Abstract
In this work, a simple, efficient and accurate database in the form of a lookup table to use in reflectarray design and direct layout optimization is presented. The database uses N-linear interpolation internally to estimate the reflection coefficients at coordinates that are not stored within it. The speed and accuracy of this approach were measured against the use of the full-wave technique based on local periodicity to populate the database. In addition, it was also compared with a machine learning technique, namely, support vector machines applied to regression in the same conditions, to elucidate the advantages and disadvantages of each one of these techniques. The results obtained from the application to the layout design, analysis and crosspolar optimization of a very large reflectarray for space applications show that, despite using a simple N-linear interpolation, the database offers sufficient accuracy, while considerably accelerating the overall design process as long as it is conveniently populated.
Highlights
In this work, a simple, efficient and accurate database in the form of a lookup table to use in reflectarray design and direct layout optimization is presented
We propose a simple database in the form of a lookup table of reflection coefficients with efficient memory access and a fast but effective N-linear interpolation approach for the analysis, layout design and crosspolar optimization of reflectarray antennas
We have presented a simple and efficient database for reflectarray analysis, layout design and direct layout optimization for cross-polarization improvement
Summary
A simple, efficient and accurate database in the form of a lookup table to use in reflectarray design and direct layout optimization is presented. The results obtained from the application to the layout design, analysis and crosspolar optimization of a very large reflectarray for space applications show that, despite using a simple N-linear interpolation, the database offers sufficient accuracy, while considerably accelerating the overall design process as long as it is conveniently populated Since they were first proposed in the 1960s [1], reflectarray antennas have evolved from bulky waveguide array profiles to microstrip low-profile antennas, introducingg an important reduction in manufacturing costs as well as more reliable manufacturing processes and design techniques [2,3].
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