The electromagnetic properties of re-entrant dielectric honeycombs

Smith, F.C.; Scarpa, Fabrizio; Chambers, B.

doi:10.1109/75.888829

Cited by 48 publications

(10 citation statements)

References 5 publications

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“…The electromagnetic and acoustic properties are enhanced too. Indeed, re-entrant honeycomb structures have more benefits than conventional honeycomb [ 75 ]. Howell [ 76 ] studied an auxetic foam as an acoustic absorber, discovering good properties.…”

Section: Auxetic Materialsmentioning

confidence: 99%

Fused Deposition Modelling of Polymeric Auxetic Structures: A Review

et al. 2023

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Additive Manufacturing (AM) techniques have recently attracted the attention of scientists for the development of prototypes with complex or particular geometry in a fast and cheap way. Among the different AM processes, the Fused Deposition Modelling process (FDM) offers several advantages in terms of costs, implementation features and design freedom. Recently, it has been adopted to realise auxetic structures, which are characterised by negative Poisson ratio, enhanced mechanical properties, and a higher compression resistance than conventional structures. This review outlines the use of AM processes, in particular FDM, to design and obtain auxetic structures, with the final aim to exploit their applications in different fields. The first part of this work presents a brief classification of auxetic structures and materials. Subsequently, a summary of additive manufacturing processes is presented, focusing on the use of FDM and its limitations. Finally, the studies on the use of additive manufacturing to produce auxetic structures are shown, evidencing the potential of the concurrent combination of a fast prototyping technique such as FDM and the characteristics of polymer- and/or composite-based auxetic structures. Indeed, this new technological field opens the possibility of realising novel structures with integrated smart behaviour, multifunctional properties, compression resistance, and a tailored microstructure and shape.

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Section: Auxetic Materialsmentioning

confidence: 99%

Fused Deposition Modelling of Polymeric Auxetic Structures: A Review

et al. 2023

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“…Yanfei He have adapted strong perturbation theory to studied absorbing properties of different structural parameters and derived the expression of the equivalent electromagnetic parameters of the honeycomb structure absorbing materials 16,17 . In addition, Smith also researched the equivalent electromagnetic parameters of concave honeycomb 18,19 . And Tang studied the influence of honeycomb size and skin thickness on the equivalent electromagnetic parameters of honeycomb 20 .…”

Section: Figurementioning

confidence: 99%

“…16,17 In addition, Smith also researched the equivalent electromagnetic parameters of concave honeycomb. 18,19 And Tang studied the influence of honeycomb size and skin thickness on the equivalent electromagnetic parameters of honeycomb. 20 However, it is not enough to research single-layer periodic hole structure in engineering practice.…”

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confidence: 99%

Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole‐core structure wave‐transmitting materials

Qin

Gao

et al. 2023

Micro & Optical Tech Letters

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The variation law of equivalent dielectric properties of sandwich hole-core structure materials are investigated based on the analysis method, where the hole-core structure can be three kinds of structures, such as square, hexagon, and circle. Considering the hole-core structure is anisotropic, the calculation method of the electromagnetic parameters on the sandwich hole-core structure wave-transmitting materials are first derived. The accuracy of this method is validated by a numerical example of a plane wave incidence on a sandwich hole-core structure materials in free space. In addition, an S-parameter inversion method is proposed to calculate the equivalent dielectric and the results using phase-compensated to solve the inaccurate calculation of the dielectric around the S-parameter half-wavelength resonance. Finally, according to this model, the equivalent dielectric constant increases with increasing the incident angle for transverse electric (TE) polarized wave incidence and transverse magnetic (TM) polarized wave incidence, while an opposite phenomenon occurs for TE polarized wave incidence and TM polarized wave incidence on equivalent loss tangent.analysis method, sandwich hole-core structure wave-transmitting materials, The variation law of equivalent dielectric properties How to cite this article: Qin L, Yu C-Y, En L, Tu Y-H, Long J-W. Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole-core structure wave-transmitting materials.

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“…They are also used in EM window applications with high strength with respect to weight ratio and low-density support for absorbing materials [4,5]. Other applications include honeycomb air ventilation panels, different antenna substrates, anechoic chamber rooms, and low-weight antenna reflectors [6].…”

Section: Jinst 14 P09006mentioning

confidence: 99%

“…Figure 2 shows the configuration of a unit cell of conducting honeycomb whose geometries are defined completely by homogeneous and isotropic material of r = 1 and µ r = 1. The conventional honeycomb is a hexagonal six walls (facets) 2-D cellular structure of equal length shaped in a regular manner with equal internal angles [4].…”

Section: Jinst 14 P09006mentioning

confidence: 99%

Design of compact multi-layer microwave absorber for ultra-wide band applications thru shaping and RAM technologies

El-Hakim

Mahmoud

2019

J. Inst.

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The present paper deals with improving the radar cross section reduction (RCSR) of a manufactured compact double-layer radar absorber material (RAM). The basic idea is to monitor the RCS performance of both operating frequency bands and electromagnetic wave (EMW) incidence angles by means of three altered structures. The interaction of EM fields with the three different structure geometries has been studied through the homogenization and/or forward-backward propagation approaches. Firstly, shaping a manufactured double-layer structure by way of uncoated periodic honeycomb is considered. Then, lonly a periodic coated honeycomb composite structure along with the expressions for its effective EM material properties are presented. Finally, multilayered radar absorbing structure (RAS) has been studied through adding another planar thin RAM by using the extracted effective EM material properties of a periodic coated honeycomb composite structure. Genetic algorithm (GA) was applied in all RAS to optimize the thicknesses and/or material properties for better absorption of the incident EM wave. The effective material properties are measured through rectangular waveguide WR-90 and microstrip line fixtures. Comparing the results obtained from both measured and numerical solutions of the actual cross-sectional geometry, the engineered third planar layer is then manufactured to cover X, Ku and K bands up to 60 • incident angles. The simulated results show that the designed structures an effective absorption values less than −10 dB on average in the desired bandwidths and angle of incidents for TE & TM modes. Bistatic experiment showed that the RCS values for the proposed RAS achieved more than −10 dB.

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The electromagnetic properties of re-entrant dielectric honeycombs

Cited by 48 publications

References 5 publications

Fused Deposition Modelling of Polymeric Auxetic Structures: A Review

Fused Deposition Modelling of Polymeric Auxetic Structures: A Review

Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole‐core structure wave‐transmitting materials

Design of compact multi-layer microwave absorber for ultra-wide band applications thru shaping and RAM technologies

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