Flexible inkjet-printed metamaterial absorber for coating a cylindrical object

Area of Science:

• Electromagnetics
• Materials Science
• Nanotechnology

Background:

• Metamaterial absorbers offer unique electromagnetic properties.
• Flexible and printable absorbers are crucial for conformal applications.
• Inkjet printing provides a scalable and low-cost fabrication method.

Purpose of the Study:

• To propose and demonstrate a novel flexible inkjet-printed metamaterial absorber.
• To investigate the absorption performance of the metamaterial on both flat and curved surfaces.
• To evaluate the absorber's performance under varying polarization and incident angles.

Main Methods:

• Design of a metamaterial unit cell using a modified Jerusalem-cross ring resonator.
• Inkjet printing of silver nanoparticle ink onto a flexible polymer film using a commercial printer.
• Fabrication and characterization of the absorber on flat and cylindrical surfaces (radius 4.56 cm).

Main Results:

• Achieved absorption rate exceeding 99% at 9.21 GHz for both flat and cylindrical configurations.
• Demonstrated high absorption (>96%) for all polarization angles on the cylindrical model.
• Maintained a high absorption rate (95%) up to an incident angle of 30 degrees.

Conclusions:

• The proposed flexible inkjet-printed metamaterial absorber exhibits high absorption performance on conformal surfaces.
• The fabrication method is scalable and suitable for practical applications requiring flexible electromagnetic devices.
• The design shows robustness against polarization and incident angle variations.