High-transmittance heat-adjustable microwave absorption light window based on thermally induced phase change material

Abstract

The invention discloses a high-light-transmittance heat-adjustable microwave absorption optical window based on a thermally induced phase change material, and belongs to the field of optical transparent electromagnetic shielding and microwave absorption. The high-transmittance microwave absorption light window is composed of a patterned thermally induced phase change material layer, a transparent medium layer and a transparent microwave shielding layer, wherein the patterned thermally induced phase change material layer and the transparent microwave shielding layer are respectively arranged on two sides of the transparent medium layer in parallel. On the premise of high optical transparency, continuous change of the absorptivity of the optical window can be achieved by controlling the temperature, and the peak absorptivity of the optical window at the peak temperature can be nearly 100%. In addition, the peak temperature of the microwave absorption optical window can be adjusted by controlling the sheet resistance of the thermally induced phase change material and the duty ratio of the patterned thermally induced phase change material layer. The application of the phase change material in the GHz field is expanded, and the phase change material has the advantages of being flexible in design, adjustable in heat, wide in application range and the like.

Description

technical field [0001] The invention belongs to the field of optically transparent electromagnetic shielding and microwave absorption, and in particular relates to a high-transmittance thermally adjustable microwave-absorbing light window based on a thermally induced phase change material. Background technique [0002] In recent years, from radar detection, electronic reconnaissance, satellite communication to mobile phone communication, electromagnetic flaw detection, medical diagnosis, etc., electromagnetic wave applications cover various fields from military defense to people's daily production and life. With the continuous development of electromagnetic wave applications, the space has been flooded with electromagnetic wave signals of various frequencies. Since the 1970s, due to the rapid development of microwave semiconductor circuits, microwaves have played an increasingly important role in the field of radio communication technology. While the wide application of mic...

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Problems solved by technology

[0006] 1. These absorbers all work in the THz band. Due to the large difference in the electromagnetic properties of phase change materials in the THz band and the microwave band, the absorption characteristics of this type of THz absorber in the microwave band change, and it is impossible to use this type of THz absorber. The oscilloscope is applied to the microwave band;

[0007] 2. These absorbers are usually built on metal reflective layers, and the pattern of vanadium dioxide has a large duty cycle, resulting in poor opacity or transparency in the optical band, which cannot be applied to optically transparent occasions;

[0008] 3. Existing absorbers are mainly based on ideal phase change materials, and the ideal conductivity after phase change is similar to that of metals; but in practice, the actual conductivity after phase change is far below that of metals; Moreover, the theoretical limit of phase change materials is a change in conductivity of 5 orders of magnitude. In actual use, due to various factors, it is difficult for the change of conductivity of phase change materials to reach 5 orders of magnitude; Some wave absorbers are not effective in practical applications; in addition, existing wave absorbers based on ideal phase change materials are rarely modulated to nearly 100% absorption peaks, so existing wave absorbers are difficult to use in practical applications Modulated to nearly 100% of peak absorption

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