Flexible Circuit Board Ground Conductor Segmentation
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Solution Overview
Problem
Conventional flexible circuit boards with large ground conductors, when bent and cut, create slit portions that act like slots in a slot antenna, leading to noise radiation and exogenous noise reception due to unstable ground potential and unnecessary inductance components.
Innovation Solution
A flexible circuit board with strategically cut and bent design featuring ground conductors and terminals, where the ground conductor has gaps formed by cutting, and additional ground terminals are placed near the ends of these gaps to stabilize the ground potential by connecting to external circuit grounds, preventing noise radiation and exogenous noise reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the circuit board is bent to fit the housing shape, then the circuit board can be installed in the electronic device, but slit portions are created in the ground conductors which act like slot antennas and cause noise radiation
Solution Approach 1:
The ground conductor is divided into multiple separate ground conductor portions (first, second, third, fourth portions) corresponding to different regions of the circuit board. Each portion remains electrically connected to the others through connection conductors, creating a segmented but continuous ground system that accommodates the bent shape without creating harmful slits.
Solution Approach 2:
Connection conductors are introduced as intermediary elements to electrically connect the segmented ground conductor portions. These connection conductors bridge the gaps between ground conductor portions, ensuring continuous ground potential across the bent circuit board while preventing the formation of antenna-like slit structures.
2Stability of the object's composition
If large ground conductors are used, then ground potential stability is improved, but the circuit board requires more space and becomes harder to bend and install
Solution Approach 1:
The large ground conductor is segmented into multiple smaller ground conductor portions distributed across different regions of the circuit board. This segmentation allows the ground system to maintain stability while adapting to the bent configuration, as each portion can be optimally positioned in its respective region without requiring a single large continuous conductor.
Solution Approach 2:
The ground conductor system transitions from a two-dimensional planar structure to a three-dimensional distributed structure. By placing ground conductor portions in multiple layers and regions (first region with first and second portions, second region with third and fourth portions), the system maintains ground potential stability while accommodating the bent three-dimensional shape of the circuit board.
Data Source
AI summary
A circuit board has a flexible board with a principal surface, and a ground conductor provided in the flexible board. The flexible board is cut in at least one portion. The flexible board is bent using the cut portion, so that the flexible board has a first portion and a second portion at a different height from the first portion, and the ground conductor has a gap made by the cutting. At least one ground terminal is provided on the ground conductor near at least one end of the gap to electrically connect the circuit board to a ground provided in an external circuit.