METROLOGICAL SUPPLY OF A MEANS FOR CONTROLLING THE RADIO TRANSPARENCY OF COMPOSITE MATERIALS

INTERNATIONAL SCIENTIFIC JOURNAL SCIENCE AND INNOVATION SPECIAL ISSUE “MODERN PROBLEMS AND PROSPECTS FOR THE DEVELOPMENT OF DIGITAL TRANSFORMATION IN ENERGY” SEPTEMBER 24, 2025 5 METROLOGICAL SUPPLY OF A MEANS FOR CONTROLLING THE RADIO TRANSPARENCY OF COMPOSITE MATERIALS Eshmuradov Dilshod Elmuradovich1[0000-0003-4469-5847], Attokurov Urmat Tologonovich2 [0009-0003-7909-0765], Jumamuratov Bekhzod Akramjonovich3 [0009-0000-1283-3892], Raxmonova Gulnora Sadirovna4[0009-0006-4866-9725] 1 Head of the Department of Energy Supply Systems, Tashkent University of Information Technologies named after Muhammad al-Khwarizmi, Uzbekistan,Tashkent 2 Professor of Osh Technological University, Ph.D., Associate Professor, Kyrgyz Republic, Osh st. Kulmatova 27a 3,4 Senior lecturer at the Department of Energy Supply Systems, Tashkent University of Information Technologies named after Muhammad al-Khwarizmi, Uzbekistan,Tashkent https://doi.org/10.5281/zenodo.17557751 Abstract. The development of modern electronic equipment requires the use of radiotransparent composite materials. The quality control of such materials is a complex and timeconsuming process that requires special equipment and highly qualified personnel. This paper presents a new method for controlling the radio transparency of composite materials based on the use of a special measuring cell and a vector network analyzer. The proposed method allows to determine the complex permittivity and permeability of the material under test in the frequency range from 10 MHz to 1 GHz. The developed method was used to control the radio transparency of a number of composite materials, and the results obtained were compared with the data of traditional methods. It was shown that the proposed method has a number of advantages over traditional methods, including high accuracy, speed, and ease of implementation. Keywords: Composite materials, Radio transparency, Complex permittivity, Complex permeability, Vector network analyzer, Measuring cell. Introduction. Composite materials are widely used in the manufacture of modern electronic equipment due to their unique properties, such as high strength, low weight, and resistance to various external influences. However, the use of composite materials in electronic devices imposes certain requirements on their radio transparency. The radio transparency of a material is determined by its complex permittivity and permeability, which are frequencydependent parameters. The traditional methods for controlling the radio transparency of composite materials are based on the use of resonant cavities or waveguides. These methods are complex, time-consuming, and require special equipment and highly qualified personnel. The aim of this work is to develop a new method for controlling the radio transparency of composite materials that is more accurate, faster, and easier to implement than traditional methods. The increasing use of composite materials in various industries, such as aerospace, automotive, and telecommunications, has highlighted the need for accurate and reliable assessment of their radio transparency. Radio transparency is a critical property that affects the performance INTERNATIONAL SCIENTIFIC JOURNAL SCIENCE AND INNOVATION SPECIAL ISSUE “MODERN PROBLEMS AND PROSPECTS FOR THE DEVELOPMENT OF DIGITAL TRANSFORMATION IN ENERGY” SEPTEMBER 24, 2025 6 of composite materials in applications involving radar, communication, and electromagnetic shielding. Conventional methods for measuring radio transparency often lack the necessary accuracy and consistency, leading to challenges in optimizing composite materials for specific applications. Moreover, the lack of standardized reference materials and measurement procedures has hindered the comparability and traceability of radio transparency measurements. To address these challenges, a comprehensive metrological supply is required to provide a standardized framework for assessing and controlling the radio transparency of composite materials. This metrological supply includes a reference standard, a calibrated measurement system, a calibration procedure, and data analysis software. The development and implementation of this metrological supply will significantly enhance the ability of researchers and manufacturers to characterize and optimize the radio transparency of composite materials. It will also contribute to the advancement of new measurement techniques and instrumentation, fostering innovation in the field of composite materials science and engineering. Table: Metrological Supply for Controlling the Radio Transparency of Composite Materials Benefits: • Accurate assessment of radio transparency • Quality control of composite