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COPING WITH COMPLEX RFI/EMI ENVIRONMENTS

RFI/EMI shielding is essential – most defense-related environments remain electromagnetically complex and hazardous. High-power transmitters, close equipment spacing, mobile platforms, and ad-hoc deployments all contribute to elevated RFI/EMI risk.

And non-combat does not mean low-EMI/RFI. Any peacekeeping, stabilization or humanitarian and disaster relief (HADR) deployment that uses modern electronics in confined, unregulated or multi-system environments should be treated as a high-risk scenario and the right shielding should be specified accordingly. In theory, civil contingency operations are ‘medium EMI/RFI risk’ but that is still no reason for complacency.

Marine platforms are notoriously vulnerable to EMI/RFI; ships are dense metal environments that promote reflection and coupling of electromagnetic energy. Vessels carry radar, automatic identification, sonar, satellite and navigation systems – all transmitting simultaneously. Small patrol boats and unmanned surface vessels (USVs) are highly susceptible because their systems are tightly packed. Furthermore, salt water and humidity affect conductivity and grounding, complicating RFI/EMI management.

Aviation is equally high risk for EMI/RFI because aircraft are full of high-power transmitters, sensitive receivers and complex power systems, all confined within a small physical space: radar, transponders, VHF/UHF/satellite communications, Instrument Landing System (ILS), GPS, VHF Omnidirectional Range (VOR) and Distance Measuring Equipment (DME) navigational technology, and cabin Wi-Fi.

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