Aperiodic Conformal Reflectarray Antenna Design
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Solution Overview
Problem
Conventional reflectarray antennas are limited by their periodic and planar designs, which restrict flexibility and conformity, making it difficult to achieve optimal performance and adaptability to design specifications, especially in non-planar and aperiodic configurations.
Innovation Solution
The development of a multi-stage synthesis algorithm for designing one- or two-dimensional aperiodic conformal reflectarrays, which optimizes physical and geometrical parameters to satisfy design specifications, using a combination of continuous and phase-only discrete modeling stages to overcome computational complexity and achieve enhanced radiative behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional reflectarray antennas use periodic and planar designs, then manufacturing is simplified and synthesis algorithms are more effective, but flexibility and conformity to design specifications are restricted
Solution Approach 1:
The patent applies asymmetry by transitioning from periodic to aperiodic arrangements of electromagnetic scatterers. The aperiodic configuration allows variable spacing and positioning of scatterers across the aperture, enabling the antenna to conform to complex design specifications and achieve superior radiation patterns while maintaining manufacturability through standardized scatterer designs.
Solution Approach 2:
The patent implements curvature by transitioning from planar to conformal geometries. The scatterers are arranged on curved or non-planar surfaces, allowing the antenna to achieve three-dimensional conformal structures that provide enhanced adaptability to various mounting surfaces and improve radiation characteristics through controlled phase distribution across the curved aperture.
2Reliability
If aperiodic and conformal configurations are used, then flexibility and radiative behavior are enhanced, but computational complexity of synthesis increases
Solution Approach 1:
The patent applies segmentation by dividing the synthesis process into multiple discrete stages: initial configuration setup, iterative optimization cycles, and final validation. Each stage processes specific aspects of the aperiodic conformal design, breaking down the computationally intensive task into manageable segments that can be executed sequentially with controlled complexity at each step.
Solution Approach 2:
The patent implements preliminary action by pre-defining scatterer positions, spacings, and orientations before the optimization process begins. The initial configuration includes predetermined geometric parameters and constraints that guide the subsequent iterative synthesis, reducing the search space and computational burden while ensuring the final design meets all specification requirements.
3Adaptability or versatility
If variable spacing and orientation of scatterers are implemented, then degrees of freedom increase for optimization, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by varying the spacing, orientation, and positioning of individual scatterers according to their specific locations within the aperture. Each scatterer is optimized for its local position to achieve the desired phase distribution and radiation characteristics, while the overall pattern maintains manufacturing feasibility through systematic variation rather than complete individual customization.
Solution Approach 2:
The patent implements parameter changes by systematically varying key geometric parameters including inter-scatterer spacing, scatterer orientation angles, and positional offsets across the aperture. These parameter variations are controlled and optimized to provide the necessary degrees of freedom for achieving superior radiative behavior while maintaining manufacturability through standardized parameter sets and tolerances.
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 allows for the creation of high-performance, flexible, and adaptable aperiodic conformal reflectarrays that can satisfy stringent design specifications, offering improved radiative behavior and broadband performance while reducing beam squint and grating lobe effects.
Implementation Method 1
The curvature of the reflector is simulated by the phase shift introduced by the various scatterers, a phase shift which in turn depends on the form and dimension thereof
Implementation Method 2
replacing the continuous and curved reflective surface of the parabolic reflector with a (generally periodic and planar) array of passive electromagnetic scatterers
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
One- or two-dimensional array of electromagnetic scatterers, characterized in that the aforementioned scatterers are arranged aperiodically on a curved line or surface. Reflectarray antenna comprising: at least one such array of electromagnetic scatterers and at least one receiving and/or transmitting feed, cooperating with said array to generate an antenna beam. Method for designing and manufacturing said array and said antenna.