Grating Lobe Metasurface Beam Splitting Design
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Solution Overview
Problem
Existing multibeam metasurface technologies face challenges in achieving complex beam control with compact, cost-effective designs due to complex feed-horn arrangements, large-phased arrays, and geometrical design approaches that suffer from high side-lobe levels and gain loss.
Innovation Solution
A multibeam metasurface design that utilizes a single surface with optimized grid periodicity and orientation to split an impinging electromagnetic wave into desired beam splitting angles, leveraging grating lobes to achieve this functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If feed-horn clusters with reflectors are used to achieve multibeam capabilities, then beam direction control is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the mechanical feed-horn cluster system with a metasurface that uses electromagnetic field manipulation. The metasurface consists of sub-wavelength unit cells that control beam directions through phase and amplitude modulation of the electromagnetic waves, eliminating the need for complex mechanical feed-horn arrangements and reflectors.
Solution Approach 2:
The patent changes the operational parameters by using a continuous metasurface with variable unit cell designs rather than discrete feed-horns. Each unit cell's geometry is optimized to produce specific phase and amplitude characteristics, enabling multibeam control through parameter optimization rather than mechanical configuration.
2Adaptability or versatility
If large-phased arrays with independent phase shifters are used, then versatile beam control is improved, but size, weight, and cost increase
Solution Approach 1:
The patent merges the functions of multiple phase shifters and radiating elements into a single integrated metasurface. The unit cells are designed to provide both phase and amplitude control simultaneously, combining multiple functions into one structure and eliminating the need for separate phase shifter components for each element.
Solution Approach 2:
The metasurface unit cells are designed to be multi-functional, providing both phase modulation and amplitude control in a single element. This universal design allows the same structure to achieve versatile beam control without requiring additional components for each function.
3Adaptability or versatility
If geometrical design divides surface into multiple sub-arrays, then beam direction diversity is improved, but side-lobe level increases and gain decreases
Solution Approach 1:
The patent applies local quality optimization by designing each unit cell with specific geometric characteristics tailored to its position in the metasurface. The unit cell geometry is locally optimized to control the phase and amplitude of radiated waves, enabling precise beam formation without the need for amplitude tapering that causes high side-lobes in sub-array designs.
Solution Approach 2:
Instead of dividing the surface into multiple sub-arrays as in conventional approaches, the patent uses a continuous metasurface design where the unit cells are densely packed without gaps. This inverted approach maintains phase continuity across the entire surface, avoiding the beam broadening and gain loss associated with sub-array divisions.
4Device complexity
If superposition design is used without individual amplitude and phase control, then design simplicity is improved, but performance degrades with high side-lobe and gain loss
Solution Approach 1:
The patent achieves individual amplitude and phase control by changing the geometric parameters of each unit cell. The unit cell dimensions, shapes, and orientations are optimized to produce the desired phase and amplitude characteristics, enabling precise control without complex additional components while maintaining high beam performance.
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 proposed solution enables efficient beam splitting into multiple directions with improved side-lobe performance and gain retention, resulting in a more compact, cost-effective, and efficient multibeam metasurface.
Implementation Method 1
A multibeam metasurface design that utilizes a single surface with optimized grid periodicity and orientation to split an impinging electromagnetic wave into desired beam splitting angles, leveraging grating lobes to achieve this functionality.
Data Source
AI summary
The technology described herein is directed towards designing and implementing multibeam metasurfaces, based on deriving the directions of grating lobes within a general rectangular grid structure. The derivation is used to design and implement multibeam metasurfaces. A multibeam metasurface is designed based on the directions of the grating lobes and desired beam splitting angles, which are used to determine unit cell/element grid characteristics of periodicity data and orientation. When deployed, the multibeam metasurface splits an impinging electromagnetic wave/beam in the desired multiple beam splitting directions. In one implementation, the multibeam metasurface is implemented in a single surface.