Automotive Radar Radome Structure for Interference Wave Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radar apparatuses suffer from interference wave leakage through the radome, which deteriorates antenna directivity and leads to distance measurement errors.
Innovation Solution
A radar apparatus with a metal member, radome, and a radio wave absorbing member between the substrate and radome, where the absorbing member has an opening corresponding to the radiating portion and includes an insulator to absorb radio waves, preventing interference wave leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a radome is disposed to protect the antenna from external impact and dirt, then the antenna is protected, but interference waves leak from the radome and antenna directivity deteriorates
Solution Approach 1:
A radio wave absorbing member is introduced as an intermediary component between the radome and the antenna substrate. This absorbing member selectively absorbs interference waves propagating within the radome while allowing the main radiated waves to pass through the opening, thereby preventing interference wave leakage without compromising antenna protection or directivity.
2Object-generated harmful factors
If an EMI shield is disposed between the substrate and radome to prevent interference, then electromagnetic interference is reduced, but interference wave leakage cannot be completely prevented
Solution Approach 1:
The invention changes the functional parameter of the shielding component from simple electromagnetic reflection (EMI shield) to active radio wave absorption. The radio wave absorbing member is designed with specific absorption characteristics that enable it to selectively attenuate interference waves at different angles and frequencies, providing more effective suppression of interference wave leakage.
3Object-generated harmful factors
If a radio wave absorbing member is added between the substrate and radome to absorb interference waves, then interference wave leakage is prevented, but device complexity increases
Solution Approach 1:
The radio wave absorbing member utilizes porous or composite absorbing materials that provide effective interference wave absorption with relatively simple structural implementation. The opening in the absorbing member is strategically positioned to align with the radiating portion, creating an effective interference suppression structure without requiring complex multi-component assemblies.
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
Prevents interference wave leakage, maintains antenna directivity, and reduces distance measurement errors by effectively absorbing radio waves, while ensuring easy assembly and structural integrity.
Implementation Method 1
a radio wave absorbing member disposed between the substrate and the radome, having an opening formed in a portion corresponding to the radiating portion, and including an insulator configured to absorb a radio wave
Data Source
AI summary
[Object]Provided are a radar apparatus that can prevent the leakage of interference waves from a radome, and an on-vehicle sensing system including the radar apparatus.[Solving Means]The radar apparatus of the present disclosure includes a substrate having an antenna structure in which a radiating portion for a radio wave is provided on a first surface, a radome disposed to face the first surface of the substrate, and a radio wave absorbing member disposed between the substrate and the radome, having an opening formed in a portion corresponding to the radiating portion, and including an insulator configured to absorb a radio wave.