US 12,137,544 B2
Wave absorber
Katsunori Mutou, Aichi (JP); Sachiko Nakao, Aichi (JP); and Hideki Hayashi, Osaka (JP)
Assigned to SEKISUI CHEMICAL CO., LTD., Osaka (JP)
Appl. No. 17/413,739
Filed by SEKISUI CHEMICAL CO., LTD., Osaka (JP)
PCT Filed Dec. 25, 2019, PCT No. PCT/JP2019/050884
§ 371(c)(1), (2) Date Jun. 14, 2021,
PCT Pub. No. WO2020/138194, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-241069 (JP), filed on Dec. 25, 2018; and application No. 2018-241074 (JP), filed on Dec. 25, 2018.
Prior Publication US 2022/0071071 A1, Mar. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H05K 9/00 (2006.01); H01Q 17/00 (2006.01)
CPC H05K 9/0088 (2013.01) [H01Q 17/00 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A radio wave absorber having
characteristic A: an absorption range with absorption performance of 15 dB or more within the frequency band of 75 to 85 GHz with a bandwidth of 4 GHz or more in a transverse magnetic (TM) polarization measurement at 45° incidence, and/or
characteristic B: an absorption range with absorption performance of 15 dB or more within the frequency band of 75 to 85 GHz with a bandwidth of 4 GHz or more in a transverse electric (TE) polarization measurement at 45° incidence,
wherein when the radio wave absorber has characteristic A, the radio wave absorber has
an absorption range with absorption performance of 10 dB or more within the frequency band of 75 to 85 GHz with a bandwidth of 2 GHz or more in a TM polarization measurement at 20° incidence, and
an absorption range with absorption performance of 10 dB or more within the frequency band of 75 to 85 GHz with a bandwidth of 2 GHz or more in a TM polarization measurement at 60° incidence,
wherein when the radio wave absorber has characteristic B, the radio wave absorber has
an absorption range with absorption performance of 10 dB or more within the frequency band of 75 to 85 GHz with a bandwidth of 4 GHz or more in a TE polarization measurement at 20° incidence, and
an absorption range with absorption performance of 10 dB or more within the frequency band of 75 to 85 GHz with a bandwidth of 4 GHz or more in a TE polarization measurement at 60° incidence.