Reconfigurable Meta-Surface Beam Steering for Indoor mmWave Coverage
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Solution Overview
Problem
The challenge of limited mmWave coverage and reliability in complex indoor environments due to path loss and obstacles, which is exacerbated by the high cost of deploying large numbers of transceivers, is addressed by the use of meta-surfaces that passively reflect base station signals without an RF chain.
Innovation Solution
A beam steering apparatus utilizing a meta-surface with controllable unit cells, variable capacitance elements, and a computation and control unit to steer beams based on control signals, enabling constructive and destructive interference for optimal signal reflection and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large number of expensive transceivers are installed to address path loss and coverage limitations, then coverage and reliability are improved, but deployment cost increases significantly
Solution Approach 1:
The patent introduces a passive meta-surface as an intermediary component between the base station and user equipment. This meta-surface reflects and steers mmWave signals without requiring active RF chains or transceivers, thereby improving coverage and reliability while avoiding the high deployment costs and complexity associated with installing numerous active transceivers.
Solution Approach 2:
The patent replaces the mechanical/electronic system of active transceivers with a passive electromagnetic structure (meta-surface). The meta-surface uses controlled reflection and interference of electromagnetic waves to achieve beam steering, eliminating the need for complex RF hardware and reducing deployment complexity.
2Device complexity
If passive meta-surfaces are used to reflect base station signals without RF chains, then deployment cost is reduced, but adaptability to different channels and user mobility is limited
Solution Approach 1:
The patent implements a reconfigurable meta-surface where the electrical properties of individual unit cells can be dynamically adjusted via control signals. This allows the passive structure to adapt its reflection characteristics in real-time, enabling it to track mobile users and adjust to different channel conditions while maintaining low deployment complexity.
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) of the meta-surface unit cells dynamically through control signals from the base station. By varying these parameters, the meta-surface can adapt its beam steering and reflection properties to match different channel conditions and user mobility patterns.
3Measurement precision
If unit cells with variable capacitance elements are used for beam steering, then beam steering precision is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic switching of the variable capacitance elements in the unit cells rather than continuous power consumption. The capacitance values are changed in discrete steps at specific intervals based on control signals, achieving precise beam steering while minimizing energy consumption by keeping the system in a low-power state between adjustments.
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 apparatus achieves smooth communication with low power consumption and improved reliability by dynamically steering beams to overcome obstacles, allowing for extended mmWave coverage and reduced energy usage.
Implementation Method 1
a variable capacitance element connected between the metal plates
Implementation Method 2
a beam steering apparatus that reflects a beam for steering
Implementation Method 3
signal reflected from each line in the array may constructively interfere at a certain angle and destructively interfere at another angle
Data Source
AI summary
Disclosed is a beam steering apparatus that reflects a beam for steering, the beam steering apparatus including a front end unit configured to receive a control signal; and a meta-surface with controllable unit cells arranged in an array, the unit cells including metal plates spaced apart from each other, a variable capacitance element connected between the metal plates, and a line to which a meta-surface control signal is provided; and a computation and control unit configured to generate a meta-surface control signal for controlling the meta-surface according to the control signal wherein the beam reflected from the meta-surface is steered according to the control signal.