Broadband and High-Efficiency Microwave Absorbers Based on Pyramid Structure

Area of Science:

• Materials Science
• Electromagnetics
• Electromagnetic Interference (EMI) Shielding

Background:

• Microwave-absorbing materials are crucial for over-the-air (OTA) testing.
• Existing materials often require improvements in flame retardancy and absorption bandwidth.

Purpose of the Study:

• To design and fabricate novel pyramid microwave-absorbing materials with enhanced flame-retardant properties.
• To optimize structural parameters for superior microwave absorption performance (MWAP).

Main Methods:

• Utilized flame-retardant absorbers as filler and applied a protective coating.
• Employed a high-frequency structure simulator (HFSS) for structural design and parameter analysis.
• Fabricated and tested the pyramid structures for MWAP and large-angle performance.

Main Results:

• Achieved MWAP of -30 dB from 2.7-18 GHz and -10 dB from 2-18 GHz.
• Demonstrated excellent large-angle MWAP: -10 dB from 2-18 GHz and -30 dB from 4-18 GHz.
• Investigated the absorption mechanism, highlighting the role of the pyramid tip and impedance gradient.

Conclusions:

• The pyramid structure effectively acts as a multilayer absorber due to its impedance gradient.
• The developed material offers a promising solution for advanced microwave absorption applications.
• Provides a viable research approach for future engineering of microwave-absorbing materials.