λ/4 Radio Wave Absorber Tuning for Support-Coupled Absorption
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Solution Overview
Problem
Existing λ/4 radio wave absorbers that include a support, resistive film, and dielectric layer do not achieve sufficient absorption performance when assembled, as the absorption performance is not solely dependent on the resistance value of the resistive film and the thickness of the dielectric layer.
Innovation Solution
A λ/4 radio wave absorber that includes a support, a resistive film, a dielectric layer, and a reflective layer, where the resistance value of the resistive film and the combined thickness and relative permittivity of the support and dielectric layer satisfy the formula −0.375x+1086.9<y<−0.375x+1140, optimizing absorption characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resistance value of the resistive film is set to 377Ω and the thickness of the dielectric layer is set to a specific value, then the absorption performance should be improved, but the absorption performance is insufficient when a support is included in the structure
Solution Approach 1:
The patent applies parameter changes by establishing a mathematical relationship (Formula 1) that connects the resistance value of the resistive film with the thickness and relative permittivity of both the support and dielectric layer. This formula enables optimization of absorption performance by adjusting these parameters in combination rather than independently, resolving the contradiction between including a support structure and achieving sufficient absorption performance.
2Reliability
If the thickness of the dielectric layer is increased to improve absorption, then absorption performance improves, but the overall device thickness and complexity increase
Solution Approach 1:
The patent reduces the required thickness of the dielectric layer by considering the combined effect of the support's thickness and relative permittivity in Formula (1). The formula shows that the support's electromagnetic properties contribute to the overall absorption mechanism, allowing a thinner dielectric layer to achieve the same absorption performance, thus resolving the contradiction between absorption performance and device thickness.
3Reliability
If the resistance value of the resistive film is precisely controlled to 377Ω for optimal absorption, then absorption performance improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent relaxes the strict requirement for the resistive film resistance to be exactly 377Ω by introducing Formula (1), which shows that the resistance value can be adjusted in combination with the support and dielectric layer parameters. This mathematical relationship provides flexibility in parameter selection, allowing for broader manufacturing tolerances while maintaining optimal absorption performance.
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 enhances radio wave absorption performance by considering the relative permittivity and thickness of the support and dielectric layer, leading to improved absorption capabilities.
Implementation Method 1
an electromagnetic wave absorber that has a bandwidth of 2 GHz or more in a frequency band of which the absorption of electromagnetic waves is 20 dB or more
Implementation Method 2
the suitable range of resistance values of the resistive film varies depending on the relative permittivity and thickness of the support and the relative permittivity and distance between the resistive film and the reflective layer
Implementation Method 3
a λ/4 radio wave absorber that includes a support, a resistive film, a dielectric layer, and a reflective layer
Data Source
AI summary
An object is to provide a λ/4 radio wave absorber that includes a support, a resistive film, a dielectric layer, and a reflective layer, and that has higher radio wave absorption performance. The object is achieved by a λ/4 radio wave absorber that includes a support, a resistive film, a dielectric layer, and a reflective layer, and that satisfies formula (1): −0.375x+1086.9<y<−0.375x+1140 wherein x represents a resistance value of the resistive film, and y=the thickness of the support×(the relative permittivity of the support)0.5+the thickness of the dielectric layer×(the relative permittivity of the dielectric layer)0.5.