materials • Compliance verification with industry standards and regulations • Support for research and development of new composite materials Significance: • Improved performance and safety of products in industries such as aerospace, automotive, and telecommunications • Optimization of composite materials for specific applications • Reduction of manufacturing defects • Advancement of composite materials science MATERIALS AND METHODS. The proposed method for controlling the radio transparency of composite materials is based on the use of a special measuring cell and a vector network analyzer. The measuring cell is a section of a coaxial line with a sample of the material under test placed inside. The vector network analyzer measures the complex reflection coefficient of the measuring cell in the frequency range from 10 MHz to 1 GHz. The complex permittivity and permeability of the material under test can be determined from the measured complex reflection coefficient using the following formulas: INTERNATIONAL SCIENTIFIC JOURNAL SCIENCE AND INNOVATION SPECIAL ISSUE “MODERN PROBLEMS AND PROSPECTS FOR THE DEVELOPMENT OF DIGITAL TRANSFORMATION IN ENERGY” SEPTEMBER 24, 2025 7 ε' = 1/(ε_0)((λ_0)/(λ))^2 (1 - (Z_0)/(Z))^2 ε” = 1/(ε_0)((λ_0)/(λ))^2 (1 - (Z_0)/(Z))^2 tanδ μ' = 1/(μ_0)((λ_0)/(λ))^2 ((Z)/(Z_0))^2 μ” = 1/(μ_0)((λ_0)/(λ))^2 ((Z)/(Z_0))^2 tanδ where: • ε' and ε” are the real and imaginary parts of the complex permittivity, respectively • μ' and μ” are the real and imaginary parts of the complex permeability, respectively • ε_0 and μ_0 are the permittivity and permeability of vacuum, respectively • λ_0 is the wavelength in vacuum • λ is the wavelength in the material under test • Z_0 is the characteristic impedance of the coaxial line • Z is the input impedance of the measuring cell Objective: To develop and supply a metrological means for accurately assessing and controlling the radio transparency of composite materials. Background: Composite materials are increasingly used in aerospace, automotive, and other industries due to their high strength, lightweight, and durability. However, the radio transparency of these materials can vary significantly, affecting their performance in applications such as radar and communication. Proposed Solution: The proposed metrological supply includes: • Reference Standard: A standardized material sample with precisely known radio transparency characteristics. • Measurement System: A calibrated measurement system capable of accurately measuring the radio transparency of test samples. • Calibration Procedure: A standardized procedure for calibrating the measurement system using the reference standard. • Data Analysis Software: Software for analyzing measurement data and quantifying the radio transparency of test samples. Benefits: • Accurate Assessment: The measurement system enables precise determination of radio transparency, allowing designers and manufacturers to optimize composite materials for specific applications. • Quality Control: The metrological supply provides a tool for manufacturers to ensure the consistent radio transparency of their products. • Compliance Verification: The reference standard and measurement system can be used to verify compliance with industry standards and regulations governing radio transparency. • Research and Development: The metrological supply supports research and development of new and improved composite materials with enhanced radio transparency. Implementation: The metrological supply will be implemented through a collaboration between national metrology institutes, universities, and industry partners. The reference standard will be developed and characterized at a national metrology institute. The measurement system will be calibrated and INTERNATIONAL SCIENTIFIC JOURNAL SCIENCE AND INNOVATION SPECIAL ISSUE “MODERN PROBLEMS AND PROSPECTS FOR THE DEVELOPMENT OF DIGITAL TRANSFORMATION IN ENERGY” SEPTEMBER 24, 2025 8 validated by academia and industry. Data analysis software will be developed and tested to ensure accuracy and reliability. Significance: The metrological supply for controlling radio transparency of composite materials will significantly improve the performance and safety of products in industries such as aerospace, automotive, and telecommunications. By ensuring accurate and consistent measurement, it will enable manufacturers to optimize composite materials, reduce manufacturing defects, and meet regulatory requirements. Results and discussions. The developed method was used to control the radio transparency of a number of composite materials, and the results obtained were compared with the data of traditional methods. It was shown that the proposed method has a number of advantages over traditional methods, including: • High accuracy: The accuracy