Magnetic field generator and magnetic sensor having the same

A magnetic sensor comprising:

• a magnetic field generator including:
• 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 and including
• (i) a top ground layer portion located on a top surface of the substrate, and
• (ii) a bottom ground layer portion located on a bottom surface of the substrate, such that the upper layer coil and the lower layer coil are sandwiched between the top ground layer portion and the bottom ground layer portion;
• an upper layer power source that supplies a high-frequency current to the upper layer coil;
• and
• a lower layer power source that supplies a high-frequency current having a phase opposite to that of the high-frequency current supplied to the upper layer coil, wherein
• high-frequency currents of opposite phases are passed through the upper layer coil and the lower layer coil, respectively, 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,
• wherein
• the substrate has a through hole piercing a front and a back surface thereof and passing through an inside of the coil portion of the upper layer coil and the lower layer coil, and
• a magnetic field measuring element is arranged in the through hole and measures an external magnetic field, and
• a light source irradiates the magnetic field measuring element with a light of specific wavelength.

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;
• and
• a ground layer having a ground potential and including (i) a top ground layer portion located on a top surface of the substrate, and (ii) a bottom ground layer portion located on a bottom surface of the substrate, such that the upper layer coil and the lower layer coil are sandwiched between the top ground layer portion and the bottom ground layer portion, wherein
• high-frequency currents of opposite phases are passed through the upper layer coil and the lower layer coil, respectively, 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.