ARIB STD-T111

ARIB STD-T111 defines the technical requirements for 79 GHz band high-resolution radar operating across the 77.0–81.0 GHz band in Japan. Equipment is classified as a Specified Low Power Radio Station under the Radio Law and must meet transmitter limits, → Occupied Bandwidth, antenna parameters, → Spurious Emission limits, and marking rules.

Scope and Application

The standard covers advanced automotive and roadside radar use cases, including forward object detection, ADAS functions, intersection-turning assistance, and pedestrian/cyclist detection, as well as roadside sensing in intelligent transport systems.

Frequency Range and Channelization

• Center frequency: 79.0 GHz

• Operational band: 77.0–81.0 GHz (expanded by a 2017 revision)

Power Limits and Emission Requirements

• Antenna power (→ EIRP), average: ≤ 10 mW

• If occupied bandwidth ≤ 2 GHz: average power in any 1 MHz ≤ 5 µW

• Occupied bandwidth (max): ≤ 4 GHz

• Antenna absolute gain: ≤ 35 dBi

• Unwanted emissions (per 1 MHz):
  – Out-of-band domain: ≤ 100 µW
  – Spurious domain: ≤ 50 µW

• Measurement reference: Unwanted-emission compliance per TELEC-T319 (as referenced by the standard)

Certification and Labeling

Devices require Technical Regulations Conformity Certification by a Registered Certification Body (RCB) and must bear the Giteki marking with the assigned certification number. Electronic labeling may be used where permitted by MIC (subject to applicable conditions).

For support with testing and approval, see our → MIC Certification Services.

Note
A comprehensive overview of device categories, certification process, and Giteki marking can be found in the guide → MIC Requirements – Overview.

Notes and Special Considerations

• Interference-prevention function: The radar shall be capable of discriminating its own reflections from other stations’ transmissions.

• Regulatory update: The 77–81 GHz operational span reflects the 2017 expansion aligned with MIC notices.