28 April 2009 Predicted and measured EMI shielding effectiveness of a metallic mesh coating on a sapphire window over a broad frequency range
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Proceedings Volume 7302, Window and Dome Technologies and Materials XI; 73020X (2009); doi: 10.1117/12.818200
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States
Abstract
Metallic mesh thin film coatings have been used for many years to provide electromagnetic interference (EMI) shielding on infrared windows and domes. The level of EMI shielding effectiveness (SE) of metallic mesh coatings when used in a high frequency application is understood and characterized. Conversely, the level of SE of these metallic mesh coatings when used in a low frequency application has been called into question. In a recent study, we applied an appropriately designed metallic mesh coating to a sapphire window, mounted that window in a fixture, and tested the SE of the window assembly over a frequency range that envelopes the various military platforms covered in MIL-STD-461 (10 kHz to 18 GHz) for a radiated emissions test. The test plan was devised in such a way as to independently assess the individual contributions of the aperture, the mounting, and the metallic mesh coating to the total shielding. The results of our testing will be described in this paper. Additionally, the test results will be compared to the predicted SE for both the aperture and the metallic mesh coated window in order to validate the predictive model. Finally, an assessment of the appropriateness of the use of metallic mesh coatings for EMI shielding in a low and/or broad range frequency application will be made.
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Keith T. Jacoby, Matthew W. Pieratt, Jennifer I. Halman, Keith A. Ramsey, "Predicted and measured EMI shielding effectiveness of a metallic mesh coating on a sapphire window over a broad frequency range", Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 73020X (28 April 2009); doi: 10.1117/12.818200; https://doi.org/10.1117/12.818200
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KEYWORDS
Coating

Antennas

Sapphire

Electromagnetic coupling

Aluminum

Resistance

Infrared radiation

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