EU RED Draft Mandates sub-THz EMC Immunity for 6G Massive MIMO Base Stations

On May 11, 2026, the European Union’s Radio Equipment Directive (RED) Harmonised Standards Working Group published draft standard EN 303 645 v3.2.0 — the first to require electromagnetic compatibility (EMC) immunity testing in the sub-terahertz (0.1–0.3 THz) frequency band for 6G Massive MIMO base stations placed on the EU market. This development directly impacts manufacturers of 6G radio infrastructure, especially those exporting from China, and signals a tightening of technical compliance requirements ahead of formal adoption in Q4 2026.

Event Overview

On May 11, 2026, the RED coordination standards working group released EN 303 645 v3.2.0 as a draft. It introduces mandatory EMC immunity testing in the 0.1–0.3 THz range for 6G Massive MIMO base stations under the EU’s Radio Equipment Directive. The draft is scheduled for formal adoption in Q4 2026. Testing must be conducted at laboratories accredited to ISO/IEC 17025. Globally, only seven laboratories currently hold this capability; three are located in China (Shenzhen, Shanghai, Chengdu).

Industries Affected by the New Requirement

Base Station Equipment Manufacturers (especially exporters to the EU)

Manufacturers producing 6G Massive MIMO base stations for EU export will face new conformity assessment obligations. Compliance is no longer limited to traditional RF and low-frequency EMC bands — sub-THz immunity verification becomes a mandatory step before CE marking. Failure to meet this requirement will block market access.

EMC Test Service Providers & Accredited Laboratories

Laboratories with ISO/IEC 17025 accreditation for sub-THz EMC immunity testing gain differentiated capacity. With only seven globally qualified labs — and three in China — demand for validated test slots is expected to rise sharply ahead of Q4 2026. Capacity constraints may lead to scheduling delays or premium pricing for early adopters.

Supply Chain Integrators & System Certification Consultants

Companies supporting EU market entry for telecom hardware — including conformity assessment bodies, notified bodies, and certification consultants — must update technical documentation review protocols. Sub-THz test reports, lab accreditation scope verification, and traceability of measurement uncertainty will become essential elements in CE declaration packages.

Key Considerations and Recommended Actions for Stakeholders

Monitor official timelines and final standard publication

Track updates from ETSI and the European Commission regarding the final version of EN 303 645 v3.2.0 and its incorporation into the Official Journal of the EU. The transition period between draft adoption and enforceability remains undefined — stakeholders should treat Q4 2026 as a provisional deadline until formal notice is issued.

Verify laboratory accreditation scope before scheduling tests

Confirm that selected ISO/IEC 17025-accredited labs explicitly list sub-THz (0.1–0.3 THz) EMC immunity testing within their scope of accreditation — not just general THz capability. Only three labs in China (Shenzhen, Shanghai, Chengdu) are confirmed to meet this criterion; unverified facilities may produce non-accepted results.

Review product design and test planning for sub-THz vulnerability points

Assess whether current 6G Massive MIMO base station architectures — particularly front-end modules, antenna arrays, and power management units — have been evaluated for coupling or resonance effects in the 0.1–0.3 THz band. Early internal screening (e.g., via simulation or pre-compliance bench testing) can identify redesign needs prior to formal lab validation.

Update technical documentation and EU declaration of conformity templates

Prepare to include sub-THz EMC immunity test reports, lab accreditation certificates, and uncertainty budgets in technical files. Align internal CE documentation workflows with updated RED Annex IV requirements — especially where harmonised standards reference is used to presume conformity.

Editorial Observation / Industry Perspective

Observably, this draft represents an early-stage regulatory signal rather than an immediately enforceable requirement. Its inclusion in EN 303 645 — a key RED harmonised standard — indicates the EU’s intent to future-proof spectrum governance for 6G infrastructure well ahead of commercial deployment. Analysis shows the move prioritises system resilience over theoretical bandwidth expansion, reflecting growing concern about coexistence in ultra-high-frequency environments. From an industry perspective, it is better understood as a preparatory milestone: while enforcement is still months away, the narrow global pool of qualified labs and absence of established test methodologies suggest implementation challenges remain unresolved. Continued monitoring of ETSI working group outputs and national notified body guidance will be critical through 2026.

This update underscores how regulatory frameworks are evolving in parallel with — and sometimes ahead of — technological readiness. For manufacturers and service providers, the immediate significance lies not in compliance urgency, but in strategic preparation: aligning R&D, testing, and certification roadmaps with emerging sub-THz expectations. It is more accurately interpreted as a forward-looking alignment step than a near-term compliance barrier.

Source: ETSI RED Harmonised Standards Working Group, draft EN 303 645 v3.2.0 (published May 11, 2026).
Note: Final publication date, transitional provisions, and formal OJEU listing remain pending confirmation and are subject to ongoing observation.