Radio Wave Lens Surface Structure for Dust and Reflection Control
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Solution Overview
Problem
Existing dielectric lenses face manufacturing challenges due to uniform groove depths and filling materials, leading to increased costs and difficulty in preventing dust adhesion and reflection.
Innovation Solution
A radio wave lens with concentrically or symmetrically arranged concave and convex portions on its surfaces, where the depth and height of these features vary based on their distance from the optical axis, designed to reduce multiple reflections and dust adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If uniform depth grooves are provided on both surfaces and filling material is filled, then dust adhesion is suppressed, but manufacturing difficulty increases and cost increases
Solution Approach 1:
The patent applies local quality by providing grooves only on the incident wave side surface of the dielectric lens, while the transmitted wave side surface remains smooth without grooves. This localized approach maintains dust suppression functionality where it is most needed (on the exposed incident surface) while eliminating the manufacturing complexity of processing and filling grooves on both surfaces. The selective placement of grooves optimizes the balance between performance and manufacturability.
2Object-affected harmful factors
If uniform depth grooves are provided on both surfaces and filling material is filled, then dust adhesion is suppressed, but manufacturing cost increases
Solution Approach 1:
The patent reduces manufacturing cost by limiting groove formation and filling operations to only one surface (the incident wave side) rather than both surfaces. This local quality approach decreases material consumption, reduces processing steps, and simplifies the overall manufacturing process while maintaining effective dust suppression on the critical exposed surface.
3Ease of manufacture
If conventional dielectric lens structure is used, then manufacturing is simpler, but multiple reflections occur
Solution Approach 1:
The patent addresses multiple reflections by providing grooves with specific depth ratios (1/4 to 3/4 of wavelength) on the incident wave side surface, creating localized impedance matching zones that reduce reflections without requiring complex multi-layer structures. This approach maintains manufacturing simplicity while effectively suppressing harmful reflections through optimized local groove characteristics.
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 lens effectively reduces dust adhesion and multiple reflections, enhancing detection accuracy and reducing the minimum detectable distance in radar systems.
Implementation Method 1
capable of sufficiently reducing reflection
Implementation Method 2
dielectric lens...depth of each of the concave portions or a height of each of the convex portions is set according to a distance from the optical axis
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A radio wave lens, a radio wave lens apparatus, and a radar apparatus that are resistant to dust adhesion on one surface and capable of sufficiently reducing reflection are provided. A radio wave lens includes a first surface, a second surface, and an optical axis passing through the first surface and the second surface. The first surface has concave portions or convex portions provided concentrically or symmetrically with respect to the optical axis in plan view, and a depth of each of the concave portions or a height of each of the convex portions is set according to a distance from the optical axis.