The Ministry of Internal Affairs and Communications (MIC) of Japan provided updates to the technical requirements for millimeter wave radar and sensor systems in the 57 - 66 GHz band.
The outline of the changes are as follows:
| Name | Milliwave Radar/Sensor System | |
|---|---|---|
| Frequency Allocation | 57 GHz ~ 64 GHz | 57 GHz ~ 66 GHz |
| Antenna Power | 10mW or less (Peak) | 250mW or less (Peak or Average) |
| Occupied Bandwidth | 7 GHz | 9 GHz |
| Allowable Deviation of Antenna Power | Max 50%, Min 70% | |
| Antenna Gain | - | 10dBi or more |
| EIRP | 13dBm or less | 40dBm or less |
| Allowable Deviation of Frequency | Depends on Designation Frequency | ±20ppm or depends on Designation Frequency. (±500 ppm or depends on Designation Frequency in case of 10mW or less only.) |
| Unwanted Emission Strength | Appendix 1 | Appendix 2 |
| Secondary Radiated Emission Strength | Appendix 3 | |
| Modulation Type | Frequency Modulated Continuous Wave except Frequency Modulated Continuous Wave | - |
| Housing Requirements | Both high-frequency portion and the modulation unit shall not be capable of being opened easily. Further, in the case where the highfrequency portion and the modulation unit are separated, oneness of them shall be kept and each of them shall not be capable of being opened easily | - |
| Transmission Time Control | Duty 10%, in 33msec cycle | |
| Crosstalk Preventing Function | By identifying the modulation type and other characteristics of the received radio wave, the radio equipment should have capacity to distinguish between the reflected radio wave that is transmitted by the local station and the radio wave that is transmitted by other station. | - |
| Others | Have a means that terminate the transmission of radio wave. | Transmitter is required a carrier sense function. |
Spurious Emissions:
| Limit Value (Peak) | Remarks | |
|---|---|---|
| 55.62GHz or less | -30dBm/MHz | Spurious |
| 55.62GHz - 57GHz | -26dBm/MHz | Outband |
| 66GHz - 67.5GHz | -26dBm/MHz | Outband |
| Over 67.5GHz | -30dBm/MHz | Spurious |
Receiver Spurious Emissions:
| Limit Value (Average) | |
|---|---|
| Below 1GHz | Average power should be 4nW or less in any 100kHz bandwidth |
| 1GHz or more | Average power should be 20nW or less in any 1MHz bandwidth |
These changes have been in effect as of January 30, 2020.