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2024
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06
New knowledge of the industry. The use of light-curing 3D printing technology to prepare a new micro-95MCT ceramic Longbao lens.
Author:
Recently, the team led by Rujie He of Beijing university of technology published a study entitled A novel mini 0.95 MgTiO3-0.05 CaTiO3 ceramic Luneburg lens fabricated by vat-photopolymerization 3D printing in Ceramics International, and designed a miniaturized k-band flatLongbao Lens, the material is0.95MgTiO 3 -0.05CaTiO 3(95MCT)Ceramics, and the lens was successfully printed using photo-curing 3D printing technology.
Original link: https://www.sciencedirect.com/science/article/abs/pii/S0272884224002426奇遇科技官网:http://www.adventuretech.cn/
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research content
Longbao Lens (LL)Because of its ability to achieve aberration-free wide bandwidth and minimize system complexity and beam cost, it has attracted widespread attention in millimeter-wave communication and radar systems. However, the development of such quality lenses has been hampered by the lack of materials and manufacturing techniques required to vary the dielectric constant.
From the perspective of manufacturing technology, 3D printing provides a perfect solution for micro flat LL with complex metamaterial structure, so this study designed a micro K-band flat LL using 95MCT ceramic, and printed by photo-curing 3D printing.
1, schematic diagram of the preparation process of the light-curing 3D printing plane LL.
△ Figure 2, grease drainage and sintering curves.
Figure 3,(a) Relationship between cured thickness and exposure time at different optical densities. (B) Viscosity vs. shear rate curve of the prepared 95MCT ceramic slurry. Curves of 3D printed blanks (c) TG and DTG,(d) DSC.
4, XRD pattern of 95MCT ceramic.
5,SEM images of:(a) MgTiO3 particles, (B) CaTiO3 particles,(c) interlayers and (d) fractures of 95MCT bodies,(e) fractures of sintered 95MCT ceramics and (f) high magnification images thereof.
6,(a) YOZ cross-sectional dielectric constant distribution of spherical surface LL. (B) The dielectric constant distribution of the YOZ section of the slab LL. (c) Top view structural model and side structural model of slab LL. (d) Schematic diagram of a single cell of a metamaterial structure. (e) Modeling profile of slab LL.
7,(a) Gain as a function of lens focal length, (B) Radiation patterns at different frequencies,(c) Comparison of radiation patterns between SGHA and SGHA with flat LL,(d) Plot of gain and reflection coefficient as a function of frequency.
8; 3D radiation patterns of (a)SGHA and (B) SGHA with flat LL.
△ Fig. 9; Power flow in plane LL at different frequencies (a) 18 GHz,(B) 20 GHz,(c) 22 GHz,(d) 24 GHz,(e) 26 GHz at plane wave normal incidence. (f) The relationship between the focal length of the plane LL and the frequency.
Δ Figure 10;(a) Complete modeling of the proposed plane LL. (B) Comparison of green and sintered samples. (c) Metamaterial structure diagram of the sintered sample. (d) Enlarged view of the innermost layer structure of the metamaterial. (e) Dimensional properties of sintered samples. (For an explanation of the color references in this legend, the reader is referred to the web version of this article.).
△ Fig. 11; 3D printing LL was used for measurement setup and powered by 10 dBi SGHA at the LL focus.
12;(a) S11 of an SGHA employing a molded flat LL was measured and simulated. (B) The gain of an SGHA employing a molded flat LL was measured and simulated.
research conclusion
The K-band 95MCT ceramic flat LL was fabricated by photo-curing 3D printing, and the printing parameters and heat treatment process were optimized.The prepared ceramic has a density of 3.40g/cm³, a bending strength of 81.78 MPa, a dielectric constant of 17.7, and a dielectric loss of 4.56 × 10 plasma. The printed 40mm diameter, 6mm thick LL structure is complex, and the gain is enhanced by more than 5 dBi. 3D printing provides new technologies for the manufacture of complex RF equipment and promotes the application of millimeter wave technology.
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