Radar Device Cover Structure Suppressing Internal Reflections
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Solution Overview
Problem
Radar devices face performance deterioration due to antenna flaws or contamination, leading to abnormal beam patterns and reduced target sensing capabilities, especially when internal reflected waves interfere with the detection process.
Innovation Solution
A radar device structure is designed with specific polarization angles and materials, including dielectric and ferromagnetic components, to prevent internal reflections and protect antennas from external damage, ensuring accurate target sensing by separating transmission and reception signals through orthogonal polarization principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antenna is exposed without protection, then the radar device can normally radiate transmission signals and receive reflected waves, but the antenna may be contaminated with dust or dirt or become flawed, causing abnormal antenna shape or beam pattern
Solution Approach 1:
A cover structure is introduced as an intermediary component between the antenna and the external environment. This cover protects the antenna from dust, dirt, and physical damage while allowing electromagnetic waves to pass through, thus preventing contamination without blocking radar signals.
Solution Approach 2:
The cover is designed as a thin-walled structure that is sufficiently transparent to electromagnetic waves. This thin film approach provides protection while maintaining signal transmission, preventing the antenna from being affected by external contaminants.
2Reliability
If a cover structure is added to protect the antenna, then the antenna is protected from external contamination, but internal reflected waves may interfere with target sensing performance
Solution Approach 1:
The cover structure, which initially causes internal reflections that degrade performance, is equipped with absorbing materials or designed with specific impedance characteristics. This converts the harmful reflected waves into absorbed energy, eliminating interference while maintaining the protective function.
Solution Approach 2:
The electromagnetic parameters of the cover (such as dielectric constant, thickness, or surface impedance) are optimized to minimize internal reflections. By adjusting these parameters, the cover allows transmitted signals to pass through while suppressing unwanted reflections that would interfere with target detection.
3Measurement precision
If internal reflected waves are present in the radar device, then the transmission and reception signals may be contaminated, but adding protective structures increases device complexity
Solution Approach 1:
The protective cover and the reflection suppression functionality are merged into a single integrated component. Instead of adding separate absorbing materials or additional structures, the cover itself is designed with electromagnetic properties that simultaneously provide protection and eliminate internal reflections.
Solution Approach 2:
The cover structure serves multiple functions: it protects the antenna from physical damage and contamination, maintains structural integrity, and suppresses internal reflected waves. This multi-functional design avoids increasing device complexity while achieving multiple objectives.
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 effectively reduces internal reflection interference, maintaining antenna performance and preventing target detection errors by ensuring that only intended signals pass through the system, thereby enhancing radar device accuracy and reliability.
Implementation Method 1
at least one transmission antenna configured to output a transmission polarization signal having a predetermined transmission polarization angle
Implementation Method 2
at least one reception antenna configured to receive a reception polarization signal having a predetermined reception polarization angle
Implementation Method 3
between the transmission antenna and the upper cover, a first transmission-side dielectric, the first transmission-side strip conductor, the transmission-side ferromagnetic material, the second transmission-side strip conductor, and a second transmission-side dielectric may be stacked in that order
Data Source
AI summary
Embodiments disclosed herein relates to a radar device, and more particularly, to a radar device having a structure that reduces the influence of an internal reflected wave, which is capable of preventing a target sensing performance from being deteriorated by a reflected wave reflected within the radar device, while having a cover structure that is capable of protecting an antenna from the outside.