Electromagnetic Field Sensor Loop Plane Wide Band Detection
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Solution Overview
Problem
Existing electromagnetic field sensors face challenges in accurately measuring alternating currents over a wide band due to deformation of the sheet-like antenna, which affects the distance between the antenna and the device under test, leading to incorrect signal measurement and reduced sensitivity, especially for weak alternating currents like electromagnetic noise.
Innovation Solution
An electromagnetic field sensor comprising a conductor plate and a linear conductor forming a loop plane orthogonal to the conductor plate, allowing magnetic flux to penetrate and induce electromotive force without relying on resonance, thereby enhancing detection sensitivity across a wide band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sheet-like antenna is deformed to conform to the surface shape of the device under test, then the antenna can be positioned closer to the device surface, but the distance between the antenna and device under test changes, causing incorrect signal measurement
Solution Approach 1:
The antenna is divided into multiple independent antenna elements rather than using a single continuous sheet-like antenna. Each element can be independently positioned and oriented, allowing the array to conform to complex surfaces while maintaining consistent measurement geometry through electronic beamforming and signal processing.
Solution Approach 2:
The invention changes the operational parameters of the antenna system by using multiple discrete elements with adjustable positions and orientations. By controlling the phase and amplitude of each element independently, the system can adapt to different surface geometries while maintaining accurate signal measurement through parameter adjustment rather than physical deformation of a single antenna.
2Measurement precision
If the antenna element size is optimized for resonance at a specific frequency, then detection sensitivity is improved at that frequency, but sensitivity across a wide frequency band deteriorates
Solution Approach 1:
The antenna system uses multiple discrete antenna elements instead of a single resonant element. Each element can be designed with different dimensions and resonant frequencies, allowing the array to detect signals across a wide frequency band by activating or weighting elements according to the frequency of interest.
Solution Approach 2:
The antenna array is designed to perform multiple functions across different frequency ranges. By configuring multiple elements with varying characteristics, the system achieves universal detection capability that works effectively across a wide frequency band, eliminating the need to optimize for a single resonant frequency.
3Adaptability or versatility
If the sheet-like antenna is deformed according to the device surface shape, then the antenna can measure electromagnetic fields on complex surfaces, but the potential difference between the antenna and ground potential changes, affecting measurement accuracy
Solution Approach 1:
The antenna is segmented into multiple elements that can be independently positioned on complex surfaces. Each element maintains a known, fixed relationship to its local ground reference, allowing accurate potential difference measurement even when the overall antenna array conforms to complex surface geometries.
Solution Approach 2:
Each antenna element is designed to maintain local measurement quality by keeping a consistent relationship to the local ground potential at its position. This local quality approach ensures that even though the overall array deforms to match complex surfaces, each local measurement point maintains accuracy through proper grounding and element configuration.
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 sensor improves the detection sensitivity of alternating currents by measuring induced electromotive force without resonance, enabling accurate measurement of signals across a wide frequency range.
Implementation Method 1
the magnetic flux generated around a device under test (DUT) penetrates the loop plane and thus an induced electromotive force is generated in the loop plane
Data Source
AI summary
An electromagnetic field sensor includes a conductor plate, a signal output terminal to output a potential difference between the conductor plate and the signal output terminal, and a linear conductor including a first end electrically connected to a plate face of the conductor plate and a second end opposite to the first end and provided with a signal output terminal. The electromagnetic field sensor includes a loop plane that is formed by the conductor plate and the linear conductor and orthogonal to a plate face of the conductor plate when viewed from the side.