Electric-Wave Absorber Design for Protective-Layer Frequency Stability
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Solution Overview
Problem
Conventional electric-wave absorbing sheets with a protective layer on the electric resistance film experience a shift in the peak frequency of their absorbing properties, leading to inadequate absorption of desired frequency electric waves.
Innovation Solution
The electric-wave absorber includes a protective layer with a permittivity of 2 or more and 20 or less, and a thickness of 10 μm or more and 150 μm or less, on the electric resistance film, along with a dielectric layer with a permittivity of 2 or more and 8 or less, and a thickness smaller than the reference thickness determined by the frequency and permittivity of the absorption electric waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is provided on the electric resistance film, then the protective function is improved, but the peak frequency of absorbing properties shifts
Solution Approach 1:
The patent specifies precise parameter ranges for the protective layer (permittivity: 2-20, thickness: 10-150 μm) and the dielectric layer (permittivity: 2-8, thickness: 0.02-0.08λ) to control the frequency shift effect. By carefully selecting these parameters, the protective layer can be added without causing significant deviation in the peak absorption frequency
Solution Approach 2:
The patent calculates a reference thickness for the dielectric layer based on the target frequency before adding the protective layer. This preliminary calculation allows the designer to anticipate and compensate for the frequency shift that will occur when the protective layer is added, ensuring the final absorption peak remains at the desired frequency
2Productivity
If the dielectric layer thickness is set to reference thickness, then the absorption frequency is optimized, but adding protective layer causes frequency shift
Solution Approach 1:
The patent adjusts the dielectric layer thickness parameters (permittivity: 2-8, thickness: 0.02-0.08λ) to compensate for the protective layer's effect. By modifying these parameters within specified ranges, the system maintains optimal absorption frequency even with the protective layer present
Solution Approach 2:
The patent establishes a design process where the reference thickness is calculated first, then the protective layer is added, and finally the actual absorption characteristics are evaluated. This feedback loop allows for iterative adjustment of the dielectric layer parameters to achieve the desired frequency response
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
This configuration allows for effective absorption of electric waves in high frequency bands by mitigating the frequency shift caused by the protective layer, while maintaining the protective function and flexibility of the electric-wave absorber.
Implementation Method 1
electric waves reflected from the electric-wave absorber cancel each other out and are absorbed by shifting the phases of the electric waves reflected by the electric-wave shielding layer and emitted to the outside by half the wavelength from the phases of the electric waves reflected by the surface of the electric resistance film
Implementation Method 2
a permittivity D of the dielectric layer is 2 or more and 8 or less
Implementation Method 3
provide a protective layer for protecting the surface of the electric resistance film in order to prevent the surface electric resistance from changing due to damage to the surface of the electric resistance film
Data Source
AI summary
The present invention realizes an electric-wave absorber of a so-called electric-wave interference type, which can favorably absorb absorption electric waves of a desired frequency even when a protective layer for protecting an electric resistance film is formed on the surface of the electric resistance film, and a manufacturing method for the electric-wave absorber. In an electric-wave absorber of an electric-wave interference type, which is formed by sequentially stacking an electric resistance film 1, a dielectric layer 2, and an electric-wave shielding layer 3, absorption electric waves to be absorbed by the electric-wave absorber are waves in a high frequency band in or above a millimeter-wave band, a protective layer 4 is included on the electric resistance film, and a thickness of the dielectric layer is smaller than a reference thickness dst obtained according to the frequency of the absorption electric waves and the permittivity of the dielectric layer.