Governance: EMI sharing and health

[rahulrazdan][✓ rahulrazdan, 2025-06-16]

Figure 1

Another key aspect of governance is the management of shared resources. In the case of the mechanical world, this means laws and regulations in transportation in connection with traffic laws and the traffic infrastructure. In electronics, it means the management of the shared frequency spectrum and health safety issues. For shared use, in the US, the primary legal basis was the communication act passed in 1934 which created the regulator (Federal Communications Commission [FCC]). The FCC manages the radio spectrum (figure 1) through a range of regulatory and technical actions to ensure its efficient and interference-free use. It allocates specific frequency bands for various services—such as broadcasting, cellular, satellite, public safety, and amateur radio—based on national needs and international agreements. The FCC issues licenses to commercial and non-commercial users, setting terms for power limits, coverage areas, and operating conditions. It also conducts spectrum auctions to assign frequencies for commercial use, such as 5G, while reserving portions for public services and unlicensed uses like Wi-Fi.

In addition, the FCC enforces rules to prevent harmful interference, coordinates spectrum sharing and repurposing efforts, and leads initiatives like dynamic spectrum access and band reallocation to adapt to evolving technological demands. To enforce these standards, the FCC requires many devices to undergo testing and certification before they can be marketed or sold in the United States. This process is carried out by FCC-recognized testing laboratories, known as accredited Conformity Assessment Bodies (CABs), which evaluate products against applicable Part 15 or Part 18 regulations, among others. Certified devices must meet limits on emissions, immunity, and specific absorption rate (SAR) when applicable. Once a product passes testing, the lab submits a report to a Telecommunications Certification Body (TCB), which issues the FCC ID and authorizes the product for sale. These labs play a critical role in ensuring compliance, supporting innovation while maintaining spectrum integrity and public safety.

FCC Part 15 and Part 18 differ primarily in the type and purpose of radio frequency (RF) emissions they regulate. Part 15 governs devices that intentionally or unintentionally emit RF energy for communication purposes, such as Wi-Fi routers, Bluetooth devices, and computers. These devices must not cause harmful interference and must accept interference from licensed users. In contrast, Part 18 regulates Industrial, Scientific, and Medical (ISM) equipment that emits RF energy not for communication, but for performing physical functions like heating, welding, or medical treatments—examples include microwave ovens and RF diathermy machines. While both parts limit electromagnetic interference, Part 15 devices operate under stricter emissions limits due to their proximity to communication bands, whereas Part 18 devices are allowed higher emissions in designated ISM frequency bands. Additionally, health and safety regulations for Part 18 equipment are typically overseen by other agencies such as the FDA or OSHA, while the FCC focuses on interference mitigation.

Figure 2

A key instrument for electromagnetic testing is an anechoic chamber (figure 2). An anechoic chamber is a specialized, sound- and radio wave-absorbing enclosure designed to create an environment free from reflections and external interference. Its walls, ceiling, and floor are typically lined with wedge-shaped foam or ferrite tiles that absorb electromagnetic or acoustic waves, depending on the application. For radio frequency (RF) testing, the chamber is constructed with conductive materials (like steel or copper) to form a Faraday cage, isolating it from external RF signals. In acoustic chambers, sound-absorbing foam eliminates echoes and simulates free-field conditions. Anechoic chambers are critical in industries such as telecommunications, defense, aerospace, and consumer electronics, where they are used to test antenna performance, electromagnetic compatibility (EMC), emissions compliance, radar systems, or audio equipment in highly controlled, repeatable conditions. The chamber ensures that test measurements reflect only the characteristics of the device under test (DUT), without environmental interference.

All hardware in all the domains of interest (ground, airborne, marine, space) must comply with the FCC standards and in cases involving human contact, FDA standards for health and safety !

Finally, testing labs and services organizations play a critical role in certifying electronics against national and international standards, particularly for safety, electromagnetic compatibility (EMC), environmental robustness, and reliability. Global conformity assessment firms such as UL Solutions, TÜV SÜD, Intertek, and Bureau Veritas provide third-party testing and certification to standards such as IEC 61000 (EMC), IEC 62368 (product safety), ISO 26262 (automotive functional safety), DO-160 (aerospace environmental conditions), and MIL-STD-810 (defense environmental testing). These organizations operate accredited laboratories (often ISO/IEC 17025 certified) that conduct emissions and immunity testing, thermal cycling, vibration, ingress protection (IP), and safety evaluations required for CE marking, FCC authorization, automotive AEC qualification, and other regulatory approvals. In highly regulated sectors—automotive, aerospace, medical, and industrial—independent lab validation provides not only compliance evidence but also liability mitigation and market access assurance, making standards-driven testing an essential bridge between engineering validation and commercial deployment.