(low power for mobile devices) Magnetic 20.05-38 Meets coexistence Further assessment Meets coexistence coupling kHz conditions with the necessary for conditions (low-high power notes below: coexistence. 42-58 kHz Meets coexistence for home The 2nd and 3rd Need to derive • • conditions appliances) harmonics shall required 62-100 kHz Further assessment not fall in the separation necessary. SCRD operation distance not to Need to derive • bands. harmful required separation interference Inviting • distance not to cause attention to the harmful interference possibility of interference to the SCRDs Capacitive 425-524 N/A Meets coexistence N/A Coupling kHz conditions by (low power for reducing magnetic mobile devices) field strength by 12 dB achieved Coexistence conditions in assessment: (*1) Standard clock radio devices: WPT devices shall not cause harmful interference in simulated use cases. Separation distance of 10 m was used as a coexistence criterion. In addition to the fundamental wave • characteristics, integer harmonics was examined as well when they fall into the Standard radios operation bands. Additional measure on operation time condition is considered since WPT operation of home/office • equipment is not expected or observed less frequently in midnight when Standard clock radios receive their signals frequently. Advertisement of radio hazard from WPT for home appliances may lead to less interference to share the same spectrum as utilization time is not overlapped entirely. WPT harmonics generated fundamental waves of 20.05 kHz and 30 kHz fall into the Standard clock • radios operation spectrum. This is critical to ensure non-harmful interference. (*2) (*3) ATS and ITRS: WPT devices not cause harmful interference in the actual use cases in operation. The criteria for coexistence are: WPT frequency band should not be overlapped with those used for the train signalling communication • systems including ATS, or The separation distance to the ATS/ITRS devices, in which a WPT device does not cause harmful • interference, should be less than the most critical threshold (approx. 1.5 m) specified in the train systems building standards. Above shall be met with all types of railways building layout in Japan. • (B) Coexistence study with AM broadcast and Maritime radio devices WPT for mobile and Incumbent systems home appliances
(low power for mobile devices) Magnetic coupling (low-high power for home appliances) 20.05-38 kHz Meets coexistence conditions with the notes below: • The 2nd and 3rd harmonics shall not fall in the SCRD operation bands. • Inviting attention to the possibility of interference to the SCRDs Further assessment necessary for coexistence. • Need to derive required separation distance not to harmful interference Meets coexistence conditions 42-58 kHz Meets coexistence conditions 62-100 kHz Further assessment necessary. • Need to derive required separation distance not to cause harmful interference Capacitive Coupling (low power for mobile devices) 425-524 kHz N/A Meets coexistence conditions by reducing magnetic field strength by 12 dB achieved N/A Coexistence conditions in assessment: (*1) Standard clock radio devices: WPT devices shall not cause harmful interference in simulated use cases. • Separation distance of 10 m was used as a coexistence criterion. In addition to the fundamental wave characteristics, integer harmonics was examined as well when they fall into the Standard radios operation bands. • Additional measure on operation time condition is considered since WPT operation of home/office equipment is not expected or observed less frequently in midnight when Standard clock radios receive their signals frequently. Advertisement of radio hazard from WPT for home appliances may lead to less interference to share the same spectrum as utilization time is not overlapped entirely. • WPT harmonics generated fundamental waves of 20.05 kHz and 30 kHz fall into the Standard clock radios operation spectrum. This is critical to ensure non-harmful interference. (*2) (*3) ATS and ITRS: WPT devices not cause harmful interference in the actual use cases in operation. The criteria for coexistence are: • WPT frequency band should not be overlapped with those used for the train signalling communication systems including ATS, or • The separation distance to the ATS/ITRS devices, in which a WPT device does not cause harmful interference, should be less than the most critical threshold (approx. 1.5 m) specified in the train systems building standards. • Above shall be met with all types of railways building layout in Japan. (B) Coexistence study with AM broadcast and Maritime radio devices WPT for mobile and home appliances Incumbent systems