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Coatings 2017, 7(3), 38; doi:10.3390/coatings7030038

A Field Performance Evaluation Scheme for Microwave-Absorbing Material Coatings

School of Information and Electronic Engineering, Shandong Institute of Business and Technology, Yantai 264005, China
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Academic Editor: Giovanni Zangari
Received: 18 January 2017 / Revised: 9 February 2017 / Accepted: 28 February 2017 / Published: 2 March 2017
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Abstract

Performance evaluation is an important aspect in the study of microwave-absorbing material coatings. The reflectivity of the incident wave is usually taken as the performance indicator. There have been various methods to directly or indirectly measure the reflectivity, but existing methods are mostly cumbersome and require a strict testing environment. What is more, they cannot be applied to field measurement. In this paper, we propose a scheme to achieve field performance evaluation of microwave-absorbing materials, which adopts a small H-plane sectoral horn antenna as the testing probe and a small microwave reflectometer as the indicator. When the size of the H-plane sectoral horn antenna is specially designed, the field distribution at the antenna aperture can be approximated as a plane wave similar to the far field of the microwave emitted by a radar unit. Therefore, the reflectivity can be obtained by a near-field measurement. We conducted experiments on a kind of ferrite-based microwave-absorbing material at X band (8.2–12.4 GHz) to validate the scheme. The experimental results show that the reflectivity is in agreement with the reference data measured by the conventional method as a whole. View Full-Text
Keywords: microwave-absorbing materials; coating; performance evaluation; H-plane sectoral horn antenna microwave-absorbing materials; coating; performance evaluation; H-plane sectoral horn antenna
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Guan, S.; Wang, Y.; Jia, D. A Field Performance Evaluation Scheme for Microwave-Absorbing Material Coatings. Coatings 2017, 7, 38.

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