EN 301 893 — Harmonised Standard for 5 GHz Wi-Fi Radio Devices
ETSI EN 301 893 (5 GHz WAS/RLAN; Harmonised Standard for access to radio spectrum) is the harmonised European standard governing radio frequency requirements for 5 GHz RLAN (Radio Local Area Network) devices — most commonly 5 GHz Wi-Fi (IEEE 802.11a/n/ac/ax, Wi-Fi 4/5/6). It is the 5 GHz counterpart to EN 300 328 (the 2.4 GHz standard); applying it is voluntary, but it is the route to a presumption of conformity with RED Article 3(2) for 5 GHz Wi-Fi products.
Key Facts
| Detail | Information |
|---|---|
| Full title | ETSI EN 301 893 V2.2.1 — 5 GHz WAS/RLAN; Harmonised Standard for access to radio spectrum |
| Developed by | ETSI |
| Current version | V2.2.1 (2024-11), cited in the OJ since 15 May 2025; V2.1.1 (2017-05) remains cited until 15 May 2028 |
| Standard type | Harmonised European Standard (hEN) |
| Published in OJEU | Yes — presumption of conformity with RED Article 3(2) |
| Applicable directive | Radio Equipment Directive (RED, 2014/53/EU) |
| Frequency range | 5,150–5,350 MHz and 5,470–5,725 MHz; 5,725–5,850 MHz only where national rules permit (Annex B) |
| Technologies covered | Wi-Fi 802.11a/n/ac/ax (5 GHz); 6 GHz Wi-Fi 6E is covered by EN 303 687 instead |
5 GHz Band Structure in Europe
The 5 GHz spectrum is divided into bands with different maximum power levels and usage conditions in the EU:
| Sub-band | Frequency Range | Max EIRP | Indoor/Outdoor | DFS Required? |
|---|---|---|---|---|
| Sub-band 1 | 5,150–5,250 MHz | 200 mW (23 dBm) | Indoor; limited outdoor use (no fixed outdoor installations) | No |
| Sub-band 2 | 5,250–5,350 MHz | 200 mW (23 dBm) with TPC; 100 mW (20 dBm) without | Indoor only (inside buildings) | Yes |
| Sub-band 3 | 5,470–5,725 MHz | 1 W (30 dBm) with TPC; 500 mW (27 dBm) without | Indoor + outdoor | Yes (10-minute CAC on channels overlapping 5,600–5,650 MHz) |
| Sub-band 4 | 5,725–5,850 MHz | 200 mW (23 dBm) with TPC; 100 mW (20 dBm) without | Only where national rules permit | No DFS clause in Annex B |
Critical for hardware designers: 5,250–5,350 MHz is restricted to indoor use inside buildings, and 5,150–5,250 MHz to indoor and limited (non-fixed) outdoor use. These are conditions of use rather than EN 301 893 test items: the restriction must be indicated on the packaging and explained in the instructions (RED Article 10(10)).
Key Technical Requirements
1. Maximum Transmit Power (EIRP)
Power limits vary by sub-band as shown above. EN 301 893 tests the transmitter output and verifies that EIRP (including antenna gain) does not exceed the applicable limit for each sub-band the device supports.
For products with user-interchangeable antennas, the maximum EIRP across all permitted antenna configurations must be within limits.
2. Dynamic Frequency Selection (DFS)
DFS is the most technically demanding requirement of EN 301 893 — and the one that causes the most test failures and delays.
What DFS does: Protects radar systems (meteorological radars, military radars, aviation weather radars) operating in the 5,250–5,350 MHz and 5,470–5,725 MHz bands from interference by Wi-Fi devices.
How DFS works:
- Before transmitting on a radar-protected channel, the device must perform a Channel Availability Check (CAC) — listening on the channel for 60 seconds (or 10 minutes for channels overlapping 5,600–5,650 MHz) to verify no radar is present.
- During normal operation, the device must continuously monitor for radar signals. If a radar pulse sequence is detected, the device must vacate the channel within 10 seconds (Channel Move Time) and must not return to that channel for 30 minutes (Non-Occupancy Period).
- The device must recognise all ETSI-defined radar waveforms.
DFS testing is complex: it involves injecting specific radar pulse patterns (defined in ETSI EN 301 893 Annex D) and verifying the device correctly detects and vacates. Testing typically requires a specialised radar simulator at the test lab.
