SIST EN IEC 61788-15:2026

Overview

SIST EN IEC 61788-15:2026 is an international standard developed under the IEC 61788 series for superconductivity. This document specifies precise methods for measuring the intrinsic surface impedance (Zs) of high-temperature superconductor (HTS) films at microwave frequencies. Utilizing a modified two-resonance mode dielectric resonator method, the standard facilitates detailed electronic characteristic measurements to obtain the temperature dependence of Zs at the resonant frequency (f0). The methodology applies to HTS films with thicknesses greater than 50 nm and frequencies up to 40 GHz, delivering high measurement resolution.

Designed for professionals in superconductivity, microwave engineering, and electronic materials, SIST EN IEC 61788-15:2026 provides recognized techniques for comparing the microwave properties of superconductor films and ensuring uniform measurement practices globally.

Key Topics

• High-Temperature Superconductor (HTS) Films: Focuses on YBCO and similar materials with low microwave losses, widely used in advanced electronic and telecommunication devices.
• Intrinsic Surface Impedance (Zs): Defines the measurement of resistance and reactance at film surfaces, crucial for evaluating microwave performance in superconducting materials.
• Dielectric Resonator Method: Employs a modified two-resonance technique, enabling accurate, non-invasive impedance measurement at cryogenic and varied temperatures.
• Measurement Conditions:
  • Applicable frequency range: up to 40 GHz
  • Minimum film thickness: 50 nm
  • Measurement resolution: 0.01 mΩ at 10 GHz
• Temperature Dependence: Acquires temperature-dependent Zs values, allowing comprehensive analysis of superconductor films' electronic properties.
• Data Reporting: Emphasizes standardized comparison by reporting Zs at both measured frequencies and those scaled to 10 GHz, using frequency rules for surface resistance (f²) and reactance (f).
• Updated Terminology and Uncertainty: Replaces “precision and accuracy” with “uncertainty” and introduces systematic guidelines for evaluating combined relative standard uncertainty.
• Round Robin Test Results: Incorporates multi-institution data intercomparisons to validate the robustness and repeatability of the methodologies.

Applications

SIST EN IEC 61788-15:2026 is essential for multiple sectors requiring reliable microwave characterization of superconducting materials:

• Research and Development: Used by research laboratories and universities to advance superconductor technology and study intrinsic material properties.
• Quality Assurance in Manufacturing: Ensures consistency in the performance of HTS films used in the production of microwave filters, antennas, resonators, and other RF devices.
• Telecommunication and Sensing: Applied in the testing and qualification of thin films for telecom infrastructure, radar systems, satellite communications, and high-sensitivity microwave sensors.
• Material Comparison and Benchmarking: Enables manufacturers and developers to accurately benchmark HTS films from different sources, supporting material selection and process optimization.
• Standardization and Compliance: Facilitates harmonization of electronic characteristic measurements across international markets, aiding compliance with global industry standards.

Related Standards

For comprehensive understanding and implementation, the following standards are closely related to SIST EN IEC 61788-15:2026:

• IEC 60050-815:2024 - International Electrotechnical Vocabulary, Part 815: Superconductivity. Provides standard definitions used throughout superconductivity standards.
• IEC 61788-7 – Superconductivity – Surface resistance measurements at microwave frequencies. Earlier standard for surface resistance using alternative techniques.
• Other IEC 61788 Series – Covers various tests and properties for superconductors, such as critical current and other electronic characteristics.

Adhering to SIST EN IEC 61788-15:2026 fosters trust in measurement results and underpins innovation in superconductivity, microwave electronics, and advanced signal applications worldwide. This standard is an invaluable reference for laboratories, manufacturers, and certification bodies dedicated to high-precision microwave measurements of superconductor films.