Radar Module Curved Lens Antenna Alignment
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Solution Overview
Problem
Existing radar modules for speed measurement devices face issues with dispersion of electromagnetic wave intensity distribution due to inaccurately determined lead frame positions and impedance mismatching, leading to deviations in emission direction and measurement errors.
Innovation Solution
A radar module design featuring a substrate with precisely adjusted lens and antenna positions, utilizing a curved lens with flanges and positioning bosses to ensure accurate alignment and minimize gap between the antenna and lens, thereby reducing intensity distribution dispersion and allowing for a smaller lens size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a lens is mounted with a gap above the antenna to allow electromagnetic wave propagation, then the device complexity is reduced and ease of manufacture is improved, but the intensity distribution dispersion increases and measurement precision deteriorates
Solution Approach 1:
The patent employs a curved lens surface (spheroidal or aspherical) instead of a flat surface to focus electromagnetic waves more effectively. This curvature enables the lens to converge waves from different parts of the antenna aperture, reducing intensity distribution dispersion and improving measurement precision while maintaining manufacturability through molding processes.
Solution Approach 2:
The patent optimizes the gap distance between the antenna and lens, as well as the lens curvature radius and thickness parameters. By carefully selecting these parameters, the system achieves reduced wave dispersion and improved focusing without requiring complex mechanical adjustments or tight tolerances, thus maintaining ease of manufacture while improving measurement precision.
2Measurement precision
If the lens is positioned closer to the antenna to reduce gap distance, then the intensity distribution dispersion is reduced and measurement precision is improved, but the manufacturing complexity increases and alignment difficulty increases
Solution Approach 1:
The patent integrates the lens and antenna into a single molded assembly or uses a bonding structure that combines both components with fixed relative positioning. This merging eliminates the need for separate mounting operations and complex alignment procedures, reducing device complexity while maintaining the small gap distance required for high measurement precision.
Solution Approach 2:
The lens and antenna are pre-positioned and fixed relative to each other during the manufacturing process (e.g., through co-molding or pre-bonding) before final assembly. This preliminary action ensures accurate alignment and minimizes the gap distance without requiring complex adjustment mechanisms during installation, thereby reducing overall device complexity.
3Measurement precision
If a larger lens is used to improve electromagnetic wave focusing, then the directivity is improved and measurement precision is improved, but the lens size and material usage increase leading to higher cost
Solution Approach 1:
The curved lens surface provides superior focusing capability compared to a flat lens of the same size. This allows the use of a smaller lens diameter while achieving the same or better directivity and measurement precision, thereby reducing material usage and cost.
Solution Approach 2:
The patent optimizes the lens thickness, curvature radius, and dielectric constant parameters to maximize focusing efficiency. By adjusting these parameters, the system achieves high directivity with a smaller lens size, reducing material consumption and manufacturing cost while maintaining measurement precision.
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 achieves a more focused and stable electromagnetic wave emission with reduced dispersion, enhancing measurement accuracy and cost-effectiveness by minimizing lens size and material usage.
Implementation Method 1
the directivity has to be sharpened by a lens
Implementation Method 2
A radar module design featuring a substrate with precisely adjusted lens and antenna positions, utilizing a curved lens
Data Source
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AI summary
To provide a radar module used for a speed measuring device or the like, in which dispersion of intensity distribution of electromagnetic waves emitted from the radar module via a lens is small, the radar module using a substrate with a plane antenna formed on a surface of the substrate includes: a lens having one end face that is plane and another end face that is spherical. In the radar module, a plane side of the lens is disposed to contact the plane antenna, and a spherical side of the lens is disposed in a remote field of the plane antenna.