Space distribution PML model-based absorption material and miniature dark chamber

Abstract

The invention discloses a space distribution PML model-based absorption material and a miniature dark chamber. A wave absorption unit comprises a grounding metal layer, a metal pattern and an intermediate-layer dielectric substrate, wherein the metal pattern is arranged on an upper surface of the intermediate-layer dielectric substrate, the intermediate-layer dielectric plate is arranged on an upper surface of the grounding metal layer, an electromagnetic wave polarized along a fixed direction irradiates the wave absorption unit at a known incident angle, and relative dielectric constant and areflection parameter of relative permeability conform to a certain condition by adjusting the size morphology of the metal pattern. An inner wall of the dark chamber is formed by closely arranging the wave absorption units, and for other positions, except an electromagnetic wave source fixed position, in the dark chamber, the wave absorption unit at the position is arranged according to an incident angle between the electromagnetic wave emission source and the position and according to the condition. An ultrathin absorption surface can be designed with a given frequency band, the wave absorption unit works in an opened or closed planar or curve-surface state with regard to different demands, and the wave absorption unit can be used for constructing the miniature wave absorption dark chamber with wavelength scale.

Description

technical field [0001] The invention relates to a non-uniform perfectly matched layer (PML) absorbing material and a micro-darkroom, in particular to a PML model based on spatially distributed constitutive parameters and an absorbing material and a micro-darkroom construction method based on the above model. Background technique [0002] Perfectly matched layer PML is a hypothetical material model defined by mathematics in computational electromagnetics. When an electromagnetic wave along any polarization is incident on the surface of the PML at any incident angle, the electromagnetic wave will enter the interior of the PML without any reflection. When the PML has a large loss, the transmitted electromagnetic wave energy will be quickly absorbed, and it becomes an ideal wave-absorbing material. However, due to the active and non-Maxwellian nature of its constitutive parameters, it is still a great challenge to fabricate materials with PML properties in experiments. [0003...

AI Technical Summary

Problems solved by technology

But in the modern living environment, it is difficult to find an ideal open space, so there is a microwave anechoic chamber

Microwave anechoic chambers are generally realized by laying absorbing materials on the inner wall, but in order to obtain a quiet zone with similar free space characteristics, the size of the microwave anechoic chamber must be large, usually between tens or thousands of wavelengths, resulting in the construction site and high cost requirements

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