Dielectric Cover with Phase-Controlled Reflection Hindering Layer
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Solution Overview
Problem
Conventional radar device components, such as radomes and electromagnetic wave transmissive covers, reflect electromagnetic waves, reducing the detection performance of radar devices by obstructing the passage of waves, which is not effectively addressed by existing anti-reflective coatings.
Innovation Solution
An electromagnetic wave transmissive cover with a dielectric base and laminated reflection hindering layers made of dielectric material, where the thickness of the reflection hindering layers is set to a specific phase deviation amount, minimizing wave reflection and maximizing wave transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a radome or electromagnetic wave transmissive cover is used to protect the radar device, then the aesthetic appearance is improved and the radar device is hidden, but electromagnetic wave reflection increases and detection performance deteriorates
Solution Approach 1:
The patent applies a multi-layer composite structure consisting of a base layer and multiple reflection hindering layers with different dielectric constants. This composite material approach allows the cover to simultaneously achieve aesthetic appearance and high electromagnetic wave transmissiveness by controlling wave reflection through layered material properties
Solution Approach 2:
The patent optimizes the thickness of each reflection hindering layer based on the wavelength of electromagnetic waves. By setting the thickness to specific values (e.g., λ/4, λ/2 where λ is the wavelength), the reflection phases are controlled to achieve destructive interference of reflected waves, thereby minimizing overall reflection and maximizing transmissiveness
2Ease of manufacture
If conventional anti-reflective coating is applied to the cover, then surface reflection is reduced, but internal reflection within the cover material is not effectively hindered
Solution Approach 1:
The patent divides the reflection hindering function into multiple separate layers rather than using a single conventional coating. Each layer targets specific reflection interfaces within the cover structure, systematically addressing both surface and internal reflections that conventional single-layer coatings cannot effectively control
Solution Approach 2:
The reflection hindering layers act as intermediary structures between the electromagnetic wave source and the base material. These intermediate layers with specific dielectric properties and thicknesses are designed to control the phase and amplitude of reflected waves, effectively mediating the interaction between electromagnetic waves and the cover structure
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 significantly reduces wave reflection, enhancing the transmissiveness and detection performance of radar devices by ensuring that most electromagnetic waves pass through, thereby improving the radar's ability to detect objects.
Implementation Method 1
An amount of deviation between a phase of a reflected wave reflected on an interface on a front side of the reflection hindering layer in the travel direction and a phase of a reflected wave reflected on an interface on a rear side of the reflection hindering layer in the travel direction is referred to as a phase deviation amount β
Implementation Method 2
the reflection hindering layer being made of a dielectric material, the reflection hindering layer having transmissiveness to the electromagnetic waves
Data Source
AI summary
An electromagnetic wave transmissive cover includes: a base made of a dielectric material and having transmissiveness to electromagnetic waves; and a reflection hindering layer laminated on at least one of two surfaces of the base in a travel direction of the electromagnetic waves, made of a dielectric material, having transmissiveness to the electromagnetic waves, and hindering reflection of the electromagnetic waves. A wavelength of each electromagnetic wave in the reflection hindering layer is referred to as λ2 and 2π/λ2 is set as a phase constant β2. An amount of deviation between a phase of a reflected wave reflected on the front interface of the reflection hindering layer in the travel direction and a phase of a reflected wave reflected on the rear interface is referred to as a phase deviation amount β. Thickness L2 of the reflection hindering layer is set to β/β2.