Free-Standing Electric-Wave Absorber for 20-300 GHz Shielding
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Solution Overview
Problem
Conventional electric-wave absorbing sheets are flexible and elastic but difficult to use as free-standing structures due to their thinness, while solid block-shaped absorbers are cumbersome and hard to handle. There is a need for an electric-wave absorber that can maintain sufficient surface area and be free-standing with effective absorbing properties in the high frequency band from 20 GHz to 300 GHz.
Innovation Solution
An electric-wave absorber with a plate shape comprising an electric-wave absorbing layer containing magnetic iron oxide powder and carbon-based fine particles, reinforced by a dielectric reinforcing layer, allowing it to stand freely and maintain a predetermined angle relative to incoming waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electric-wave absorbing sheet is made thin to be flexible and elastic, then it can be easily arranged at desired locations, but it becomes difficult to use as a free-standing structure
Solution Approach 1:
The invention combines a resin binder with magnetic iron oxide powder and carbon-based fine particles to create a composite electric-wave absorbing layer. This composite structure provides both the flexibility needed for easy arrangement and the structural integrity required for free-standing capability, resolving the contradiction between ease of operation and strength.
2Strength
If a solid block-shaped electric-wave absorber is used to achieve free-standing capability, then it can stand freely, but it becomes cumbersome and difficult to handle
Solution Approach 1:
The invention uses a thin film structure with a resin binder containing magnetic particles, which maintains flexibility for easy handling while achieving free-standing capability through the composite material properties. This resolves the contradiction by providing a thin, flexible structure that can still stand freely without being cumbersome.
3Area of stationary object
If the electric-wave absorber is made with sufficient surface area to be effective, then it can absorb electric waves properly, but it becomes difficult to maintain as a free-standing thin structure
Solution Approach 1:
The composite material combining resin binder with magnetic iron oxide powder and carbon-based fine particles provides enhanced structural strength that enables large surface area sheets to maintain free-standing stability. The composite structure distributes mechanical stresses across the material, allowing large-area sheets to remain stable while maintaining thin profile for flexibility.
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 absorber effectively shields unwanted electric waves by magnetic resonance and dielectric loss, enabling easy arrangement along wave paths and reducing reflections, with a high attenuation effect.
Implementation Method 1
at least one of magnetic iron oxide powder and carbon-based fine particles that magnetically resonate in a frequency band of 20 GHz to 300 GHz
Implementation Method 2
the reinforcing layer is constituted by a dielectric material
Data Source
AI summary
An electric-wave absorber that has sufficient electric-wave absorbing properties in a high frequency band from 20 GHz to 300 GHz and is capable of free-standing while having a certain surface area or more, and an electric-wave absorbing device using this electric-wave absorber are realized. The electric-wave absorber includes an electric-wave absorbing layer 1 and a reinforcing layer 2 disposed on the surface on the electric wave 10 incident side of the electric-wave absorbing layer, and the electric-wave absorbing layer contains at least one of magnetic iron oxide powder 1a and carbon-based fine particles 1b that magnetically resonate in a frequency band of 20 GHz to 300 GHz, and a binder 1c made of resin, the reinforcing layer 2 is constituted by a dielectric material, and the electric-wave absorber has a plate shape with small thickness with respect to its main surface, and is capable of free-standing.