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<p>This research provides a comparative evaluation of the microstructure, ferroelectric characteristics, microwave performance, and electromagnetic interference (EMI) shielding effectiveness of barium titanate (BT) synthesized using two methods: high-energy planetary ball milling (HEBM-BT) and the traditional solid-state reaction technique (conventional-BT). The structural, vibrational, and surface morphological characteristics of the BT ceramics were analyzed using x-ray diffraction (XRD), Raman spectroscopy, and field-emission scanning electron microscopy (FESEM), respectively. The high polarization value of approximately 16.44 μC/cm<sup>2</sup> for HEBM-BT was identified as a critical factor in enhancing the shielding effectiveness through absorption. BT-based meta-absorbers were designed to tackle EMI issues, and their dielectric and shielding characteristics were analyzed using a vector network analyzer across a wide frequency range of 8–18&#xa0;GHz. The optimized impedance matching resulted in reflection loss values of approximately −83.6&#xa0;dB and −86.1&#xa0;dB at 8.9&#xa0;GHz and 13.6&#xa0;GHz for HEBM-BT, and around −74.8&#xa0;dB and −65.2&#xa0;dB at 9.7&#xa0;GHz and 15.6&#xa0;GHz for conventional-BT, respectively. Meta-absorbers based on BT were designed and simulated using CST software, with resonance peaks demonstrating high absorption efficiency. Absorptivity values of 97.41% at 9.92&#xa0;GHz for HEBM-BT and 95.4% at 16.4&#xa0;GHz and 86.8% at 17.9&#xa0;GHz for conventional-BT were achieved in the X-band and Ku-band, respectively. Ceramic-based meta-absorbers are highly promising for applications in mitigating EMI, enhancing multilayer chip inductors (MLCIs), providing electromagnetic shielding, and supporting 5G mobile antenna systems in high-frequency ranges.</p>

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Wideband Microwave Absorption-Dominant EMI Shielding Using Metasurface-Based Absorber with Barium Titanate Ceramic Substrate for X-Band and Ku-Band Application

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Dibyaranjan Das,
  • Ritu Roumya Samal,
  • Arpita Priyadarsini Dikshit,
  • Sanjeet Kerai,
  • Siba Majhi,
  • Kajal Parashar,
  • S K. S. Parashar

摘要

This research provides a comparative evaluation of the microstructure, ferroelectric characteristics, microwave performance, and electromagnetic interference (EMI) shielding effectiveness of barium titanate (BT) synthesized using two methods: high-energy planetary ball milling (HEBM-BT) and the traditional solid-state reaction technique (conventional-BT). The structural, vibrational, and surface morphological characteristics of the BT ceramics were analyzed using x-ray diffraction (XRD), Raman spectroscopy, and field-emission scanning electron microscopy (FESEM), respectively. The high polarization value of approximately 16.44 μC/cm2 for HEBM-BT was identified as a critical factor in enhancing the shielding effectiveness through absorption. BT-based meta-absorbers were designed to tackle EMI issues, and their dielectric and shielding characteristics were analyzed using a vector network analyzer across a wide frequency range of 8–18 GHz. The optimized impedance matching resulted in reflection loss values of approximately −83.6 dB and −86.1 dB at 8.9 GHz and 13.6 GHz for HEBM-BT, and around −74.8 dB and −65.2 dB at 9.7 GHz and 15.6 GHz for conventional-BT, respectively. Meta-absorbers based on BT were designed and simulated using CST software, with resonance peaks demonstrating high absorption efficiency. Absorptivity values of 97.41% at 9.92 GHz for HEBM-BT and 95.4% at 16.4 GHz and 86.8% at 17.9 GHz for conventional-BT were achieved in the X-band and Ku-band, respectively. Ceramic-based meta-absorbers are highly promising for applications in mitigating EMI, enhancing multilayer chip inductors (MLCIs), providing electromagnetic shielding, and supporting 5G mobile antenna systems in high-frequency ranges.