Dielectric ceramics-based tunable and frequency-selective electromagnetic interference shields for next-generation applications

摘要

Developing electromagnetic interference (EMI)-shielding materials is urgently required to alleviate the harmful impacts of electromagnetic pollution generated by present-day electronics and telecommunication industries. In this work, we propose novel (Sr_xMg_(1-x))(Ti_(0.95)Sn_(0.05))O_3 (0.025≤ x ≤ 0.10) ceramics prepared via solid-state mixed oxide route to mitigate exceedingly growing electromag-netic pollution. The structural properties of the prepared samples were inves-tigated by X-ray diffraction, Rietveld refinement, Raman spectroscopy, and scanning electron microscopy. The dielectric and shielding properties were determined using a vector network analyzer. Results showed that the synthe-sized dielectrics displayed distinctive frequency-selective EMI shielding effec-tiveness (SE) peaks, owing to the employment of Fabry-Perot cavity resonance. Interestingly, the SE peak positions could be tuned by varying the thickness of the shield and the amount of Sr doping. Composition with x = 0.025 showed an excellent EMI SE of up to 32.5 dB with a sample thickness of 2.7 mm, at 23.1 GHz frequency in the K (18-26.5 GHz) band. Similarly, composition with x = 0.10 displayed EMI SE of up to 31.85 dB with a sample thickness of 1.8 mm, at 29.47 GHz frequency in the Ka (26.5-40 GHz) band. These results provide a simple, feasible, and robust approach for designing low-cost, frequency-selec-tive, and tunable EMI shields, especially for next-generation devices and applications.