Enhanced Microwave-Absorbing Property of Honeycomb Sandwich Structure with a Significant Interface Effect

Area of Science:

• Materials Science
• Electromagnetics
• Composite Materials

Background:

• Honeycomb sandwich structures (HSSs) show promise as lightweight microwave absorbers.
• Optimizing impedance matching with free space is crucial for efficient microwave absorption.

Purpose of the Study:

• To design and analyze a novel HSS using SiO2 fiber-reinforced epoxy resin (SiO2f/ER) composites.
• To investigate the contribution of the interface effect on microwave absorption properties.
• To understand the mechanisms behind enhanced microwave absorption in HSS.

Main Methods:

• Design of HSS with SiO2f/ER composite layers.
• Calculation of dielectric properties using multilayer transmission line theory, metal backplane model, and homogenization theory.
• Theoretical, experimental, and numerical analysis of the interface effect.

Main Results:

• The interface effect contributes 1-4% to microwave absorption.
• Analysis of equivalent resistance, capacitance, and inductance revealed enhanced absorption.
• The interfacial transition zone was identified as key to improved performance.

Conclusions:

• The designed HSS exhibits enhanced microwave absorption properties.
• The interfacial transition zone plays a critical role in improving impedance matching and electromagnetic loss.
• SiO2f/ER composites are effective for developing efficient HSS microwave absorbers.