Abstract

This paper presents a method for the efficient analysis of multilayer frequency selective surfaces (FSSs) integrated with phased array of open-ended waveguides. The method is based on the assumption that all the periodic surfaces are arranged on the same spatial lattice (of arbitrary shape). The whole structure is represented as an equivalent multi-mode transmission line network, where each interface is characterized by an equivalent immittance matrix, computed through a full-wave analysis. To reduce the computational effort of the analysis a fast adaptive model-based interpolation algorithm for the scattering matrix entries is included. A software has been developed, which will provide an useful tool for the design of integrated FSS for phased array antennas.

Highlights

  • A growing interest has been devoted to the application of frequency selective surfaces (FSS) [1] for obtaining specific electromagnetic properties, such as artificial surfaces, artificial magnetic conductors, enhanced directivity, electromagnetic band-gap properties

  • The MoM analysis is applied separately to each periodic discontinuity of the unit cell, with the goal to describe each transition by the Generalized Scattering Matrix (GSM) [7] as shown in the example of Fig. 2

  • Once the periodic surfaces are characterized by their GSM, the complete equivalent network, associated to the entire stratification, is solved by the connecting the scattering matrices with equivalent transmission-lines associated to the accessible modes

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Summary

Introduction

A growing interest has been devoted to the application of frequency selective surfaces (FSS) [1] for obtaining specific electromagnetic properties, such as artificial surfaces, artificial magnetic conductors, enhanced directivity, electromagnetic band-gap properties. Another field of interest is the integration of FSS with phased array antennas [2], with the purpose of improving the antenna performance (widening of scan region, scan-blindness removal [3], wide angle impedance matching [4]). The array excitation amplitude may be uniform or weakly spatially

Formulation
Derivation of the Generalized Scattering Matrix
Interpolation of Scattering Matrix
Validation and Numerical Results
Conclusions
Full Text
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