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 Outline of Proposed Amendment to Ministerial Ordinance 
 
１ Item 
Partial amendment of Regulations for Enforcement of the Radio Law, etc. 
 
２ Scope of the amendment to ministerial ordinance 
- Regulations for Enforcement of the Radio Law 
- Regulations for Radio Equipment  
- Concerning Technical Regulations Conformity Certification of SpecifiedRadio 
Equipment 
- Notices related 
 
３ Reasons for amendment 
Recently, the application of the Ultra Wide Band (UWB) Radio system to the 
sensor network has been attracting attention, and demand for outdoor use, which 
assumed to be mounted on mobile terminals in Japan is increasing. Against this 
backdrop, Japan institutionalized the system to enable outdoor use of some 
frequency bands (between 7.587 GHz and 8.4 GHz) in May 2019.  
The amendment is a revision of the technical standards to expand the frequency 
band available for outdoor use, in view of alignment with regulations of other 
countries, and in response to expansion of UWB uses, and the need for use in radar 
applications utilizing broadband.   
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 ４ Outline of the amendment 
Technical requirements of UWB radio system outside 
Item Technical requirements 
Frequency Allocation 7.25GHz-9.0GHz 
Antenna Power（Average） -41.3 dBm/MHz（EIRP）or less 
Antenna Power（Peak） 0 dBm / 50 MHz（EIRP）or less 
Occupied Bandwidth 1.75GHz 
Spreading Bandwidth 450 MHz or more 
（Bandwidth between the upper and lower 
frequencies for 10 dB down） 
Crosstalk Prevention Function Automatically send or receive a code (identification 
code) to identify receiver/sender ( For data 
transmission) 
or 
By identifying the modulation method and other 
characteristics of the received radio waves, it is 
possible to distinguish between the reflected wave of 
the radio wave transmitted by oneself and by others 
(for radio localization). 
 
Function to stop the emission of radio waves（Not 
required when using only radio waves with a 
frequency of 7.587 to 8.4 GHz）. 
Unwanted Emission Strength Appendix 1 
Secondary Radiated Emission 
Strength of receiving device Appendix 2 
Operational restrictions Prohibition of use in the sky. 
Housing requirements The housing case shall not be capable of being opened 
easily. 
 
   
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 Appendix 1（Unwanted Emission Strength） 
Frequency Limit value (Average) Limit value (Peak) 
 under 1,600MHz  -90dBm/MHz -84dBm/MHz 
1,600MHz or more – under 2,700MHz -85dBm/MHz -79dBm/MHz 
2,700MHz or more – under 7.25GHz -70dBm/MHz -64dBm/MHz 
7.25GHz or more – under 9.0GHz -59.3dBm/MHz -35dBm/MHz 
9.0GHz or more – under 10.25GHz -60dBm/MHz -35.7dBm/MHz 
10.25GHz or more – under 10.6GHz -70dBm/MHz -64dBm/MHz 
10.6GHz or more – under 10.7GHz -85dBm/MHz -79dBm/MHz 
10.7GHz or more – under 11.7GHz -70dBm/MHz -64dBm/MHz 
11.7GHz or more – under 12.75GHz -85dBm/MHz -79dBm/MHz 
12.75GHz or more -70dBm/MHz -64dBm/MHz 
  
Appendix 2（Secondary Radiated Emission Strength of receiving device） 
Frequency Limit value (Average) 
 under 1,600MHz  -90.0 dBm/MHz 
1,600MHz or more – under 2,700MHz -85.0 dBm/MHz 
2,700MHz or more – under 7.25GHz -70.0 dBm/MHz 
7.25GHz or more – under 9.0GHz -54.0 dBm/MHz 
9.0GHz or more – under 10.25GHz -60.0 dBm/MHz 
10.25GHz or more – under 10.6GHz -70.0 dBm/MHz 
10.6GHz or more – under 10.7GHz -85.0 dBm/MHz 
10.7GHz or more – under 11.7GHz -70.0 dBm/MHz 
11.7GHz or more – under 12.75GHz -85.0 dBm/MHz 
12.75GHz or more -70.0 dBm/MHz 
 
５ Proposed date of entry into force 
June, 2021