ARIB STD-T48

ARIB STD-T48 defines the technical requirements for millimeter-wave radar equipment operating in the 60.0–61.0 GHz and 76.0–77.0 GHz bands in Japan. The equipment is classified as a Specified Low Power Radio Station under the Radio Law and must meet transmitter limits, occupied bandwidth, antenna parameters, emission limits, and marking rules.

Scope and Application

The standard covers short-range, low-power radar used for basic detection tasks in industrial and vehicular contexts, including proximity/presence sensing, object detection, level measurement, and simple anti-collision systems.

Frequency Range and Channelization

Designated frequencies & bands:

• 60.5 GHz → 60.0–61.0 GHz

• 76.5 GHz → 76.0–77.0 GHz

The 60.5 GHz and 76.5 GHz values are designated (mid-band) reference frequencies, not separate allocations.

Power Limits and Emission Requirements

• Antenna power (EIRP): ≤ 10 mW

• Occupied bandwidth (max): ≤ 500 MHz (60 GHz band) and ≤ 1 GHz (76 GHz band)

• Antenna absolute gain: ≤ 40 dB

• Spurious emissions (post-Dec 1, 2005 limits):

  • Out-of-band domain: mean power ≤ 100 µW

  • Spurious domain: mean power ≤ 50 µW (per frequency)

• Measurement references: Methods per MIC Notification No. 88 (and subsequent updates) apply unless otherwise specified

Certification and Labeling

Devices are subject to Technical Regulations Conformity Certification by a Registered Certification Body (RCB) and must bear the Giteki marking with the assigned certification number. The standard explicitly references marking requirements for certified equipment.

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: Equipment must be able to distinguish its own reflections from other stations’ transmissions (e.g., by identifying modulation or signal characteristics).

• No mandatory MAC-layer sharing: Transmission-time control equipment is not required; carrier-sense is not required.

• Duty control in practice: The transmitter shall stop transmission when not measuring.