paper 150302031632

Published: 2015-07-09

Significantly Improved Absorption Properties at Microwave Bands for Multi-layer Hexaferrite Thick Film Composites

Zheng-Wen Li,

Zheng-Wen Li

National University of Singapore, Singapore

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Zhihong Yang

National University of Singapore, Singapore

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Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)2687-2691

Abstract

Z-type hexaferrite, Ba3 Co2 Fe24 O41 , films without any substrate and the multi- layer hexaferrite-film (MLHF) composites have been fabricated using an modified infiltration technology. The microstructure, static and high-frequency magnetic properties and electromag- netic attenuation characteristics have been studied. The hexaferrite films without any substrate can reach a high volume concentration of p = 0.45 and has a certain degree of flexibility to be suitable for application. More importantly, the microwave magnetic properties are greatly im- proved; µ00 = 6 and µ00max = 4.4 increase by 67% and 175%, respectively, as compared to general particle-filler composites. Due to the significantly enhanced permeability and almost the same low permittivity, the absorption properties are greatly improved: return loss RL ≤ −10 dB from 2.1 to 14.6 GHz, bandwidth WP = 150% and thickness t = 0.3 cm. The bandwidth achieves 75% of theoretically maximum value.

Citation

Zheng-Wen Li, and Zhihong Yang, "Significantly Improved Absorption Properties at Microwave Bands for Multi-layer Hexaferrite Thick Film Composites," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)2687-2691

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