Radio Wave Reflector Surface Layout for Narrow-Angle Front Reflection
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Solution Overview
Problem
Conventional corner reflectors used in radar systems can lead to mistaken target detection due to recursive reflections from adjacent reflectors in a narrow space, causing reflections over a wide range of incident angles.
Innovation Solution
A radio wave reflector design featuring a first flat surface and a first inclined surface, where the areas of both surfaces are balanced to ensure the difference in reflected wave strengths is minimal, and the inclined surface is angled to create an overlap in angular ranges of significant reflection, focusing the reflection within a narrow angular range in the front direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional corner reflector with a square pyramid recessed portion is used, then retroreflection is achieved in a wide range of incident angles, but reflected waves from adjacent reflectors are recursively reflected leading to mistaken target detection
Solution Approach 1:
The reflector surface is divided into distinct regions with different local properties: a flat surface region and an inclined surface region. Each region reflects radio waves in different directions, with the flat surface providing broad angular coverage and the inclined surface directing reflection toward the front direction, thereby achieving both wide adaptability and improved reliability
Solution Approach 2:
The reflector is segmented into multiple functional surfaces (flat surface and inclined surface) rather than using a single uniform structure. This segmentation allows different parts of the reflector to perform different functions - the flat surface handles wide-angle reflection while the inclined surface focuses energy in the front direction, preventing recursive reflections
2Productivity
If multiple corner reflectors are placed in a narrow space, then radar detection coverage is improved, but recursive reflection between adjacent reflectors causes mistaken target detection
Solution Approach 1:
By giving different local reflection characteristics to different parts of the reflector (flat vs. inclined surfaces), the reflected waves from multiple adjacent reflectors follow different paths and do not recursively reflect between them, maintaining detection accuracy while improving coverage
Solution Approach 2:
Instead of using the conventional square pyramid recessed portion that reflects waves back along the incident path, this invention uses a flat surface combined with an inclined surface that redirects reflection toward the front direction, inverting the traditional reflection geometry to eliminate recursive reflection problems
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 design enables focused radio wave reflection within a narrow angular range in the front direction, reducing the likelihood of mistaken target detection and enhancing the accuracy of radar systems.
Implementation Method 1
a first flat surface 110 that reflects a radio wave
Implementation Method 2
a first inclined surface 120A that is connected to at least part of outer edges of the first flat surface 110, is inclined with respect to the first flat surface 110, and reflects a radio wave
Data Source
Figure 1A~1B
Figure 1C
Figure 1D
AI summary
A radio wave reflector is provided that enables radio waves to be reflected within a narrow angular range in a front direction. The radio wave reflector includes a first flat surface that reflects a radio wave as well as a first inclined surface that is connected to at least part of the outer edges of the first flat surface, is inclined with respect to the first flat surface, and reflects a radio wave. The area of the first flat surface and the area of the first inclined surface have a relationship in which the difference between the maximum value of the strengths of reflected waves from the first flat surface and the maximum value of the strengths of reflected waves from the first inclined surface is equal to or smaller than a predetermined value. In an angular distribution of reflected waves with respect to a normal passing through the center of the first flat surface, the first inclined surface is inclined with respect to the first flat surface so that an overlap is formed between an angular range in which the reflected wave from the first flat surface has a predetermined strength or higher and an angular range in which the reflected wave from the first inclined surface has the predetermined strength or higher.