{"title":"Radiated Emissions Mechanisms and Modeling of Large-Capacity ±500 kV MMC-HVDC Systems","authors":"Qian Li;Keli Gao;Jie Liu;Yong Liu;Guifang Wu;Zhichao Yang;Yong Ju;Luxing Zhao","doi":"10.1109/TEMC.2026.3696457","DOIUrl":"10.1109/TEMC.2026.3696457","url":null,"abstract":"This article investigates the radiated emissions characteristics of large-scale ±500 kV modular multilevel converter-based high-voltage direct current (MMC-HVDC) systems in comparison with conventional line commutated converter-based high voltage direct current (LCC-HVDC) systems. The analysis reveals that the high switching frequency of IGBT devices, the massive number of submodules, and the commutations within each valve control period introduce complex disturbance sources that significantly affect high-frequency (HF) radiated electric field. To address these challenges, a wideband equivalent circuit model is developed from a multilevel perspective spanning \"submodule-valve group-system,\" capturing MHz-level disturbance sources and their conductive and radiative propagation paths. A corresponding radiated emissions simulation method is further proposed and validated, enabling accurate prediction of HF current components. Simulation results show that the switching superposition effect arising from submodule commutations is an important factor influencing MHz-level radiated emissions. The findings provide theoretical foundations and methodological support for electromagnetic compatibility design and radiated emissions mitigation in large-capacity MMC-HVDC projects.","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"68 5","pages":"1278-1290"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148384485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"IEEE Transactions on Electromagnetic Compatibility Information for Authors","authors":"","doi":"10.1109/TEMC.2026.3735491","DOIUrl":"https://doi.org/10.1109/TEMC.2026.3735491","url":null,"abstract":"","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"68 5","pages":"C3-C3"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11738419","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An Absorptive/Transmissive Frequency Selective Surface With Scattering Compensation-Enabled Broadband RCS Reduction for Ultra-Wideband Electromagnetic Shielding","authors":"Zijian Xing;Zhengming Lv;Zijie Zhao;Xiaoting Wang;Yuewen Gou;Ling Wang;Chow-Yen-Desmond Sim","doi":"10.1109/TEMC.2026.3712407","DOIUrl":"10.1109/TEMC.2026.3712407","url":null,"abstract":"This article proposes an electromagnetic (EM) shielding structure that exploits multistructure synergistic effects in a coding hybrid-mechanism metasurface. The hybrid metasurface can be utilized for broadband EM shielding, while simultaneously achieving bandpass EM wave transmission and radar cross section (RCS) reduction. A transmission-reflection integrated polarization conversion metasurface (PCM) unit is designed and arranged using 1-bit coding manner, achieving high diffuse reflection without wave absorption across portions from Ku to K band, thereby avoiding concentration of scattered energy at specific angles. This is further integrated with a broadband absorptive/transmissive frequency selective surface subsurface to form a broadband coding hybrid-mechanism metasurface with in-band wave transmission capability, realizing EM shielding in the S, C, X, Ku and K bands. To achieve RCS reduction within the transmission band, the in-band absorbing metasurface is loaded around conventional microstrip antenna and is overlaid with the proposed broadband coding hybrid-mechanism metasurface. The main innovations of this article lie in the integration strategy and the SA-APS algorithm, which enable the ATFSS and PCM functionalities to operate without mutual interference while simultaneously achieving bistatic RCS reduction. The proposed design successfully addresses the existing limitations of insufficient RCS reduction bandwidth while maintaining the radiation characteristics of the excitation source, and overcomes the inability to simultaneously reduce both monostatic and bistatic RCS. Specifically, it exhibits a continuous RCS reduction bandwidth ranging from 4.1to 22.2 GHz (137.6%), and within the frequency range of 6.4–13 GHz, both the simulated and measured SE reach over 16.1 dB. Experimental results validate that this heterogeneous hybrid metasurface comprising 1-bit coding PCM, ATFSS and in-band absorbers yields ultrawideband EM protection while maintaining stable band-pass unidirectional radiation, broadband RCS reduction and high SE, indicating significant potential for military EM spectrum warfare application.","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"68 5","pages":"1143-1155"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148755279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaoyu Wang;Xinsong Wang;Man Zhang;Xinyan Ma;Yifei Gao;Lei Wu;Guangzhi Chen;Donglin Su
