EMI Shield With Spring Contacts for PCB Irregularities
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Solution Overview
Problem
Radar systems, particularly those using MMICs operating at microwave frequencies, face performance degradation and potential system failure due to electromagnetic interference (EMI) from high-frequency electromagnetic fields, which existing technologies have not adequately addressed.
Innovation Solution
The implementation of a shield with flexible or spring-like extensions and gaps that can compress or bend to maintain contact with printed circuit boards, providing effective EMI shielding while also serving as a heat transfer mechanism, made from conductive materials like metal to confine electromagnetic energy and prevent radiation emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid shield is used to provide EMI shielding, then shielding effectiveness is improved, but the shield cannot accommodate circuit board irregularities such as bending or warping
Solution Approach 1:
The shield transitions from a rigid structure to a dynamic structure with spring-like extensions that can flex and compress. These extensions are designed with elastic properties allowing them to deform under force while maintaining contact with the circuit board surface, thus adapting to irregularities while preserving EMI shielding functionality.
Solution Approach 2:
The shield incorporates flexible spring-like extensions that act as compliant contact elements. These extensions are made from conductive materials with elastic properties, allowing the shield to conform to the circuit board surface while maintaining electrical contact for effective EMI shielding.
2Temperature
If gaps are introduced in the shield to reduce weight or improve heat dissipation, then weight reduction or thermal management is improved, but EMI shielding effectiveness deteriorates
Solution Approach 1:
The shield structure implements different properties in different regions: the spring-like extensions provide mechanical compliance and thermal pathways, while the main shield body maintains continuous conductive surfaces for EMI shielding. The gaps are strategically positioned and dimensioned to allow heat dissipation while electromagnetic theory ensures they remain electrically insignificant at the operating frequencies.
3Reliability
If the shield is made from thick conductive material to improve EMI shielding, then shielding effectiveness is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The shield is divided into distinct functional segments: thin spring-like extensions for mechanical compliance and thermal management, and thinner shield body sections for EMI shielding. This segmentation allows each component to be optimized independently for its specific function, reducing overall material usage and manufacturing complexity while maintaining effective shielding.
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
This solution effectively mitigates EMI interference, maintains continuous contact with irregular circuit boards, and facilitates heat transfer, ensuring long-term stability and cost-effective production for radar systems and other electronic devices.
Implementation Method 1
The shield is made of or having a conductive material (e.g., metal) and its one or more extensions contacting the reference voltage of the emitting circuits
Implementation Method 2
a thermal interface material (TIM) may be provided to transfer heat away from the electric circuit
Data Source
AI summary
Various technologies described herein pertain to systems and methods for shielding electric circuits from electromagnetic radiation or radio waves. The systems and methods include, for example, a shield having a body with a top portion and a plurality of side portions extending therefrom. The side portions include one or more extensions acting as spring contacts or spring elements and one or more gaps therebetween. The extensions are, for example, either individually or as a group flexible in that they can compress, bend, or otherwise deform under force thus having a spring characteristic that compensates for PCB irregularities (e.g., warping, bending, etc.)