Comb-Shaped EMI Shield Inserted in PCB Slot
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Solution Overview
Problem
Electromagnetic interference between high-frequency signal lines on circuit boards is significant due to induced currents and voltages, which degrades performance, and existing solutions like electromagnetic shields require additional processing and are difficult to detach for reconfiguration.
Innovation Solution
An electromagnetic interference blocking device is mounted in a slot on the circuit board without soldering or welding, featuring a comb-shaped design for easy insertion and adjustment, and includes additional elements like fixing parts and stabilizers for secure positioning and easy detachment, allowing for reduced interference without increasing circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electromagnetic shields are mounted between neighboring signal lines to reduce electromagnetic coupling, then the induced voltage and current are reduced, but additional processing steps such as soldering or welding are required and the shields are difficult to detach for reconfiguration
Solution Approach 1:
A slot is introduced as an intermediary structure between the signal lines and the electromagnetic shield. The slot allows the shield to be inserted and positioned without requiring soldering or welding operations, thereby reducing manufacturing complexity while maintaining the electromagnetic shielding function
Solution Approach 2:
The electromagnetic shield is designed as a separate, detachable component that can be independently inserted into and removed from the slot. This segmentation allows the shield to be easily repositioned or replaced without affecting other circuit components, addressing the reconfiguration difficulty
2Object-affected harmful factors
If electromagnetic shields are mounted between neighboring signal lines to reduce electromagnetic coupling, then the induced voltage and current are reduced, but the device complexity and number of additional components increase
Solution Approach 1:
The slot structure is integrated directly into the circuit board substrate, combining the mounting feature with the board structure itself. This eliminates the need for separate mounting brackets or additional fastening components, reducing overall device complexity while maintaining effective electromagnetic shielding
3Object-affected harmful factors
If the distance between signal lines is increased to reduce mutual inductance and capacitance, then electromagnetic coupling is reduced, but the size of the circuitry increases
Solution Approach 1:
An electromagnetic shield is introduced as a mediator component positioned between closely-spaced signal lines. This shield blocks electromagnetic fields and reduces mutual inductance and capacitance without requiring increased distance between the signal lines, thereby maintaining compact circuitry size
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 reduces electromagnetic interference between signal lines while maintaining a compact circuit design, facilitating easy examination and repair by allowing the device to be easily detached and repositioned without additional processing steps.
Implementation Method 1
When a current flows through a signal line, an electromagnetic field may be generated. The electromagnetic field, in turn, may generate an induced current/voltage in a neighboring signal line
Data Source
AI summary
An electromagnetic interference blocking device is provided for blocking electromagnetic interference between transmission lines formed on a surface of a circuit board. The electromagnetic interference blocking device includes a body configured to be inserted into a slot formed in the surface of the circuit board between the transmission lines, the body including a bottom portion having a comb shape insertable within the slot.