{"title":"Securing UAVs Under Electromagnetic Interference: A CELR-Net Framework for Effect Mitigation and Experimental Verification","authors":"Xiaoyu Wang;Xinsong Wang;Man Zhang;Xinyan Ma;Yifei Gao;Lei Wu;Guangzhi Chen;Donglin Su","doi":"10.1109/TEMC.2026.3727322","DOIUrl":"10.1109/TEMC.2026.3727322","url":null,"abstract":"In unmanned aerial vehicle (UAV) systems, external electromagnetic interference (EMI) severely threatens flight safety by disrupting the normal operations of onboard devices. Through extensive UAV flight experiments under EMI, hardware-level disruptions in onboard devices are effectively reflected via distinct flight data anomalies, and two categories consisting of five types of EMI-induced anomalies are summarized to quantitatively characterize EMI effects at the data level. Experimental results indicate that EMI-induced anomalies exhibit coupled spatial–temporal characteristics across multiple flight parameters. To extract spatial correlations caused by the varying electromagnetic sensitivity of different onboard devices, the convolutional neural network and efficient channel attention are employed. To capture the complex temporal dependencies in flight data, long short-term memory is further incorporated. Meanwhile, a residual filtering technique is employed to suppress random noise in practical measurements. Combining spatial correlation extraction, temporal dependence capture, and noise suppression, a unified framework, termed the Convolutional-Efficient Channel Attention-Long Short-Term Memory-Residual Filtering Network (CELR-Net), is proposed for data-level EMI effect mitigation. To verify the performance of the proposed CELR-Net method, experiments are conducted on both simulated and real-world platforms, and the results demonstrate superior performance in accuracy compared to some commonly used methods. Ablation studies further validate the effectiveness and contribution of each component in the proposed network architecture.","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"68 5","pages":"1130-1142"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148922657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"IEEE Open Access Publishing","authors":"","doi":"10.1109/TEMC.2026.3735493","DOIUrl":"https://doi.org/10.1109/TEMC.2026.3735493","url":null,"abstract":"","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"68 5","pages":"1312-1312"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11738418","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jian Zheng;Liangshuai Lin;Cunxing Peng;Kaihui Zhao;Fang Liu
{"title":"Analytical Models of Common-Mode Voltage Under Discontinuous Pulse Width Modulation for Three-Phase Inverters","authors":"Jian Zheng;Liangshuai Lin;Cunxing Peng;Kaihui Zhao;Fang Liu","doi":"10.1109/TEMC.2026.3705447","DOIUrl":"10.1109/TEMC.2026.3705447","url":null,"abstract":"Discontinuous pulsewidth modulation (DPWM) is widely used in three-phase inverters with high power and high switching frequency. With the improvement of inverter performance requirements, the electromagnetic interference caused by common-mode voltages (CMVs) generated by DPWM cannot be ignored. To predict and suppress the common-mode electromagnetic interference, it is necessary to establish frequency-domain analytical models of CMV. By applying the double Fourier series theory, the analytical models of CMVs for DPWM0, DPWM1, and DPWMmax are established. The calculated spectra of CMVs are acquired from the analytical models. By analyzing and comparing the analytical models and calculated spectra, the characteristic patterns of CMVs are obtained, and based on this, some ideas for suppressing CMVs are given. Simulations and experiments are carried out in an inverter-driven motor system, and the simulated spectra and experimental spectra of CMVs are consistent with the calculated spectra, which verifies the correctness and validity of the analytical models. The method of establishing analytical models is compared and discussed with the method of conventional simulation-experiment for CMVs, which highlights the benefits of the analytical models.","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"68 5","pages":"1291-1302"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148415055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Shielding Effectiveness Improvement of a Conducting Slab via Layering: Effects of Layer Count and Gap Thickness","authors":"Xinyi Jiang;Hanyu Wu;Herui Cheng;Chongqing Jiao","doi":"10.1109/TEMC.2026.3712811","DOIUrl":"10.1109/TEMC.2026.3712811","url":null,"abstract":"Prior studies have revealed that a double shield achieves higher shielding effectiveness (SE) than a single shield of the same total conductor thickness. This letter generalizes this framework to an arbitrary number of layers, examining SE improvement by partitioning a single conducting slab into equally thick subsheets interleaved with uniform air gaps. We show that when the product of the total thickness (sheets plus gaps) and the slab thickness exceeds the skin depth squared, increasing either the layer count or the total thickness significantly enhances SE. As layers are added, SE initially rises, then declines, and finally stabilizes at the homogenized limit. In addition, half-wavelength resonant effects can cause SE dips at certain higher frequencies, but these can be eliminated by further increasing the layer count.","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"68 5","pages":"1303-1306"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148586775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Approximate Expressions for Ground-Return Impedance and Admittance of Overhead Lines Including Magnetic Earth Effects","authors":"Xin Nie, Ming Li, Venkata Dinavahi","doi":"10.1109/temc.2026.3732548","DOIUrl":"https://doi.org/10.1109/temc.2026.3732548","url":null,"abstract":"","PeriodicalId":55012,"journal":{"name":"IEEE Transactions on Electromagnetic Compatibility","volume":"21 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}