Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Broadband-Millimeter-Wave Absorber Based on ε-(TiIVCoII)xFeIII2−2xO3 for Advanced Driver Assistance Systems
Asuka NamaiKoreyoshi OgataMarie YoshikiyoShin-ichi Ohkoshi
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2020 Volume 93 Issue 1 Pages 20-25


High-speed wireless communication plays a significant role in the Internet of Things (IoT) era. 120-GHz and 140-GHz band millimeter waves have potential in broadcasting wireless communications, wireless data transmissions between cellular base stations, and traffic monitoring sensors in intersection areas for advanced driver assistance systems (ADAS). Herein we report a magnetic millimeter wave absorber composed of TiIV–CoII substituted ε-Fe2O3, which is a series of ε-(TiIVCoII)xFeIII2−2xO3 nanomagnets (0 ≤ x ≤ 0.048). ε-(TiIVCoII)xFeIII2−2xO3 shows magnetic hysteresis loops, and the coercive field changes from 20.0 kOe (x = 0) to 8.4 kOe (x = 0.048) with increasing x. Terahertz time domain spectroscopy (THz-TDS) measurements show that ε-(TiIVCoII)xFeIII2−2xO3 exhibits millimeter wave absorption peaks at 140 GHz with full width at half maximum (Δf) = 15 GHz for x = 0.033 and at 121 GHz with Δf = 24 GHz for x = 0.048. These broadband absorptions are useful for noise suppression over a wide frequency range.

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