Parallel Plate Coil Layout for Uniform 3D Microwave Magnetic Fields
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Solution Overview
Problem
Existing high-frequency magnetic field generating devices are limited to generating a three-dimensional uniform field only in a very narrow range, leading to low detection sensitivity in measurements like Optically Detected Magnetic Resonance (ODMR) and Electron Spin Resonance.
Innovation Solution
A high-frequency magnetic field generating device comprising two identical coils arranged in parallel with a gap, connected by transmission lines that set current distribution to locate the coils at antinodes of a stationary wave, ensuring uniform magnetic field generation in a wide three-dimensional range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coil or conventional antenna is used to generate high-frequency magnetic field, then the device structure is simple, but the uniformity range of the magnetic field is very narrow
Solution Approach 1:
The patent divides the single coil structure into two separate coils arranged in parallel. Each coil is connected to the high-frequency power supply through transmission lines, creating a segmented configuration that generates a broader uniform magnetic field region while maintaining structural simplicity
Solution Approach 2:
The patent transitions from a single-plane coil configuration to a three-dimensional arrangement with two coils separated by a gap along the z-axis. This dimensional change creates a extended uniform magnetic field region in the three-dimensional space between and around the coils
2Device complexity
If coils are arranged without transmission line optimization, then the connection is simple, but the current distribution is uneven causing non-uniform magnetic field
Solution Approach 1:
The transmission lines are designed with specific electrical lengths (λ/4 or λ/2 at the operating frequency) to provide feedback control over the current distribution. This ensures that currents in both coils are synchronized and uniformly distributed, creating a stable and uniform magnetic field in the gap region
Solution Approach 2:
The patent changes the electrical parameters of the connection system by introducing transmission lines with specific impedance and electrical length characteristics. This parameter optimization ensures proper current distribution and impedance matching, resulting in uniform magnetic field generation
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
The device achieves a substantially uniform high-frequency magnetic field in a wide three-dimensional area, enhancing detection sensitivity for ODMR and other electron spin resonance measurements.
Implementation Method 1
two coils arranged with a predetermined gap in parallel with each other... configured for arranging electron spin resonance material in between or at one side from of the two coils... generates a substantially uniform high-frequency magnetic field in a wide three dimensional area
Implementation Method 2
electron spin resonance material... optically detected magnetic resonance... high-frequency magnetic field (microwave)... magnetic resonance between the sublevels
Data Source
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AI summary
A high-frequency magnetic field generating device includes a plate coil and a high-frequency power supply that generates microwave current that flows in the plate coil, wherein one edge line part in a top end side and one edge line part in a bottom end side among four edge line parts of the plate coil act as two coils arranged with a predetermined gap in parallel with each other, wherein between the two coils an electron spin resonance material is arranged or the coils are arranged at one side from an electron spin resonance material.