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Three-Dimensionally Printed K-Band Radar Stealth Lightweight Material with Lotus Leaf Structure
Chuangji Liu1, Yingjie Xu1, Beiqing Huang1
1College of Printing and Packaging Engineering, Beijing Institute of Graphic Communication, No. 1 (Band-2) Xinghua Street, Beijing 102600, China.
Polymers
|September 28, 2024
Summary
A novel biomimetic lotus leaf structure was 3D printed to create a K-band radar wave absorber. This lightweight material demonstrates excellent electromagnetic absorption and mechanical properties for advanced stealth applications.
Area of Science:
- Materials Science
- Electromagnetics
- Biomimetics
Background:
- K-band radar waves require broadband and wide-angle absorbers, which are challenging to design due to short wavelengths.
- Lotus leaf structures offer inspiration for advanced material design due to their unique surface properties.
Purpose of the Study:
- To design and fabricate a resin-based K-band radar wave absorber mimicking a lotus leaf structure.
- To investigate the impact of geometric parameters on electromagnetic absorption and mechanical strength.
- To evaluate the material's potential for K-band radar stealth applications.
Main Methods:
- Utilized Digital Light Processing (DLP) 3D printing for fabricating microscale lotus leaf papillae and antireflection structures.
- Employed UV curing for material formation.
- Investigated electromagnetic absorption performance and mechanical properties through simulation and testing.
- Measured water droplet contact angle to assess surface properties.
Main Results:
- Achieved a water contact angle increase from 56° to 130°, indicating superhydrophobic properties.
- Maximum electromagnetic loss reached -32.3 dB within the K-band (20.8-26.5 GHz).
- Maintained electromagnetic loss below -10 dB even at a 60° radar incidence angle.
- Demonstrated superior mechanical energy absorption per unit volume and mass compared to honeycomb structures.
Conclusions:
- The biomimetic lotus leaf structure is an effective K-band radar wave absorber.
- The 3D-printed material exhibits excellent electromagnetic performance and mechanical strength.
- This lightweight structure shows significant potential for K-band radar stealth applications.
