Interconnection


Cable and connector EMI shielding

14 May 2008 Interconnection

Higher speeds, mixed signals and digital bursts make for a noisy electrical environment.

These combinations of electric and magnetic fields perpendicular to each other are often hard to control. Unmatched impedance in an interconnect system can generate an EMI wave that couples from cable to cable to component to element, substantially degrading the performance of an electronic device.

Noise management methods normally include one or more of the following:

* Shielding.

* Grounding.

* Balancing.

* Filtering.

* Isolation.

* Separation and orientation.

* Impedance level control.

* Cable design.

* Cancellation in the frequency or time domain.

Nano-miniature cable and connectors fit into small noisy places but become highly susceptible, due to close proximity and thin cable jackets. To solve this problem, Omnetics offers a wide range of shielding and noise protection schemes. The new slim-lined 0,635 mm pitch connectors with integrated back-shells save weight and space while managing up to 85 db of EMI isolation in noisy, high speed environments.

Braided shields offer the highest isolation, but a number of options offer smart trade-offs when they can be used. Conductive zipper or shrink sleeving should be considered, with flat cable EMI tape and knitted mesh shield wrapping to help with cable-flex, although with some loss in isolation strength. A new tubular metallised-fibre braid offers light weight and excellent flex and isolation, but at higher prices.



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