Transmissive Surface Coating Pattern for RF Signal Coverage
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Solution Overview
Problem
Existing energy-attenuating laminates, such as construction glass, effectively block radio frequency signals due to metal layers, leading to signal loss and limited coverage when transmitting through structures.
Innovation Solution
Implement a non-uniform etching pattern on the energy-attenuating coating, with cells having varying sizes and shapes along different directions to adjust the phase and amplitude of radio frequency signals, allowing for reduced attenuation and improved signal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a uniform energy-attenuating coating is applied on the substrate, then radio frequency signal attenuation is strong, but signal transmission coverage is limited and signal loss increases
Solution Approach 1:
The uniform energy-attenuating coating is segmented into a non-uniform pattern with varying cell sizes and shapes. This segmentation creates different attenuation zones that allow radio frequency signals to pass through with reduced attenuation in specific directions, thereby improving signal transmission coverage while maintaining energy attenuation functionality.
Solution Approach 2:
The coating transitions from uniform to non-uniform with locally varied cell structures. Different regions of the coating have different cell sizes and shapes, creating local variations in attenuation properties. This allows the coating to provide strong attenuation in some areas while permitting signal transmission in others, resolving the contradiction between attenuation strength and coverage.
2Loss of energy
If the energy-attenuating coating blocks radio frequency signals, then energy attenuation is effective, but signal propagation through the structure is limited
Solution Approach 1:
The coating structure is made dynamic through its non-uniform pattern, where cell sizes and shapes vary to create direction-dependent attenuation. This dynamic structure allows the coating to adaptively attenuate energy in certain directions while permitting signal propagation in others, balancing energy attenuation effectiveness with signal propagation efficiency.
Solution Approach 2:
The physical parameters of the coating cells (size, shape, distribution) are changed from uniform to non-uniform. This parameter variation creates different attenuation characteristics across the coating, enabling it to maintain effective energy attenuation while allowing radio frequency signals to propagate through the structure with improved efficiency.
3Reliability
If a patterned coating with openings is used to reduce attenuation, then signal transmission improves, but the coating structure becomes more complex
Solution Approach 1:
The coating is segmented into repeating cell patterns with varying sizes and shapes. While this creates a non-uniform structure, the segmentation into standardized cell units simplifies manufacturing compared to completely custom patterns, balancing signal transmission quality with manufacturing complexity.
Solution Approach 2:
The coating implements local quality variations through controlled cell size and shape changes in specific regions. This allows the coating to optimize signal transmission in different areas while maintaining a systematic pattern structure that is manageable in terms of manufacturing 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
The non-uniform etching pattern enhances signal transmission by shaping and directing radio frequency beams, increasing coverage and reducing signal loss within structures.
Implementation Method 1
an energy-attenuating coating provided on a substrate, the energy-attenuating coating causing an attenuation of radio frequency signals that propagate through the transmissive surface
Implementation Method 2
cells having varying sizes or shapes such that a propagated radio frequency signal experiences a varying phase adjustment across the pattern of cells in the second direction
Data Source
AI summary
An transmissive surface and a method for forming a transmissive surface are described. The transmissive surface may include a substrate and an energy-attenuating coating located on the substrate. The energy-attenuating coating may cause an attenuation of radio frequency signals that propagate through the transmissive surface. A portion of the energy-attenuating coating may include a pattern of cells that provides a reduced attenuation of radio frequency signals that pass through the portion of the energy-attenuating coating relative to other portions of the energy-attenuating coating outside of the pattern of cells. The pattern of cells may be consistent along a first direction and varied across a second direction perpendicular to the first direction such that a same phase adjustment of a propagated radio frequency signal is applied along the first direction and a varying phase adjustment is applied along the second direction.