Wearable Antenna PCB Grounding Layout for Noise Isolation
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Solution Overview
Problem
The performance of an antenna in electronic devices is degraded by noise from adjacent electronic components and flexible printed circuit boards, which act as parasitic components, leading to unwanted signal induction and radiation interference.
Innovation Solution
A printed circuit board configuration is introduced, featuring a first printed circuit board with grounding portions and a second printed circuit board with extension portions and conductive traces, connected by a screw, to reduce interference and enhance antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible printed circuit board is used to connect electronic components, then ease of connection and adaptability are improved, but antenna performance is degraded due to parasitic effects and noise interference
Solution Approach 1:
The patent extracts the problematic flexible printed circuit board from the antenna vicinity by introducing a rigid printed circuit board with grounding portions that physically separates the FPCB carrying electronic components from the antenna element, thereby removing the parasitic interference source while maintaining connection functionality
Solution Approach 2:
The rigid printed circuit board acts as an intermediary structure between the flexible printed circuit board and the antenna, providing a grounded barrier that mediates the electromagnetic interaction and prevents parasitic coupling while allowing signal transmission
2Adaptability or versatility
If electronic components are disposed adjacent to the housing to implement various functions, then device functionality is improved, but antenna radiation performance is degraded by noise and parasitic induction
Solution Approach 1:
The patent segments the device structure into distinct functional zones: an antenna region with the housing forming the radiating element, and an electronic component region mounted on the rigid printed circuit board, physically separated by grounding portions that prevent electromagnetic interference between segments
Solution Approach 2:
The rigid printed circuit board with grounding portions serves as an intermediary barrier between the electronic components and the antenna, allowing both to coexist in close proximity while preventing noise and parasitic induction from degrading antenna performance
3Reliability
If a matching element or ground switching method is applied to improve antenna performance, then antenna radiation efficiency is improved, but device complexity is increased
Solution Approach 1:
The patent merges the grounding function with the structural support function by integrating grounding portions directly into the rigid printed circuit board structure, eliminating the need for separate matching elements or ground switching mechanisms 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 solution effectively minimizes noise interference, improving antenna radiation efficiency and overall performance by grounding unwanted parasitic components and enhancing signal integrity.
Implementation Method 1
a conductive trace extending from the first portion to the second portion through the extension portion, where the conductive trace is electrically connected to the at least one grounding portion of the first printed circuit board in the second portion
Implementation Method 2
a screw, where the screw passes through the first printed circuit board and the second portion of the second printed circuit board and is fastened to the bracket
Data Source
AI summary
An electronic device includes: a frame including a side wall and at least partially forming an antenna; a bracket provided within the frame; a first printed circuit board provided on the bracket and including at least one grounding portion; a second printed circuit board provided within the frame; and a screw, where the second printed circuit board includes: a first portion coupled to the first printed circuit board; an extension portion extending from the first portion between the side wall of the frame and the bracket; a second portion extending from the extension portion between the first printed circuit board and the bracket; and a conductive trace extending from the first portion to the second portion through the extension portion, and where the conductive trace is electrically connected to the at least one grounding portion of the first printed circuit board in the second portion.