scholarly journals Advances in Periodic Structures and Manufacturing Technologies for mm-Wave Antennas

2020 ◽  
Author(s):  
Adrián Tamayo Domínguez
Keyword(s):  
Periodic Structures ◽  
Manufacturing Technologies

scholarly journals Investigation of 2D Rainbow Metamaterials for Broadband Vibration Attenuation

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5225
Author(s):  
Han Meng ◽  
Dimitrios Chronopoulos ◽  
Nick Bailey ◽  
Lei Wang
Keyword(s):  
Vibration Suppression ◽  
Periodic Structures ◽  
Laser Doppler Vibrometer ◽  
Testing System ◽  
Curved Beams ◽  
Attenuation Level ◽  
Vibration Attenuation ◽  
Manufacturing Technologies ◽  
Mechanical Shaker ◽  
2D Space

Phononic crystals (PnCs) and metamaterials are widely investigated for vibration suppression owing to the bandgaps, within which, wave propagation is prohibited or the attenuation level is above requirements. The application of PnCs and metamaterials is, however, limited by the widths of bandgaps. The recently developed rainbow structures consisting of spatially varied profiles have been shown to generate wider bandgaps than periodic structures. Inspired by this design strategy, rainbow metamaterials composed of nonperiodic mass blocks in two-dimensional (2D) space were proposed in the present study. The blocks were connected by curved beams and tessellated with internal voids to adjust their masses. In order to demonstrate the effects of the rainbow design, two 2D metamaterials, with periodic and nonperiodic units, respectively, were investigated and manufactured using additive manufacturing technologies. Receptance functions, i.e., displacement frequency response functions, of the manufactured metamaterials were calculated with finite element models and measured with a testing system containing a mechanical shaker, an impedance head, and a laser Doppler vibrometer. The obtained numerical and experimental results showed that the metamaterial with rainbow blocks has extended bandgaps compared with the periodic metamaterial.

Driven periodic structures in random environment

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-85-Pr10-87
Author(s):  
V. M. Vinokur
Keyword(s):  
Random Environment ◽  
Periodic Structures

On the linear theory of waves in media with periodic structures

1991 ◽  
Vol 161 (9) ◽  
pp. 201-209 ◽  
Author(s):  
Polina S. Landa ◽  
V.F. Marchenko
Keyword(s):  
Linear Theory ◽  
Periodic Structures
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