Low-Cost Dielectric Reflective Surface for Low-Level Backscattered Diffuse Reflections

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• 作者：Mustafa K. Taher Al-Nuaimi ; Wei Hong…
• 关键词：Radar cross section ; Diffuse reflections
• 刊名：Journal of Infrared, Millimeter, and Terahertz Waves
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：38
• 期：2
• 页码：155-165
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Electrical Engineering; Electronics and Microelectronics, Instrumentation; Classical Electrodynamics;
• 出版者：Springer US
• ISSN：1866-6906
• 卷排序：38

文摘

This article presents the design of non-subwavelength, non-resonant, and non-absorptive dielectric surface that creates a low-level backward diffuse reflections under illumination of a far-field plane wave at millimeter wave regime. Thus, radar cross section reduction of a solid metallic object can be achieved. The dielectric surface is consist of unit cells of only two different electric permittivity (ε_r1 = 6.14 and ε_r2 = 3.49) distributed across the surface aperture to achieve low-level backscattered diffuse reflections. The unit cells used are having non-subwavelength size (0.53λ_80GHz) which ensures an easier fabrication of the presented surface using low cost simple PCB technology, in particular at high frequencies. RCS reduction of more than 10 dBsm is achieved from 70 to 87 GHz (BW ≈ 21.65 %) using the presented dielectric surface of optimized permittivity distribution. The RCS reduction capabilities of the presented surface are studied theoretically under both normal and oblique incidences and then fabricated and verified experimentally by reflectivity measurements.