Honeycomb Radar-Absorbing Structure for Lightweight Broadband Stealth
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Solution Overview
Problem
Current radar-absorbing materials for stealth technology face challenges in durability and weight, leading to performance degradation, and require high nanoparticle loading which complicates dispersion and absorption performance.
Innovation Solution
A honeycomb sandwich structure using metal-coated dielectric fibers, specifically nickel-coated glass fibers impregnated with epoxy resin, to create a broadband electromagnetic wave absorber with improved load-bearing capacity and absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If radar-absorbing material is applied to structural surface, then electromagnetic wave absorption is improved, but weight increases and durability deteriorates
Solution Approach 1:
The patent employs a composite structure combining foam core material with surface coating layers. The foam core provides lightweight structural support while the surface coating layers (conductive polymer or magnetic particle-containing polymer) provide electromagnetic wave absorption functionality. This composite approach allows the structure to achieve radar absorption without the weight penalty of solid bulk materials.
2Loss of energy
If nanoparticle loading is increased to improve absorption performance, then electromagnetic wave absorption is improved, but viscosity increases and dispersion becomes difficult
Solution Approach 1:
The patent uses polymer materials as intermediary substances to incorporate magnetic particles. Instead of directly dispersing high concentrations of nanoparticles in a matrix (which causes viscosity issues), the magnetic particles are integrated into polymer layers that are then applied to the foam core. This intermediary approach facilitates easier processing and dispersion while maintaining high absorption performance.
3Loss of energy
If radar-absorbing material is applied to structural surface, then electromagnetic wave absorption is improved, but maintenance requirements increase
Solution Approach 1:
The foam core structure provides a durable, lightweight substrate that is inherently resistant to degradation. The surface coating layers are applied as protective functional layers that can be designed for environmental stability. This composite architecture separates the structural support function (foam core, high durability) from the radar absorption function (surface coating), allowing each to be optimized independently for both performance and longevity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves excellent electromagnetic wave absorption and radar cross-section reduction, with return loss of −10 dB or less over 2 to 18 GHz and RCS reduction of 10 dB or more across various frequency bands, while maintaining structural integrity.
Implementation Method 1
capable of absorbing broadband electromagnetic waves using electromagnetic properties of a metal-coated dielectric fiber
Implementation Method 2
a metal by an electroless plating technique
Data Source
AI summary
Various embodiments relate to an electromagnetic wave absorber having a honeycomb sandwich structure, which is capable of absorbing broadband electromagnetic waves using electromagnetic properties of a metal-coated dielectric fiber, may comprise: at least two honeycomb core layers in each of which hexagonal units formed of a material comprising the metal-coated dielectric fiber are continuously arranged; and skin layers which are disposed on top surfaces and bottom surfaces of the at least two honeycomb core layers and each include a bottom layer, a top layer, and an intermediate layer. Various other embodiments are possible.