Variable Thickness Radar Cover for Millimeter Wave Attenuation
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Solution Overview
Problem
Conventional radio-wave transmitting covers in millimeter wave radar devices attenuate waves significantly at larger incident angles, limiting the angular range of detection and detection accuracy near the outer edges.
Innovation Solution
A radio-wave transmitting cover with a thickness that varies gradually from a reference position, where the thickness is set by multiplying half of the wavelength by an integer, to minimize wave attenuation across different incident angles, using expressions that account for transmission coefficients and phase changes to achieve local minimum attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thickness of the cover is increased to reduce attenuation at larger incident angles, then the detection accuracy near the outer edge of the angular range improves, but the attenuation at 0° incident angle increases
Solution Approach 1:
Different regions of the cover are assigned different thickness values tailored to their specific functional requirements. The center region maintains optimal thickness for 0° incidence, while peripheral regions have increased thickness to improve detection accuracy at larger incident angles, with each region's thickness independently optimized for its local detection requirements.
Solution Approach 2:
The solution moves from a one-dimensional uniform thickness parameter to a two-dimensional spatially varying thickness distribution. By introducing spatial variation in the thickness parameter across the cover surface, the system simultaneously optimizes performance across multiple angular dimensions without compromising any single angle.
2Measurement precision
If the thickness of the cover is made variable to widen the angular range of detection, then the detection accuracy across different angles improves, but the manufacturing complexity increases
Solution Approach 1:
The cover employs a smoothly curved thickness variation rather than abrupt changes or complex multi-layer structures. This continuous curvature in the thickness profile simplifies manufacturing compared to stepped or segmented designs, while still achieving the desired angular range expansion and detection accuracy improvement.
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 effectively suppresses wave attenuation across a wider angular range, enhancing the detection accuracy of millimeter wave radar devices by maintaining low attenuation even at larger incident angles, thereby widening the detection range.
Implementation Method 1
a radio-wave transmitting cover (10) arranged in a radio wave path of a radio-wave radar device (90)
Implementation Method 2
the thickness of the cover is gradually changed such that the greater a distance from the reference position, the greater becomes a difference by which the thickness of the cover is larger than the reference thickness
Implementation Method 3
γ: Fresnel reflection coefficient
Data Source
AI summary
A radio-wave transmitting cover is configured to be arranged in the path of the radio wave of a radio-wave radar device. The thickness of the cover is set to a reference thickness at a reference position where the incident angle of the radio wave from the radio-wave radar device is 0°. The reference thickness is set to a value obtained by multiplying half of the wavelength of the radio wave by an integer. In the area around the reference position, the thickness of the cover is gradually changed such that the greater the distance from the reference position, the greater becomes the difference by which the thickness of the cover is larger than the reference thickness.