Ferrite-Loaded Half-Loop Antennas for Grain Bin EM Imaging
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Solution Overview
Problem
Existing shielded half-loop antennas used in electromagnetic imaging of grain bins have high S11 parameters, leading to low signal-to-noise ratios and poor inversion results due to poor antenna impedance mismatch and the absence of matching circuitry, which affects the accuracy of moisture content measurement in grain storage containers.
Innovation Solution
Employing ferrite-loaded, shielded half-loop antennas with a base portion of ferrite material and a central gap in the shielding, which improves impedance matching and reduces resonance frequency, enhancing the signal-to-noise ratio and maintaining wide band operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional shielded half-loop antennas are used, then the antenna structure is simple and easy to manufacture, but the S11 parameter is high causing poor impedance matching and low signal-to-noise ratio
Solution Approach 1:
The patent applies composite materials by integrating ferrite material with the shielded half-loop antenna structure. The ferrite-loaded antenna combines the conductive shielding material with ferrite magnetic material to achieve both impedance matching and noise reduction, resolving the contradiction between simple structure and high reliability
Solution Approach 2:
The patent changes the electromagnetic parameters of the antenna by introducing ferrite material with specific permeability and permittivity values. This parameter change improves the S11 parameter and impedance matching while maintaining the fundamental half-loop structure, achieving better signal-to-noise ratio without excessive complexity
2Measurement precision
If ferrite-loaded shielded half-loop antennas are used, then the signal-to-noise ratio is improved, but the antenna design and manufacturing becomes more complex
Solution Approach 1:
The ferrite-loaded antenna uses composite materials (ferrite + shielding material) to improve measurement precision through better impedance matching and reduced reflections, while the modular design approach keeps manufacturing feasible by treating the ferrite loading as a separate component that can be integrated into the existing antenna structure
3Use of energy by moving object
If high S11 parameter antennas are used, then the antenna structure is simpler, but the signal reflection is high reducing the strength of signals reaching the material
Solution Approach 1:
The patent changes the electromagnetic parameters of the antenna system by introducing ferrite material with specific permeability (μr) and permittivity (εr) values. This parameter change reduces signal reflection and improves transmission efficiency into the grain material, while the implementation maintains structural simplicity through the half-loop configuration
Solution Approach 2:
The composite structure of ferrite material combined with shielding material creates an antenna that efficiently transmits signals into the grain while minimizing reflections. The ferrite's magnetic properties enhance the coupling with the dielectric grain material, improving energy transfer without requiring complex multi-element structures
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 ferrite-loaded antennas provide improved signal-to-noise ratios and more accurate moisture content measurements in grain bins by reducing signal reflection and increasing the strength of signals reaching the material, thereby improving the imaging process.
Implementation Method 1
each antenna of the plurality of antennas comprises a ferrite loaded, shielded half-loop antenna. The ferrite loaded, shielded half-loop antenna may include a base portion comprised of ferrite material
Data Source
AI summary
In one embodiment, a method implemented by an electromagnetic imaging system for imaging material within a metal container, the method comprising: transmitting to. and receiving signals from, a plurality of antennas attached to an interior wall of the metal container, the signals delivered over a plurality of channels, each of the plurality of antennas comprising a ferrite loaded, shielded half-loop antenna; measuring a plurality of scattering parameters (S-parameters) for all of the plurality of channels; calibrating the measurements; and providing an image of the material using an inversion algorithm based on the calibrated measurements.