Layered Resonance Coil Layout for XY-Plane Magnetic Field Sensing
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Solution Overview
Problem
Existing magnetic field generators, such as loop gap resonators, face limitations in detecting small external magnetic fields due to their lack of sensitivity in the axial direction and structural constraints that limit the proximity of the sensor to the source, making it difficult to generate high-frequency magnetic fields in the XY plane.
Innovation Solution
A magnetic field generator configuration featuring overlapping upper and lower layer coils on a substrate, with a phase difference of 180° between the high-frequency currents in the coils, generating a high-frequency magnetic field in the XY plane, allowing for improved sensitivity and closer proximity of the measurement target to the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a loop gap resonator is used as a magnetic field generator, then a high-frequency magnetic field can be generated in the axial direction, but the sensor cannot detect external magnetic fields in the axial direction due to lack of sensitivity
Solution Approach 1:
The patent transitions from generating magnetic fields primarily in the axial direction (Z-axis) to generating magnetic fields in the radial direction (XY plane). This dimensional change allows the sensor to detect external magnetic fields by placing the measurement target above or below the substrate, thereby resolving the contradiction between maintaining axial magnetic field generation capability and achieving axial sensitivity for detection.
2Measurement precision
If the measurement target is placed closer to the cylindrical resonator to detect small external magnetic fields, then detection sensitivity improves, but the structural layout on the XY plane limits how close the target can be positioned
Solution Approach 1:
The patent moves the measurement target from the XY plane layout constraints to positions above or below the substrate in the axial direction. This allows the target to be placed at distances of 1 mm or less from the substrate surface, achieving high detection sensitivity without being constrained by the XY plane structural layout.
3Length of moving object
If the measurement target is placed directly above or below the cylindrical resonator to achieve closer proximity, then distance is reduced, but the external magnetic field cannot be measured due to lack of axial sensitivity
Solution Approach 1:
The patent changes the magnetic field generation direction from axial (Z-axis) to radial (XY plane), which enables the sensor to detect external magnetic fields when the measurement target is positioned above or below the substrate. This resolves the contradiction by allowing close proximity positioning while maintaining detection capability.
4Device complexity
If a conventional loop gap resonator structure is used, then the magnetic field generation mechanism is simple, but the magnetic field is generated in a path that limits sensitivity in the axial direction
Solution Approach 1:
The patent modifies the magnetic field generation approach by creating a magnetic field in the radial direction (XY plane) rather than the axial direction (Z-axis). This is achieved by positioning conductors above and below the substrate and applying potentials to generate a magnetic field that extends in the radial direction, thereby enabling axial sensitivity for detection while maintaining structural simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables accurate measurement of small external magnetic fields by generating a high-frequency magnetic field with the magnetic field direction aligned in the XY plane, enhancing sensitivity and allowing for closer proximity of the measurement target, thus improving detection accuracy.
Implementation Method 1
upper layer coil 20 and lower layer coil 30 that respectively supply a high-frequency current... generating a high-frequency magnetic field in an XY plane
Data Source
AI summary
A magnetic field generator includes: an upper layer resonance 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; and 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 high-frequency current is supplied to the lower layer coil and 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. A length per loop of the coil portion in the upper layer coil and the coil portion in the lower layer coil is matched to one wavelength of the high-frequency current.