Radar Cavity Coupling Portion Ground Plane ESD Protection
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Solution Overview
Problem
Radar devices face performance degradation due to electrostatic discharge (ESD) phenomena, where external electromagnetic waves cause charge conduction to the RF element, leading to potential noise and interference.
Innovation Solution
A radar apparatus design featuring a cavity with a coupling portion extending to contact the ground plane of the circuit board, ensuring that electric charges conducted to the cavity are safely transferred to the ground, thereby preventing ESD effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cavity is provided to cover the RF element, then electromagnetic wave interference is reduced, but electrostatic discharge can still occur through the cavity
Solution Approach 1:
The patent introduces a coupling portion as an intermediary element between the cavity and the ground plane. This coupling portion extends from the cavity structure to contact the ground plane on the circuit board, serving as a mediator that provides a controlled path for electrostatic discharge while maintaining the cavity's electromagnetic shielding function. The coupling portion acts as a bridge that resolves the contradiction by enabling ESD protection without compromising the cavity's interference reduction capability.
2Object-affected harmful factors
If the cavity is completely enclosed, then electromagnetic shielding is improved, but charge dissipation becomes difficult
Solution Approach 1:
The patent applies local quality by creating a specific opening or coupling region in the cavity structure. Rather than completely enclosing the cavity, the coupling portion is locally introduced to contact the ground plane. This localized modification allows charge dissipation at the specific coupling region while maintaining the enclosed structure's electromagnetic shielding effectiveness in other areas. The local quality principle resolves the contradiction by enabling charge dissipation without compromising overall shielding performance.
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 enhances the ESD robustness of radar devices by removing electric charges from the cavity, thereby preventing electrostatic discharge and maintaining the performance of the RF element.
Implementation Method 1
the coupling portion is inserted into a coupling hole formed in the circuit board to contact a ground plane of the circuit board
Data Source
AI summary
The present disclosure relates to a radar apparatus including a circuit board provided inside a housing having an upper side open, and on which an RF element is mounted on an upper surface, and a cavity having an open lower side and coupled to the upper surface of the circuit board for accommodating the RF element, wherein the cavity includes a coupling portion extending downwardly in a region of a surface coupled to the circuit board, and the coupling portion is inserted into a coupling hole formed in the circuit board to contact a ground plane of the circuit board.