Frequency-Selective Reflector Module for Non-Line-of-Sight Coverage
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Solution Overview
Problem
New generation wireless networks face challenges in providing reliable coverage in complex environments due to high atmospheric attenuation and geographical obstructions, especially in millimeter wave communications, which result in non-line-of-sight areas and dead zones.
Innovation Solution
A frequency-selective reflector module system that uses Meta-Structure Reflector Modules (MRMs) with multiple layers of Frequency-Selective Substrate (FSS) to reflect and direct wireless signals, enabling ubiquitous coverage by generating multiple transmission beams and controlling beam formation to overcome obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If millimeter wave communications are used to provide high-speed wireless connectivity, then data transmission speed and capacity are improved, but atmospheric attenuation and geographical obstructions cause signal loss in non-line-of-sight areas
Solution Approach 1:
The patent introduces Frequency-Selective Substrate (FSS) layers as intermediary elements that mediate between the transmitted millimeter wave signal and the receiving devices. These FSS layers act as frequency-selective mirrors that reflect signals at specific frequencies while allowing other frequencies to pass through, enabling signal redirection around obstacles and into non-line-of-sight areas without direct line-of-sight connection.
Solution Approach 2:
The patent changes the frequency parameter of the transmitted signal by using multiple FSS layers with different frequency selectivity characteristics. Each layer is designed to reflect or transmit specific frequency ranges, allowing the system to optimize signal propagation by selecting appropriate frequency parameters for different propagation conditions and path types.
2Area of stationary object
If large array antennas are deployed to extend coverage range, then coverage area is improved, but extreme climatic conditions with heavy precipitation and strong winds make deployment difficult
Solution Approach 1:
The patent segments the large array antenna system into distributed Frequency-Selective Substrate layers that can be independently deployed and positioned. Instead of deploying one large vulnerable array, the system uses multiple smaller FSS layers that can be strategically placed throughout the coverage area, each contributing to the overall signal reflection and transmission functionality.
Solution Approach 2:
The patent replaces the traditional mechanical large array antenna system with a field-based solution using Frequency-Selective Substrates. Rather than relying on large physical antenna structures that are vulnerable to weather, the system uses electromagnetic field manipulation through FSS layers with specific frequency-selective properties to achieve coverage extension.
3Reliability
If Frequency-Selective Substrate layers are used to reflect and direct wireless signals, then coverage in non-line-of-sight areas is improved, but system complexity increases
Solution Approach 1:
The Frequency-Selective Substrate layers serve multiple functions simultaneously: they reflect signals at specific frequencies, allow transmission of other frequencies, provide beam forming capabilities, and enable signal direction control. This multi-functionality reduces the need for separate components for each function, thereby managing system complexity while achieving reliable coverage.
Solution Approach 2:
The patent employs composite Frequency-Selective Substrate structures that combine multiple layers with different electromagnetic properties. These composite FSS structures integrate various functional characteristics (reflection, transmission, beam forming) into unified layers, simplifying the overall system architecture while maintaining the ability to provide reliable coverage in challenging environments.
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 system effectively extends wireless coverage into non-line-of-sight areas and dead zones, improving connectivity and reducing interference, thereby enhancing the reach and reliability of wireless communications in challenging environments.
Implementation Method 1
The reflector module includes a first set of layers including a first Frequency-Selective Substrate layer that reflects the signal received from the transmitter at a first frequency, allowing signals at a second frequency to pass through the first Frequency-Selective Substrate layer
Data Source
AI summary
Examples disclosed herein relate to a reflector device, having a first conductive layer of substrate, a dielectric layer of substrate, and a second conductive layer patterned with a first and a second set of frequency selective elements configured to reflect an incident electromagnetic radiation beam into a plurality of reflected beams at phase angles different from that of the incident electromagnetic radiation beams.