PCB Ground Loop Layout for Housing Antenna Noise Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The performance of an antenna in electronic devices is deteriorated due to the presence of electronic components adjacent to the housing and the flexible printed circuit board, which generates noise and parasite components, affecting radiation performance.
Innovation Solution
The electronic device includes a housing with a side wall used as an antenna, a printed circuit board with a ground part, and a connection member with an extension part along the side wall, electrically connected to the ground part, reducing interference from noise and parasite components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic components and flexible printed circuit board are disposed adjacent to the housing, then various functions can be implemented, but antenna radiation performance deteriorates due to noise and parasite components
Solution Approach 1:
The patent extracts the harmful electromagnetic interference from the system by introducing a ground switch that selectively connects electronic components to ground. This isolates the noise-generating components from the antenna's electromagnetic field, removing the harmful effect while preserving the functional components' operation. The ground switch acts as a separator between the useful function (electronic components operating) and the harmful effect (electromagnetic interference with antenna).
Solution Approach 2:
The ground switch serves as an intermediary element between the electronic components and the ground. It mediates the electromagnetic interference by providing a controlled path to ground for noise signals, preventing them from coupling into the antenna. This intermediary structure allows the system to maintain both functional capability and antenna performance by managing the interaction between components and radiation elements.
2Reliability
If matching element or ground switch is used to improve antenna performance, then radiation performance can be improved, but device complexity increases
Solution Approach 1:
The ground switch is designed to serve multiple functions within a single structure: it provides electromagnetic shielding for the antenna, establishes ground connections for electronic components, and enables selective isolation of noise-generating elements. This multi-functionality reduces the need for separate matching elements or additional shielding structures, thereby limiting the increase in device complexity while achieving improved antenna 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 configuration reduces or prevents the lowering of antenna performance by electrically connecting the connection member to the ground part, forming a loop structure that minimizes noise and parasite components.
Implementation Method 1
a connection member including a conductor, wherein the connection member includes an extension part extending along the side wall of the housing, a first part extending from one end of the extension part and connected to the printed circuit board, and a second part extending from an opposite end of the extension part and electrically connected to the at least one ground part
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is an electronic device. The electronic device includes: a housing including a side wall at least partially configured as an antenna, a first printed circuit board disposed in the housing and including at least one ground part, a second printed circuit board, wherein the second printed circuit board includes an extension part extending along the side wall of the housing, a first part extending from one end of the extension part and connected to the first printed circuit board, and a second part extending from an opposite end of the extension part and electrically connected to the at least one ground part, at least one component disposed on the extension part, and a processor disposed on the first printed circuit board, and operatively connected to the at least one component through the first part of the second printed circuit board.