Millimeter-Wave Floor Dielectric Layout for Stable Reception Power
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Solution Overview
Problem
High frequency systems face instability in reception power due to the combination of direct and indirect wave paths, leading to varying phase and amplitude, which affects detection accuracy and stability, especially in millimeter wave systems used for detecting objects or vital signals at short distances.
Innovation Solution
A high frequency system is designed with a vertically polarized antenna and a dielectric layer on the floor with a relative dielectric constant of 2 to 6, where the millimeter wave is refracted and reflected under the layer, reducing indirect wave influence by setting the incident angle between 30° and 70° and ensuring sufficient dielectric loss tangent and thickness to attenuate the wave effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric layer is added to suppress indirect wave reflection, then reception power stability is improved, but device complexity increases
Solution Approach 1:
A dielectric layer is introduced as an intermediary substance between the air and the reflective floor surface. This layer mediates the interaction between the millimeter wave and the floor, controlling the reflection of indirect waves while maintaining the floor's structural integrity and aesthetic properties.
Solution Approach 2:
The dielectric constant of the floor surface is modified by adding a dielectric layer with specific electrical properties. This changes the electromagnetic parameters of the floor surface to reduce unwanted reflections of indirect waves in the millimeter wave path.
2Object-affected harmful factors
If the dielectric layer thickness is increased to enhance wave attenuation, then indirect wave suppression is improved, but power loss increases
Solution Approach 1:
The thickness of the dielectric layer is optimized to a specific range that balances two competing requirements: it must be thick enough to effectively attenuate indirect waves through multiple reflections and absorptions, but not so thick that it causes excessive power loss to the direct wave path.
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
This configuration stabilizes the reception power by minimizing the impact of indirect waves, reducing power loss variations and enhancing detection accuracy and range in millimeter wave systems.
Implementation Method 1
the millimeter wave is refracted and reflected under the layer
Implementation Method 2
the electromagnetic wave propagating through the first dielectric layer is reflected under the first dielectric layer
Implementation Method 3
ensuring sufficient dielectric loss tangent and thickness to attenuate the wave effectively
Implementation Method 4
an antenna that transmits a high frequency electromagnetic wave vertically polarized with respect to a floor to an object and receives the electromagnetic wave reflected by the object
Implementation Method 5
In the object, the direct wave propagated through the direct path and the indirect wave propagated through the indirect path are combined. The paths along which the reflected wave reflected from the object reaches the receiving antenna also include a direct path and an indirect path. In the receiving antenna, the direct wave propagated through the direct path and the indirect wave propagated through the indirect path are combined. In this way, by combining the two times, the reception power periodically varies depending on the phase and amplitude
Data Source
AI summary
A high frequency system includes an antenna that transmits a high frequency electromagnetic wave vertically polarized with respect to a floor to an object and receives the electromagnetic wave reflected by the object, and a first dielectric layer provided on an uppermost layer of the floor in a region including a portion where the electromagnetic wave is reflected in a path of the electromagnetic wave between the antenna and the object, the first dielectric layer having a relative dielectric constant of 2 or more and 6 or less at a frequency of the electromagnetic wave, wherein the electromagnetic wave propagating through the first dielectric layer is reflected under the first dielectric layer, and a distance between the antenna and the object in a direction parallel to a plane including an upper surface of the first dielectric layer at the portion is 10 m or less.