EMI SHIELD TO SUPPRESS EMI LEAKAGE FROM ONE OR MORE OPTICAL PORTS OF AN OPTICAL COMMUNICATIONS MODULE
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United States of America Patent
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Issued Date -
Mar 2, 2017
app pub date -
Aug 28, 2015
filing date -
Aug 28, 2015
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Abstract
In one exemplary embodiment, an optical communications module includes an upper housing portion mated to a lower housing portion with an optical port projecting through an opening in a front surface of the mated assembly. Electronic circuit housed inside the mated assembly can lead to electromagnetic interference (EMI) leakage through a front surface of the mated assembly, especially through the opening that accommodates the optical port. An EMI shield, which is used to address the EMI leakage, includes an annular array of resilient metal fingers that press against a metal flange of the optical port, and also includes at least two peripheral edges each incorporating an array of resilient metal fingers that press against a metal portion of the mated assembly. An interdigital spacing in the annular array and/or the array of resilient metal fingers is defined on the basis of a wavelength associated with the EMI radiation.
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