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Design and Full Characterization of a 3D-Printed Hyperbolic Pyramidal Wideband Microwave Absorber
IEEE Antennas and Wireless Propagation Letters ( IF 4.2 ) Pub Date : 2021-01-01 , DOI: 10.1109/lawp.2020.3037718
Xhoandri Lleshi , Thi Quynh Van Hoang , Brigitte Loiseaux , Didier Lippens

A fully 3-D-printed wideband metamaterial absorber, characterized by an absorptivity above 0.95 in the X and Ku-bands and with a fractional bandwidth of 0.71, is presented in this letter. A 250 mm × 250 mm sample, with a total thickness of 6.3 mm (0.26λ0), is fabricated exploiting the fused deposition modeling technique with commercial filaments. To achieve a wideband absorption, a hyperbolic metamaterial with a pyramidal shape is designed by vertically stacking multiple resonant cavities. Lossy filaments are used to increase the dissipative losses and cavities with tailored dimensions are designed to absorb equidistant frequencies to obtain a unitary and flat absorption. The measurements are performed for different azimuth and incident angles, for both vertical and horizontal polarizations in anechoic and nonanechoic chambers. For normal incidence, thanks to the symmetry of the structure, quasi-unitary absorption is obtained over a wide frequency range from 8.2 to 17.2 GHz for azimuthal rotations of 90°. For oblique incidence, the absorption behavior in vertical polarization is better than the one in horizontal polarization. Two cases at azimuth angles of 0° and 30°, corresponding to the best and the worst performances of the presented absorber, are demonstrated in this letter.

中文翻译:

3D 打印双曲金字塔宽带微波吸收器的设计和完整表征

这封信中介绍了一种完全 3D 打印的宽带超材料吸收器,其特征是 X 和 Ku 波段的吸收率高于 0.95,分数带宽为 0.71。一个 250 毫米 × 250 毫米的样品,总厚度为 6.3 毫米(0.26λ0),利用商业灯丝的熔融沉积建模技术制造。为了实现宽带吸收,通过垂直堆叠多个谐振腔来设计具有金字塔形状的双曲超材料。有损耗的灯丝用于增加耗散损耗,并且具有定制尺寸的腔被设计为吸收等距频率以获得单一且平坦的吸收。测量是针对不同方位角和入射角进行的,包括消声室和非消声室中的垂直和水平极化。对于法向入射,由于结构的对称性,在 8.2 至 17.2 GHz 的宽频率范围内,对于 90° 的方位角旋转,可以获得准单位吸收。对于斜入射,垂直极化的吸收行为优于水平极化的吸收行为。在这封信中展示了方位角为 0° 和 30° 的两种情况,对应于所提出的吸波器的最佳和最差性能。
更新日期:2021-01-01
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