ETSI EN 300 328
ETSI EN 300 328 is a harmonized European standard developed by ETSI. It specifies the technical requirements for wideband data transmission equipment operating in the 2.4 GHz ISM band (2400–2483.5 MHz) using modulation techniques such as Wi-Fi, Bluetooth, Zigbee, and other short-range radio systems.
Scope and Application
The standard applies to a broad range of wireless technologies, including:
Wi-Fi access points and routers
Bluetooth audio and wearable devices
Zigbee and industrial IoT equipment
Smart home and automation systems
Automotive and medical applications operating in the 2.4 GHz band
Devices tested according to EN 300 328 are presumed to comply with Article 3.2 of the Radio Equipment Directive (RED) 2014/53/EU, which requires the efficient use of the radio spectrum.
Key Technical Requirements
The standard defines requirements for:
Transmit power: maximum 20 dBm EIRP
Power spectral density: band-specific limits
Dwell time and duty cycle: usage restrictions for channel access
Adaptivity mechanisms: such as Listen Before Talk (LBT)
Receiver blocking and spurious emissions limits
Coexistence performance in shared spectrum environments
These parameters ensure fair and interference-resistant use of the ISM band.
Certification and Compliance
Compliance with EN 300 328 enables:
Use of Module A (Internal Production Control) without a Notified Body
Reference in the EU Declaration of Conformity (DoC)
Presumption of conformity, if the version is published in the Official Journal of the European Union (OJEU)
As of April 2025, the applicable version is EN 300 328 V2.2.2, published in July 2019 and cited in the OJEU since August 6, 2021.
Lifecycle Relevance
Manufacturers must ensure ongoing conformity by:
Monitoring changes to harmonized standards or legal requirements
Updating documentation if product changes affect RF behavior
Reassessing compliance when firmware, software, or design is modified
EN 300 328 compliance must be maintained across the full product lifecycle, not just at initial market placement.
Relation to Other Standards
EN 301 489-1: Electromagnetic compatibility (EMC) for radio devices
EN IEC 62368-1: Electrical safety for AV/ICT equipment
Harmonized Standard: General concept under the EU New Legislative Framework
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Further Reading & Official Resources
Official ETSI Standard (PDF)
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EN 300 328 V2.2.2 – Wideband transmission systems operating in the 2.4 GHz band
This is a curated selection of key sources. For full and up-to-date regulatory documentation, please refer to the official portals of the relevant authorities. All references were verified as of April 2025.