Frequency Gradient Metasurface for Fast Beam Steering in OWC
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Solution Overview
Problem
Current optical wireless communication systems face challenges in designing efficient transmission devices that can stabilize and efficiently transmit beams for high-speed optical communication, particularly in next-generation wireless communication systems like 6G, which require advanced antenna technologies to support high data rates and low latency.
Innovation Solution
The use of a metasurface as a transmission antenna, designed based on specific parameters such as center frequency, virtual antenna spacing, and frequency comb interval, allows for the generation and transmission of beams efficiently and stably, enabling high-speed optical communication by creating a virtual antenna array that focuses energy at different focal points for each frequency, effectively steering the beam in 4D space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional transmission antenna is used in optical wireless communication systems, then the system structure is simple, but the beam transmission efficiency and stability are insufficient for high-speed optical communication
Solution Approach 1:
The patent applies parameter changes by designing the metasurface with specific geometric parameters (unit cell dimensions, meta-atom configurations, spacing arrangements) that are optimized for frequency gradient beam steering. The metasurface parameters are tuned to create different phase gradients across the surface, enabling efficient beam steering without complex mechanical moving parts.
Solution Approach 2:
The patent replaces conventional mechanical beam steering mechanisms with a static metasurface that achieves beam steering through electromagnetic parameter modulation. Instead of physically moving antenna elements or adjusting mechanical phases, the system uses subwavelength meta-atoms with specific geometric configurations to achieve phase control, thereby improving reliability and reducing mechanical complexity.
2Speed
If the beam direction is not dynamically controlled, then the device complexity is reduced, but the communication speed and adaptability are limited
Solution Approach 1:
The patent implements dynamic beam control through a frequency-gradient metasurface where different frequency components experience different phase gradients. This creates dynamic beam steering capability without mechanical movement, as the phase gradient is inherently frequency-dependent. The system can rapidly switch between different beam directions by changing the input signal frequency, enabling high-speed communication adaptability.
Solution Approach 2:
The patent segments the broadband signal into multiple frequency components, each experiencing a different phase gradient at the metasurface. This frequency-domain segmentation allows simultaneous multi-directional beam formation or rapid beam switching, enhancing communication speed and adaptability without requiring complex time-domain switching mechanisms.
3Manufacturing precision
If the metasurface is not optimized with specific parameters, then the design process is simpler, but the beam focusing and steering performance deteriorates
Solution Approach 1:
The patent employs systematic parameter optimization where the metasurface unit cell dimensions, meta-atom geometries, and spacing are precisely tuned to achieve the desired frequency gradient phase response. This parameter optimization enables accurate beam focusing and steering while maintaining a relatively simple overall structure that can be manufactured using standard nanofabrication techniques.
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 approach enhances the efficiency and stability of beam transmission, enabling high-speed and reliable optical communication by dynamically controlling the beam direction and focus, overcoming limitations in existing systems.
Implementation Method 1
Frequency gradient metasurface-based fast beam steering transmission method and apparatus for OWC
Implementation Method 2
a more efficient metasurface can be designed, it is possible to generate and transmit a beam more efficiently and stably
Data Source
AI summary
The present specification provides a method and apparatus, the method being for transmitting a beam, performed by the apparatus, in an optical wireless communication system, and comprising: generating a pulse laser signal; making the pulse laser signal to be incident on a metasurface, wherein the beam is generated on the basis that the pulse laser signal is incident on the metasurface; and transmitting the beam to a reception apparatus, wherein the metasurface is determined on the basis of ω_0, d, Δω, and N, wherein ω_0 is a value of a center frequency, d is a value of a virtual antenna interval, Δω is a value of a frequency comb interval, and N is a value related to the number of frequency combs present within a gain bandwidth based on the center frequency.