3.3.1.2 The electromagnetic wave scattering characteristics of the concave-convex element structure

3.3.2 The scattering properties of electromagnetically functional textile materials

The reflection of electromagnetic waves on smooth reflective surfaces.

The reflection of electromagnetic waves on rough reflective surfaces.

The woven velvet fabric for decoration and its reflection coefficient is displayed in Figure 22. It can be seen from the test results that the tested

structural unit achieves attenuation of 5 dB in the bandwidth of 10 GHz, and the peak value reaches 30 dB. This is mainly due to the angle between the metal fluff of the structural unit and the plane of the sample. When electromagnetic waves are incident onto the sample, those metal fluffs with a certain angle in the plane have a certain scattering of the incident electromagnetic waves, which reduces the energy received by the receiving antenna, so that the reflection

The fibers having electromagnetic properties are scattered as the fluff of the fabric on the surface, or are consolidated as a U-shaped structural unit on the fabric to form the fluff, and thereby a velvet structure fabrics with good radar wave

3.3.2.1 Velvet structure fabrics

Figure 20.

Figure 19.

The law of electromagnetic wave reflection.

Electromagnetic Function Textiles

DOI: http://dx.doi.org/10.5772/intechopen.85586

Figure 21.

scattering property is obtained.

coefficient is reduced.

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Electromagnetic waves are reflected at the interface of different medium, which conforms to the law of reflection, as shown in Figure 19. The concave-convex natural surfaces can be broken down into a series of planar elements with smallsized geometries, which is called roughness. The roughness of the scattering surface is very important in the surface scattering.

If the surface is smooth, the incident energy would form two plane waves after interacting with the surface. One is a surface-reflected wave whose angle with the normal is the same as the angle of incidence, and the direction is opposite, as shown in Figure 20. The other is refracted or transmitted waves with downward surface.

If the surface is rough, the incident energy interacts with the surface and then radiates and shoots in all directions, becoming a scattering field, as shown in Figure 21.

Electromagnetic Function Textiles DOI: http://dx.doi.org/10.5772/intechopen.85586

Figure 19. The law of electromagnetic wave reflection.

Figure 20. The reflection of electromagnetic waves on smooth reflective surfaces.

Figure 21. The reflection of electromagnetic waves on rough reflective surfaces.

3.3.2 The scattering properties of electromagnetically functional textile materials
