Spectral MoM NUFFT-Based Formulation for the Efficient Analysis of High-Order Bandpass FSSs With Tightly Packed Nonresonant Elements in Skewed Grid

This communication presents a formulation of the spectral-domain Method of Moments (spectral MoM) for the analysis of periodic multilayered structures with a number of metallized interfaces alternating patches and apertures. Edge singularity entire-domain basis functions are used to model the electr...

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Bibliographic Details
Published inIEEE transactions on antennas and propagation Vol. 69; no. 9; pp. 6099 - 6104
Main Authors Corcoles, Juan, Boix, Rafael R.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.09.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Apertures
Bandpass
Basis functions
Design optimization
Dielectrics
Domains
Electric fields
Fast Fourier transformations
Fourier transforms
Frequency selective surfaces
frequency selective surfaces (FSSs)
Lattices
Lattices (mathematics)
Metallization
Metallizing
Method of moments
moment methods
multilayered media
Patches (structures)
Periodic structures
Software
Spectra
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Summary:This communication presents a formulation of the spectral-domain Method of Moments (spectral MoM) for the analysis of periodic multilayered structures with a number of metallized interfaces alternating patches and apertures. Edge singularity entire-domain basis functions are used to model the electric currents on the patches and the tangential electric fields in the apertures. The formulation is especially suitable to characterize high-order bandpass frequency selective surfaces (FSSs) made up of nonresonant elements. Also in this communication, the nonuniform fast Fourier transform (NUFFT) is used in the spectral MoM to cover the case of unit cells in skewed grids, which enables the analysis of nonrectangular periodic lattices with tightly packed elements. Numerical examples of the design of third-order and fifth-order bandpass FSSs are presented. The FSSs are made up of hexagonal patches and apertures arranged in an equilateral triangular lattice. Results are cross-checked against commercial software CST Microwave Studio (CST MWS), and excellent agreement is found, our in-house software being more than one order of magnitude faster than CST MWS. This CPU time saving makes the proposed formulation very convenient for full-wave optimization and design.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2021.3061138