US 11,860,247 B2
Magnetic field generator having a high frequency current lower layer coil and a resonance upper layer coil
Yuki Anno, Kariya (JP); Takayuki Shibata, Nisshin (JP); and Kazuhiro Oyama, Nisshin (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Feb. 24, 2023, as Appl. No. 18/174,140.
Application 18/174,140 is a continuation of application No. 17/675,109, filed on Feb. 18, 2022, granted, now 11,686,785.
Claims priority of application No. 2021-026889 (JP), filed on Feb. 23, 2021.
Prior Publication US 2023/0221384 A1, Jul. 13, 2023
Int. Cl. G01R 33/032 (2006.01); H01F 7/20 (2006.01); H01F 27/28 (2006.01)
CPC G01R 33/032 (2013.01) [H01F 7/20 (2013.01); H01F 27/28 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A magnetic field generator comprising:
an upper layer coil composed of a first conductive material and forming a loop circuit having a coil portion;
a lower layer coil composed of a second conductive material and forming a loop circuit having a coil portion arranged opposite to the coil portion of the upper layer coil at a predetermined distance;
a substrate supporting the upper layer coil and the lower layer coil and having a dielectric material between the upper layer coil and the lower layer coil;
a ground layer having a ground potential arranged to sandwich the upper layer coil and the lower layer coil on one surface and an other surface of the substrate; and
a lower layer power source that supplies a high-frequency current to the lower layer coil, wherein
the upper layer coil is a resonance coil that is magnetically coupled or electrically coupled to the lower layer coil,
by supplying the high-frequency current to the lower layer coil, a high-frequency current having a phase opposite to that of the high-frequency current supplied to the lower layer coil flows through the upper layer coil, and
a length per loop of the coil portion in the upper layer coil and in the coil portion in the lower layer coil is matched to one wavelength of the high-frequency current.