Electromagnetic sealing gasketIt is a surface conductive elastic substance. Installing electromagnetic sealing gaskets at the junction of two metals can fill the gap and eliminate conductive discontinuities.
After using electromagnetic sealing gaskets, there are no larger holes in the gaps, which can reduce the leakage of high-frequency electromagnetic waves. The benefits of using electromagnetic sealing gaskets are as follows:
1) Reduce the requirements for processing and allow for lower flatness of the contact surface.
2) Reduce the fastening screws at the joint to increase aesthetics and maintainability.
3) There will be no high-frequency leakage at the gap.
Although electromagnetic sealing gaskets can greatly improve gap leakage in many situations, if the contact surface between two metals is machined (such as milling) and the spacing between fastening screws is less than 3 centimeters, the shielding effectiveness will not be improved after using electromagnetic sealing because the contact impedance of this structure is already very low.
From the working principle of electromagnetic sealing gaskets, it can be known that the electromagnetic leakage of gaps using electromagnetic sealing gaskets is mainly determined by the conductivity of the gasket material and the contact resistance of the contact surface. Therefore, the key to using electromagnetic sealing gaskets is:
1) Choose cushioning materials with good conductivity.
2) Keep the contact surface clean
3) Apply sufficient pressure to the pad (to ensure a sufficiently small contact resistance).
4) The thickness of the pad should be sufficient to fill large gaps
Flexible application of electromagnetic sealing gasket
Unless there is a very high requirement for shielding, continuous use at gaps is not necessary
Electromagnetic sealing gasketIn practice, gaskets can be installed at intervals according to the requirements of shielding effectiveness, and the leakage of small holes formed between each section of gasket can be calculated using the previous formula. Carefully adjust the spacing of the pads on the prototype to meet the shielding requirements while minimizing costs. For civilian products, the spacing between pads can be between λ/20 and λ/100** Products generally require continuous installation.
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