Hardware implication: DFS requires firmware implementation of radar detection algorithms. The radio chipset must support raw radar pulse monitoring mode during the listening period. Not all chipsets expose this capability to firmware developers — verifying DFS capability at chipset selection stage is critical.
3. Transmit Power Control (TPC)
In 5,250–5,350 MHz and 5,470–5,725 MHz, TPC must provide a mitigation factor of at least 3 dB, which means a TPC range reaching at least 6 dB below the power limit. Devices without TPC may still operate, but with EIRP and power-density limits 3 dB lower.
TPC allows more devices to share the band more efficiently. The EN 301 893 test verifies that the device correctly implements a TPC mechanism.
4. Occupied Bandwidth and Spectral Mask
For 5 GHz OFDM channels (20/40/80/160 MHz channel widths used by 802.11n/ac/ax), the spectral mask — the shape of the transmitted signal in the frequency domain — must conform to EN 301 893 requirements. Out-of-band emissions must fall within the defined mask limits.
This is particularly important for wide-channel 802.11ac/ax (80/160 MHz channels) where the occupied bandwidth approaches or crosses sub-band boundaries that have different power limits.
5. Spurious Emissions
As with EN 300 328, spurious and out-of-band emission limits are defined in EN 301 893 itself; ETSI EN 301 489 is the separate EMC standard.
EN 301 893 and Wi-Fi 6E (6 GHz)
Wi-Fi 6E extends 802.11ax into the 6 GHz band, where the EU’s harmonised range for WAS/RLAN is 5,945–6,425 MHz. In the EU, 6 GHz Wi-Fi is governed by a separate standard and regulatory framework — not EN 301 893:
- The relevant standard for 6 GHz RLAN in EU is ETSI EN 303 687 (V1.1.1, cited in the Official Journal since 15 May 2025, with restrictions)
- 6 GHz spectrum availability is set by Commission Implementing Decision (EU) 2021/1067
- Products supporting both 5 GHz (EN 301 893) and 6 GHz (EN 303 687) must comply with both standards
Complete Standard Set for 5 GHz Wi-Fi CE Marking
A complete 5 GHz Wi-Fi product is typically assessed against:
| Standard | Coverage | RED Article |
|---|---|---|
| EN 301 893 | RF spectrum, DFS, TPC, power limits | Art. 3(2) |
| EN 301 489-1 + -17 | EMC — immunity and emissions | Art. 3(1)(b) |
| EN 62368-1 | Electrical safety | Art. 3(1)(a) |
| EN 62311 | RF exposure (SAR) if worn close to body | Art. 3(1)(a) |
| EN 18031-1 | Cybersecurity (if RED Delegated Act applies) | Art. 3(3)(d) |
Common Failure Modes
Based on typical laboratory test outcomes, the most frequent EN 301 893 failures include:
| Failure | Root Cause |
|---|---|
| DFS non-detection | Firmware radar detection algorithm does not recognise all ETSI radar types; chipset DFS firmware not properly configured |
| DFS channel move time exceeded | Firmware takes >10 seconds to vacate channel after radar detection |
| EIRP limit exceeded | Antenna gain higher than certified limit; power amplifier calibration error |
| Indoor-use restriction violation | Device configured for outdoor use in 5,250–5,350 MHz, or for fixed outdoor installation in 5,150–5,250 MHz |
| Spectral mask failure | Wideband channel (80/160 MHz) emission exceeding mask at sub-band edges |
Related Terms
- EN 300 328 — The companion 2.4 GHz RLAN standard.
- RED — The directive under which EN 301 893 provides presumption of conformity.
- ETSI — The standards body that develops and maintains EN 301 893.
- CE Marking — Market access mark enabled by EN 301 893 compliance.
- EN 18031 — Cybersecurity standard applicable to connected 5 GHz Wi-Fi products under the RED Delegated Act.
DFS certification failure is one of the most common causes of delayed CE marking for 5 GHz Wi-Fi products. Inovasense designs 5 GHz radio products with DFS implementation verified at the firmware level before laboratory submission, and manages the complete EN 301 893 test coordination from antenna characterisation through accredited lab testing and technical file compilation. See our embedded wireless hardware services and EU compliance consulting.
Official References
- Implementing Decision (EU) 2022/2191 — harmonised standards for radio equipment — EUR-Lex (EN 301 893 V2.2.1 added by Implementing Decision (EU) 2025/893)