AEROSPACE, DEFENSE & MARINE /// WHITE PAPER PAGE 4
Filters are also available as adapters to allow a quick retrofit for poor behaving systems. The adapter is simply a filtered
assembly with a plug on one end and a receptacle on the other. The cable is unplugged, the adapter is plugged into the
receptacle, and the cable is reconnected.
Figure 1.
TE EN4165 connectors, which are popular for passenger connectivity, are available filtered. (Source: TE
Connectivity)
The Fiber Alternative
The dielectric nature of optical fibers means they neither radiate nor receive EMI; as a medium for signal transport, they
effectively remove EMI as an issue. Designers tend to be cautious about using fiber optics because of issues of cost,
field reparability, and performance at extreme temperatures. Especially when the additional costs of shielding and filter
for copper connectivity are considered, the economics of fiber optics becomes more favorable. As a high-speed
backbone for in-flight entertainment and passenger network, fiber offers an attractive combination of high data rates and
long transmission distances.
Conclusion: Fix Now or Fix It Later
In the long run, designing for electromagnetic compatibility from the start saves headaches and unexpected costs down
the road. Don't let a penny saved today incur costs of several pennies tomorrow. While size and weight remain critical
issues in aircraft design and flight efficiency, components such as connectors and cable have become lighter and
smaller, striking a balance between the additional weight of filters or shielding.
