Design and Realization of a Low Cross-Polarization Conical Horn With Thin Metasurface Walls

Sozio, Valentina; Martini, Enrica; Caminita, F.; Vita, P. De; Faenzi, Marco; Giacomini, A.; Sabbadini, M.; Maci, S.; Vecchi, G.

doi:10.1109/tap.2020.2975253

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…In this section, two examples are presented to show the effectiveness and accuracy of the proposed formulation. In particular, we analyze the transmitted field by two MetSs excited by the horn antenna with MTS walls described in [36], at an operating frequency f = 12GHz. In the following results, the radius of the horn and of the MetS is 49.8mm; the dielectric spacers have a thickness d = 3.175mm and relative permittivity r = 2.33; the distance between the horn aperture and the MetS is 12.5mm.…”

Section: Numerical Resultsmentioning

confidence: 99%

A Physical Optics Approach to the Analysis of Metascreens

et al. 2020

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Artificial screens based on metasurfaces (MTSs), also called metascreens (MetSs) are becoming a very popular tool for electromagnetic field manipulation. While significant research efforts have been devoted to the development of synthesis methodologies, less work has been done for the accurate modeling of real structures based on this concept. This paper presents a method based on a Physical Optics (PO) for the efficient description of the scattered field of metascreens consisting of a stack of MTS separated by dielectric layers. The derivation of the PO currents is based on the definition of proper transmsission coefficients for the electric and magnetic fields which, in turn, relies on an equivalent transmission line model of the multilayer structure. In this model, the MTSs are represented through homogenized equivalent surface impedances. The proposed model takes into account the non-local transmission properties and the finite thickness and size of the MetS. The accuracy in the scattered field prediction has been verified through comparison with full-wave simulations. INDEX TERMS Metasurfaces, metascreens, equivalent impedance, physical optics, scattering.

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Section: Numerical Resultsmentioning

confidence: 99%

A Physical Optics Approach to the Analysis of Metascreens

et al. 2020

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“…Furthermore, the use of anisotropic MTS walls in closed waveguides also allows for the control of the field polarization [75]. This effect has been successfully exploited to design MTS-based hybrid mode feed horns [76]- [78], which represent a compact and low-cost alternative to corrugated horns. In this case, the entries of the anisotropic MTS impedance are designed to satisfy the balanced condition that ensures zero cross-polarization.…”

Section: B Closed Waveguides With Mts Wallsmentioning

confidence: 99%

“…An example of conical horn with MTS walls and relevant radiation pattern is shown in Fig. 11 (from [78]).…”

Section: B Closed Waveguides With Mts Wallsmentioning

confidence: 99%

Modulated Metasurfaces for Microwave Field Manipulation: Models, Applications, and Design Procedures

Martini

Maci

2022

IEEE J. Microw.

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Metasurfaces (MTSs) have emerged in the last years as a promising platform for next generation planar devices in a broad range of frequencies, thanks to their unique field manipulation capability. In particular, in the microwave range this solution is characterized by low-cost, lightweight, and simple integration with electronic circuits, since MTSs can be realized in PCB technology by printing electrically small patches over a dielectric slab. The MTS behavior can then be conveniently described in terms of homogenized boundary conditions of impedance type. Spatial modulation of these boundary conditions allows one to implement a broad class of functionalities, involving space wave or surface wave control, as well as conversion from surface waves to leaky waves. This paper reviews numerical and analytical models, design procedures and microwave applications of modulated MTSs, with particular emphasis on surface wave manipulation, and it discusses expected future developments of this technology.INDEX TERMS Impedance boundary conditions, leaky wave antennas, metasurfaces, periodic structures, planar antennas, planar lenses, surface waves.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

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“…That is, the design aims at finding the spatial distribution of a surface impedance; after that, the final layout is achieved by finding the geometrical parameters of the considered unit cell so that it produces the previously determined impedance profile. This two-phase approach is the one followed by virtually all published works; it is interesting to note its robustness: in [6] it has been shown to be effective even for a non-flat structure (a conical horn). The present work deals with finding the spatial distribution of the metasurface surface impedance; the realization of the unit cells is not part of this work and can be done with a variety of existing approaches, e.g., [4], [7].…”

Section: Introductionmentioning

confidence: 99%

Current Based Automated Design of Realizable Metasurface Antennas With Arbitrary Pattern Constraints

Zucchi

Verni

Righero

et al. 2023

IEEE Trans. Antennas Propagat.

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We present a 3D method to numerically design a realizable metasurface, which transforms a given incident field into a radiated field that satisfies mask-type (inequality) constraints. The method is based on an integral equation formulation, with local impedance boundary condition (IBC) approximation. The procedure yields the spatial distribution of the impedance, yet the process involves the synthesis of the equivalent current only. This current is constrained to correspond to a realizable surface impedance, i.e., passive, lossless, and with reactance values bounded by practical realizability limits. The current-based design avoids any solution of the forward problem, and the impedance is obtained from the synthesized current only at the end of the process. The procedure is gradientbased, with the gradient expressed in closed form. This allows handling large metasurfaces, with full spatial variability of the impedance in two dimensions. The method requires no a priori information, and all relevant operations in the iterative process can be evaluated with O(N log N ) complexity. Application examples concentrate on the case of on-surface excitation and far-field pattern specifications; they show designs of circular and rectangular metasurface antennas of 20 wavelengths in size, with pencil-and shaped-beam patterns, and for both circular and linear polarization.

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Design and Realization of a Low Cross-Polarization Conical Horn With Thin Metasurface Walls

Cited by 10 publications

References 21 publications

A Physical Optics Approach to the Analysis of Metascreens

A Physical Optics Approach to the Analysis of Metascreens

Modulated Metasurfaces for Microwave Field Manipulation: Models, Applications, and Design Procedures

Current Based Automated Design of Realizable Metasurface Antennas With Arbitrary Pattern Constraints

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