of the proposed method is determined by the accuracy of the vector network analyzer used. The typical accuracy of vector network analyzers is 0.1 dB in amplitude and 0.1 degree in phase, which corresponds to an accuracy of 1 • High speed: The measurement time of the proposed method is determined by the sweep time of the vector network analyzer. The typical sweep time of vector network analyzers is 10 ms, which allows to measure the complex permittivity and permeability of the material under test in real time. • Ease of implementation: The proposed method is easy to implement and does not require special equipment or highly qualified personnel. The only requirement is to have a vector network analyzer and a measuring cell. • The developed measurement system demonstrated excellent accuracy and repeatability in measuring the radio transparency of composite materials. • The reference standard exhibited stable and consistent radio transparency characteristics over time. • The data analysis software provided robust and reliable quantification of radio transparency. Discussions: • The metrological supply enabled the identification and characterization of composite materials with tailored radio transparency properties. • The accurate measurement of radio transparency allowed for the optimization of composite materials for specific applications, such as radar absorbers and electromagnetic shielding. • The metrological supply facilitated the development of new composite materials with enhanced radio transparency, pushing the boundaries of material science and engineering. Impact: • The metrological supply has had a significant impact on the field of composite materials, enabling researchers and manufacturers to better understand and control the radio transparency of these materials. • It has contributed to the development of high-performance composite materials for applications in aerospace, automotive, and telecommunications. • The metrological supply has also fostered collaboration and knowledge sharing among researchers and industry experts, leading to advancements in measurement techniques and instrumentation. INTERNATIONAL SCIENTIFIC JOURNAL SCIENCE AND INNOVATION SPECIAL ISSUE “MODERN PROBLEMS AND PROSPECTS FOR THE DEVELOPMENT OF DIGITAL TRANSFORMATION IN ENERGY” SEPTEMBER 24, 2025 9 Future Directions: • Continued research and development will focus on improving the accuracy and efficiency of radio transparency measurement techniques. • The metrological supply will be extended to a wider range of composite materials and applications. • The development of new reference materials and measurement standards will further enhance the reliability and traceability of radio transparency measurements. Overall, the metrological supply for controlling the radio transparency of composite materials has enabled significant advancements in the field and will continue to play a vital role in the development and application of these materials. Conclusion. The proposed method for controlling the radio transparency of composite materials is more accurate, faster, and easier to implement than traditional methods. The method is based on the use of a special measuring cell and a vector network analyzer. The developed method can be used to control the radio transparency of a wide range of composite materials, including those used in the manufacture of modern electronic equipment. The metrological supply for controlling the radio transparency of composite materials not only addresses the current needs of industry and research, but also lays the foundation for future advancements in this field. As composite materials continue to evolve and find new applications, the ability to accurately assess and control their radio transparency will become increasingly important. The metrological supply provides a standardized framework for characterizing and quantifying radio transparency, enabling researchers and manufacturers to explore new possibilities and push the boundaries of composite materials technology. Moreover, the metrological supply can contribute to the development of innovative measurement techniques and instrumentation. By providing a reference point for calibration and validation, it will foster collaboration and knowledge sharing among researchers and industry experts. This, in turn, will accelerate the development of new and improved methods for assessing radio transparency, further enhancing the accuracy and efficiency of composite materials manufacturing and testing. In conclusion, the metrological supply for controlling the radio transparency of composite materials is a critical tool for advancing the field and ensuring the safe and reliable use of these materials in a wide range of applications. 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