en 5-Electromagnetics Electromagnetics Research Paper Research Paper <span style="font-size:10.0pt"><span style="line-height:107%"><span new="" roman="" style="font-family:" times="">This paper proposes a structure for concrete composite materials that effectively attenuates transmitted power through the composite slab across a wide frequency range. The proposed structure is practical for electromagnetic interference shielding applications. To assess its effectiveness, the proposed structure has been compared with two other structures: a traditional wire mesh used in reinforced composites and an array of helices, a cutting-edge technique for manufacturing lightweight concretes with significant improvements in shielding properties. The comparison among full-wave simulation results indicates that the proposed method leverages the benefits of both techniques. It achieves a shielding effectiveness exceeding 30 dB from low frequencies up to 8.5 GHz and beyond 55 dB from low frequencies up to 4 GHz. Furthermore, an experimental measurement was conducted to validate the full-wave simulation results. An experimental sample was fabricated according to the simulated proposed structure, and the measured shielding effectiveness confirmed the composite&#39;s capability in wideband electromagnetic shielding. Theoretically, the proposed structure can enhance the concrete&#39;s mechanical characteristics while improving its shielding effectiveness, making it suitable for designing ultra-high-performance concretes.</span></span></span> Composite materials, Electromagnetic interference shielding, Helical additives, Planar arrays, Wideband shielding, Wire mesh 141 154 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-5280-1&slc_lang=en&sid=1 Ayoub Hamidi ayoub_hamidi@cmps2.iust.ac.ir 1800319475328460014291 1800319475328460014291 No School of Electrical Engineering, Iran University of Science and Technology, Tehran 13114-16846, Iran Ahmad Cheldavi cheldavi@iust.ac.ir 1800319475328460014292 1800319475328460014292 Yes School of Electrical Engineering, Iran University of Science and Technology, Tehran 13114-16846, Iran Asghar Habibnejad Korayem ahkorayem@iust.ac.ir 1800319475328460014293 1800319475328460014293 No School of Civil Engineering, Iran University of Science and Technology, Tehran 13114-16846, Iran Department of Civil Engineering, Monash University, Melbourne, VIC, 3800, Australia