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EMI SHIELDING


•  The shutter system to have a shielding effectiveness per the Dash, Straus & Goodhue study.

•  The shutter system shall have a shielding effectiveness of a least 93.69% attenuation effectiveness, when a tightly sealed electrical contact is made.

•  The shutter system shall have a shielding effectiveness of 24dB attenuation effectiveness, when a tightly electrical seal is made.

One of the most common uses for perforated metal is to enclose electrical devices to attenuate the EMI/RFI radiation they emit and to ventilate them at the same time. Many questions have been asked about which perforated pattern should be used to satisfy both of these design requirements and the shielding effectiveness of various perforated patterns and materials. To answer these questions, the Industrial Perforators Association contracted Intertek Testing Services, testing laboratories in Boxborough, MA to evaluate the shielding effectiveness of 16 perforation and material combinations at 13 frequency levels. The results of these tests with descriptions of the test samples and the frequencies tested are shown in the charts, CLICK HERE TO VIEW CHARTS. Results have been expressed in dB of Shielding Attenuation and in % of Attenuation.

The test results show that a Shielding Effectiveness of 40 dB provides 99.000% attenuation of the electromagnetic (EMI/RFI) radiation while a Shielding Effectiveness of 92 dB, the highest Shielding Effectiveness found in the tests, provides 99.997% attenuation. A Shielding Effectiveness of 40dB is the targeted minimum in most applications.

Very effective shielding was provided by most samples up to frequencies of 7 GHz. Above that frequency, some of the samples dropped below 99.000% effective, but most samples stayed comfortably above 95% effective even at the highest frequency level of 18GHz. The obvious conclusion to be reached is that there are many perforated patterns that designers can choose from to meet their design requirements.

The largest single source of leakage is along contact surfaces between two parts. If a tightly sealed electrical connection is not made, the leakage through the interface can be greater than through the structure.

The obvious conclusion to be reached is that there are many perforated patterns that designers can choose from to meet their design requirements.



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