Microwave Moisture Sensor Shielding With EM Absorbent Coatings
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Solution Overview
Problem
Sensor devices using microwave technology for moisture measurement are prone to performance degradation due to electromagnetic noise interference, affecting measurement accuracy.
Innovation Solution
A sensor device design incorporating transmission and reception antennas with specific substrate configurations, including electromagnetic absorbent coatings and shield layers, and precise positioning and thickness settings to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If microwave type measurement is used, then measurement speed is improved, but measurement accuracy deteriorates due to electromagnetic noise
Solution Approach 1:
The patent applies electromagnetic absorbent material to convert harmful electromagnetic noise into beneficial noise reduction, thereby improving measurement accuracy while maintaining microwave-type measurement speed. The absorbent material is coated on the outer circumference of the substrate to absorb stray electromagnetic waves and reduce interference with the measurement signal.
Solution Approach 2:
The patent implements localized shielding by coating only specific regions of the substrate with electromagnetic absorbent material, rather than the entire substrate. This local quality approach reduces noise interference at critical measurement areas while maintaining the overall microwave measurement functionality and speed.
2Object-affected harmful factors
If electromagnetic absorbent coating is added, then noise resistance is improved, but device complexity increases
Solution Approach 1:
The patent merges the electromagnetic absorbent coating directly with the substrate structure, integrating the noise reduction function into the existing device architecture. This combination approach reduces device complexity by eliminating separate noise shielding components while maintaining effective noise resistance through the coated substrate.
Solution Approach 2:
The patent uses composite material construction by combining the substrate material with electromagnetic absorbent coating material. This composite structure provides both the structural support of the substrate and the noise-absorbing properties of the coating material, achieving noise resistance without adding significant device complexity.
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
Enhances moisture measurement accuracy by reducing noise interference and stabilizing antenna positions, ensuring precise and reliable moisture detection.
Implementation Method 1
a first coating layer coating an outer circumference of the substrate in a part of the transmission substrate and is formed using an electromagnetic absorbent material and a second coating layer coating an outer circumference of the substrate in a part of the reception substrate and is formed using an electromagnetic absorbent material
Data Source
AI summary
A sensor device is disclosed for measuring an amount of moisture in a medium that includes: a transmission antenna; a reception antenna to receive electromagnetic waves transmitted from the transmission antenna and through a medium; a measurement unit to measure the electromagnetic waves propagating to the reception antenna; and a sensor casing and further includes a transmission substrate including a plurality of wiring layers and a reception substrate including a plurality of wiring layers, and a measurement unit substrate including a plurality of wiring layers and includes the measurement unit or a first coating layer that, in a part of the transmission substrate, coats an outer circumference of the substrate and is formed from an electromagnetic wave absorbent material and a second coating layer that, in a part of the reception substrate, coats an outer circumference of the substrate and is formed from an electromagnetic wave absorbent material.