommendations for sample shapes (toroidal, rectangular), dimensions, and specific test jigs (MSL jig, coaxial jig, shielded loop).
- Measurement system and environment: Guidance on equipment arrangement, calibration, and test conditions to limit external influences.
- Data corrections and analysis: Treatment of demagnetization factors, permittivity corrections, DC bias effects, and methods to derive complex μr and εr from measured parameters.
- Uncertainty and accuracy: Considerations for measurement uncertainty, frequency-dependent accuracy and interpretation of results.
- Examples and annexes: Worked examples, equivalent circuit models, derivations and practical notes in informative annexes.
Applications
IEC TR 63307:2020 is practical for:
- Materials engineers characterizing magnetic and dielectric properties of EMI/EMC suppression sheets.
- R&D and test laboratories developing or validating noise suppression materials and components.
- EMC/EMI designers and product engineers selecting and qualifying NSS for enclosures, boards, or cable shielding.
- Manufacturers of absorptive/attenuative materials for quality control and product datasheets.
The standard supports accurate material selection, performance prediction across 1 MHz–6 GHz, and consistent reporting of complex μr and εr for electromagnetic noise countermeasure design.
Related standards
- Complements other IEC and CISPR guidance on electromagnetic compatibility and material measurement practices (see IEC catalogue for related EMC and materials standards).
Keywords: IEC TR 63307:2020, noise suppression sheet, complex relative permeability, permittivity, measurement methods, 1 MHz–6 GHz, inductance method, Nicolson‑Ross‑Weir, microstrip, coaxial, shielded loop, cavity perturbation, EMC testing.