Multilayer PCB Electromagnetic Sensor for Magnetic Nanoparticle Detection
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Solution Overview
Problem
Existing magnetic sensing systems for detecting magnetic nanoparticles are bulky, costly, and lack sensitivity, making them inefficient for portable and cost-effective detection with a wide dynamic range.
Innovation Solution
A portable electromagnetic sensing device with a multilayer PCB structure, featuring superimposed coil layers and microfluidic reservoirs, uses alternating magnetic fields to detect magnetic nanoparticles by frequency mixing, allowing for simultaneous gradiometric measurements and reducing the amount of analyte required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional magnetic sensing systems are used, then detection capability is achieved, but the systems are bulky, costly, and lack sensitivity
Solution Approach 1:
The patent transitions from traditional three-dimensional coil assemblies to a planar multilayer PCB structure. The magnetic coils are arranged in multiple layers on a printed circuit board, transforming the spatial configuration from volumetric to planar. This dimensional change reduces the overall device footprint while maintaining the necessary magnetic field generation and detection capabilities through optimized coil geometry and layer stacking.
Solution Approach 2:
The patent replaces traditional mechanical coil assemblies with PCB-integrated magnetic coils. Instead of using separate mechanical components for coil winding and assembly, the magnetic coils are directly fabricated on the PCB substrate using standard PCB manufacturing techniques. This substitution eliminates complex mechanical assembly processes and reduces device bulkiness while maintaining electrical and magnetic functionality.
2Measurement precision
If traditional magnetic sensing systems are used, then detection is achieved, but they are costly
Solution Approach 1:
The patent replaces expensive mechanical coil assemblies with PCB-fabricated magnetic coils. The coils are created using standard PCB manufacturing processes such as copper trace deposition and etching, which are significantly cheaper than traditional wire-winding and mechanical assembly methods. This substitution maintains detection sensitivity while dramatically reducing manufacturing costs and improving scalability.
Solution Approach 2:
The patent optimizes the electrical and geometric parameters of the PCB coils to achieve high detection sensitivity. By carefully selecting coil trace width, trace spacing, number of turns, and coil dimensions, the design achieves optimal magnetic field strength and detection capability. These parameter optimizations allow the use of inexpensive PCB materials while maintaining performance comparable to or exceeding traditional systems.
3Measurement precision
If high detection sensitivity is achieved, then low limit of detection is obtained, but device complexity increases
Solution Approach 1:
The patent achieves high detection sensitivity by utilizing a multilayer PCB structure where magnetic coils are arranged in multiple closely-spaced layers. This three-dimensional coil configuration within a planar format creates strong magnetic fields and enhances signal detection capability. The close proximity of coils in different layers improves the limit of detection while the integrated PCB structure prevents complexity increase by maintaining a compact, unified design.
Solution Approach 2:
The patent combines multiple functional elements into a single integrated PCB structure. The magnetic coils, detection circuits, and signal processing components are all integrated onto the same PCB substrate. This merging of functions reduces the number of separate components and interconnections, thereby reducing device complexity while achieving high detection sensitivity through the coordinated operation of integrated elements.
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 high detection sensitivity with a low limit of detection (LOD) of 15 μg/mL for 20 nm core-sized nanoparticles, is cost-effective, and provides linear output over three orders of magnitude, enabling efficient and accurate analysis of small sample volumes.
Implementation Method 1
uses alternating magnetic fields to detect magnetic nanoparticles by frequency mixing
Implementation Method 2
at least one first excitation magnetic coil configured to subject the reference microfluidic reservoir to an alternating magnetic field at a first frequency
Data Source
AI summary
An electromagnetic sensing device comprising: a reference microfluidic reservoir to receive a reference substance with magnetic nanoparticles; an analyte microfluidic reservoir to receive an analyte and magnetic nanoparticles; a first excitation magnetic coil to subject the reference microfluidic reservoir to an alternating magnetic field at a first frequency; a second excitation magnetic coil to subject the analyte microfluidic reservoir to an alternating magnetic field at the first frequency; a third excitation magnetic coil to subject the reference microfluidic reservoir to an alternating magnetic field at a second frequency distinct from the first frequency; a fourth excitation magnetic coil to subject the analyte microfluidic reservoir to an alternating magnetic field at the second frequency; a first detection magnetic coil to detect a response magnetic field of the magnetic nanoparticles in the reference microfluidic reservoir; a second detection magnetic coil to detect a response magnetic field of the magnetic nanoparticles.