US 12,237,696 B2
Antenna device and wireless power transmission device having the same
Shoma Kajikiya, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK Corporation, Tokyo (JP)
Filed on Aug. 30, 2023, as Appl. No. 18/458,453.
Claims priority of application No. 2022-142165 (JP), filed on Sep. 7, 2022.
Prior Publication US 2024/0079911 A1, Mar. 7, 2024
Int. Cl. H02J 50/50 (2016.01); H01F 27/28 (2006.01); H01Q 7/00 (2006.01); H02J 50/12 (2016.01)
CPC H02J 50/502 (2020.01) [H01F 27/28 (2013.01); H01Q 7/00 (2013.01); H02J 50/12 (2016.02)] 10 Claims
OG exemplary drawing
 
1. An antenna device comprising:
a first coil wound in a plurality of turns; and
a second coil disposed outside the first coil as viewed in a coil axis direction of the first coil,
wherein the first coil is configured such that a first interval between turns in a first direction is larger than a second interval between turns in a second direction perpendicular to the first direction, and
wherein an inter-coil distance between an outer edge of the first coil and an inner edge of the second coil is larger than the second interval as viewed in the coil axis direction.