{"title":"孔径、孔隙随机性和孔隙率对聚氨酯泡沫材料电磁干扰屏蔽性能的影响","authors":"Ahmad Mamoun Khamis, Isabelle Huynen","doi":"10.1002/jnm.70111","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>This paper presents a novel approach to analyze the electromagnetic interference (EMI) shielding effectiveness (SE) of polyurethane (PU) foam geometries, which are built in Blender software and simulated using CST Studio software. Three different batches of geometries were built to investigate the impact of pore diameters, pore randomness, and void fraction of PU foam on the SE, reflection coefficient (<i>S</i><sub>11</sub>), and electromagnetic absorption in the 26.5–40 GHz frequency range. The observed resonance frequency decreased with decreasing pore diameters and void fraction. Decreasing the pore diameter, increasing the pore randomness, and decreasing the void fraction enhanced the SE in the frequency range between the resonance frequency and 40 GHz. The EM absorption increased with increasing the pore diameter and randomness but decreased with increasing the void fraction. This study also presents simulations and measurements of Polytetrafluoroethylene (PTFE) and PU foam materials. The simulation results were compared with the measured ones obtained using vector network analyzer measurements to verify CST Studio's ability to accurately calculate the EM parameters. The measured and simulated results were in good agreement, confirming the accuracy of the results obtained using CST Studio. Our new parametric study fills a gap in existing literature since it combines for the first time an open-source 3D software for 3D rendering with an electromagnetic simulator to evaluate the impact of the pore topography (void fraction, diameter, randomness, etc.) on the EMI shielding performance of PU foams.</p>\n </div>","PeriodicalId":50300,"journal":{"name":"International Journal of Numerical Modelling-Electronic Networks Devices and Fields","volume":"38 5","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Impact of Pore Diameters, Pore Randomness, and Void Fraction on the EMI Shielding of Polyurethane Foams\",\"authors\":\"Ahmad Mamoun Khamis, Isabelle Huynen\",\"doi\":\"10.1002/jnm.70111\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n <p>This paper presents a novel approach to analyze the electromagnetic interference (EMI) shielding effectiveness (SE) of polyurethane (PU) foam geometries, which are built in Blender software and simulated using CST Studio software. Three different batches of geometries were built to investigate the impact of pore diameters, pore randomness, and void fraction of PU foam on the SE, reflection coefficient (<i>S</i><sub>11</sub>), and electromagnetic absorption in the 26.5–40 GHz frequency range. The observed resonance frequency decreased with decreasing pore diameters and void fraction. Decreasing the pore diameter, increasing the pore randomness, and decreasing the void fraction enhanced the SE in the frequency range between the resonance frequency and 40 GHz. The EM absorption increased with increasing the pore diameter and randomness but decreased with increasing the void fraction. This study also presents simulations and measurements of Polytetrafluoroethylene (PTFE) and PU foam materials. The simulation results were compared with the measured ones obtained using vector network analyzer measurements to verify CST Studio's ability to accurately calculate the EM parameters. The measured and simulated results were in good agreement, confirming the accuracy of the results obtained using CST Studio. Our new parametric study fills a gap in existing literature since it combines for the first time an open-source 3D software for 3D rendering with an electromagnetic simulator to evaluate the impact of the pore topography (void fraction, diameter, randomness, etc.) on the EMI shielding performance of PU foams.</p>\\n </div>\",\"PeriodicalId\":50300,\"journal\":{\"name\":\"International Journal of Numerical Modelling-Electronic Networks Devices and Fields\",\"volume\":\"38 5\",\"pages\":\"\"},\"PeriodicalIF\":1.7000,\"publicationDate\":\"2025-09-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Numerical Modelling-Electronic Networks Devices and Fields\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/jnm.70111\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Numerical Modelling-Electronic Networks Devices and Fields","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/jnm.70111","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
The Impact of Pore Diameters, Pore Randomness, and Void Fraction on the EMI Shielding of Polyurethane Foams
This paper presents a novel approach to analyze the electromagnetic interference (EMI) shielding effectiveness (SE) of polyurethane (PU) foam geometries, which are built in Blender software and simulated using CST Studio software. Three different batches of geometries were built to investigate the impact of pore diameters, pore randomness, and void fraction of PU foam on the SE, reflection coefficient (S11), and electromagnetic absorption in the 26.5–40 GHz frequency range. The observed resonance frequency decreased with decreasing pore diameters and void fraction. Decreasing the pore diameter, increasing the pore randomness, and decreasing the void fraction enhanced the SE in the frequency range between the resonance frequency and 40 GHz. The EM absorption increased with increasing the pore diameter and randomness but decreased with increasing the void fraction. This study also presents simulations and measurements of Polytetrafluoroethylene (PTFE) and PU foam materials. The simulation results were compared with the measured ones obtained using vector network analyzer measurements to verify CST Studio's ability to accurately calculate the EM parameters. The measured and simulated results were in good agreement, confirming the accuracy of the results obtained using CST Studio. Our new parametric study fills a gap in existing literature since it combines for the first time an open-source 3D software for 3D rendering with an electromagnetic simulator to evaluate the impact of the pore topography (void fraction, diameter, randomness, etc.) on the EMI shielding performance of PU foams.
期刊介绍：
Prediction through modelling forms the basis of engineering design. The computational power at the fingertips of the professional engineer is increasing enormously and techniques for computer simulation are changing rapidly. Engineers need models which relate to their design area and which are adaptable to new design concepts. They also need efficient and friendly ways of presenting, viewing and transmitting the data associated with their models.
The International Journal of Numerical Modelling: Electronic Networks, Devices and Fields provides a communication vehicle for numerical modelling methods and data preparation methods associated with electrical and electronic circuits and fields. It concentrates on numerical modelling rather than abstract numerical mathematics.
Contributions on numerical modelling will cover the entire subject of electrical and electronic engineering. They will range from electrical distribution networks to integrated circuits on VLSI design, and from static electric and magnetic fields through microwaves to optical design. They will also include the use of electrical networks as a modelling medium.
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