Class A

UWB Device NBTC Certification

Ultra-Wideband (UWB) devices — used for precision indoor positioning, radar imaging, and asset tracking — require Class A (Registration) from the NBTC before they can be sold in Thailand. UWB operates under a spectral density power limit across a wide swath of spectrum from 1.6 GHz to 10.6 GHz.

Certification Requirements

Unlike most applications where transmit power is expressed as a single maximum figure, UWB is governed by a spectral density limit: the radiated power must not exceed −41.3 dBm/MHz eirp across the permitted band. This applies uniformly — there are no power-based certification splits. Class A registration is required in all cases.

ApplicationFrequency RangePower LimitCertificationStandard
Ultra-wideband (UWB)1,600–10,600 MHz−41.3 dBm/MHz eirp (spectral density limit)Class ANBTC TS 1034-2561
Spectral density limit explained: The −41.3 dBm/MHz figure is a power spectral density (PSD) limit, not a total power ceiling. It restricts how much power may be emitted per megahertz of bandwidth across the entire UWB span. Test reports must demonstrate compliance with this limit curve, not a single watt or milliwatt figure.

What This Covers

The UWB application covers devices that use ultra-wideband radio technology for communication, sensing, or positioning. Common product categories include:

  • Precision indoor positioning tags and anchors
  • Asset tracking systems in warehouses, hospitals, and manufacturing facilities
  • Through-wall radar imaging systems
  • Ground-penetrating radar (GPR) equipment
  • Consumer devices with UWB chips for spatial awareness (e.g., smart locks, device finding)
  • Industrial UWB ranging and sensing modules
Note on vehicle radar: Some automotive radar systems also operate in ranges that overlap the UWB band. These are certified under the separate Vehicle Radar application with different technical standards. See the Vehicle Radar page if your product is an automotive radar sensor.

Required Documents

  • Technical specification / datasheet with wireless communication details
  • Product photographs (exterior and label)
  • Test report from an accredited laboratory outside Thailand, demonstrating compliance with the −41.3 dBm/MHz eirp spectral density limit curve
  • ISO/IEC 17025 accreditation certificate and laboratory scope
  • Authorised declaration (manufacturer or authorised representative)
Class A registration requires a local representative — a Thai juristic person holding a valid NBTC trade license and NBTC Supplier Code — to file on behalf of the overseas manufacturer. Zergo provides this as part of its certification service.

Estimated Timeline

Class A Registration:Approximately 5 weeks from submission

Related Pages

Overlapping frequency range — different application
Vehicle Radar
→

Ready to certify your UWB device for Thailand?

Zergo handles the full NBTC Class A registration process for UWB devices — from verifying spectral density test report compliance to local representative filing and approval delivery.

View NBTC Certification Service →