Recent Advances in Beam Focusing through Resonant Bessel-Beam Launchers for Millimeter-Wave WPT Applications

Negri, Edoardo; Benassi, Francesca; Fuscaldo, Walter; Masotti, Diego; Burghignoli, Paolo; Costanzo, Alessandra; Galli, Alessandro

doi:10.23919/eucap57121.2023.10133773

Cited by 3 publications

References 20 publications

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Design of TE-polarized resonant Bessel-beam launchers for wireless power transfer links in the radiative near-field region

Negri,

Benassi,

Fuscaldo

et al. 2024

Int. J. Microw. Wireless Technol.

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Resonant Bessel-beam launchers (BBLs)are radiating devices constituted by a cylindrical metallic cavity with a partially reflecting sheet (PRS) on top. Millimeter-wave resonant BBLs typically exhibit transverse magnetic (TM) polarization due to the use of coaxial probes as feeders and homogenized metasurfaces as PRS. Launchers showing either a purely transverse electric (TE) or a hybrid (quasi-TE) polarization have recently been proposed for realizing wireless power transfer (WPT) links in the radiative near-field region at millimeter waves. The former are obtained by means of a radial slot array as a feeder and a homogenized metasurface as a PRS. The latter are obtained by using a loop antenna as a feeder and an annular strip grating in the homogenization limit as radiating aperture. In this work, based on an original semi-analytical model, such a metasurface is demonstrated to show a dichroic behavior. This interpretation explains the improvement in terms of polarization purity with respect to more nondichroic conventional homogenized metasurfaces. The behavior of the annular strip grating under a pure TM polarization is tested with a coaxial feeder, whereas its behavior under a pure TE polarization is tested by means of the radial slot array feeder. Results confirm the validity of the proposed analysis, which is finally exploited to evaluate the WPT performance.

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Design of TE-polarized resonant Bessel-beam launchers for wireless power transfer links in the radiative near-field region

Negri,

Benassi,

Fuscaldo

et al. 2024

Int. J. Microw. Wireless Technol.

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An efficient and accurate semi-analytical matching technique for waveguide-fed antennas

Negri,

Fuscaldo,

Tofani

et al. 2024

Sci Rep

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Several RF and microwave radiating devices, such as horn antennas, Fabry–Perot cavity antennas, and aperture-fed focusing devices, are excited through rectangular waveguides. The impedance matching of the overall system (from the waveguide feed to the radiating aperture) is a task of crucial importance that is often addressed by means of brute-force parameter-sweep full-wave analyses or blind optimization algorithms. In both cases, a significant amount of memory and time resources are required. For this purpose, we propose here a simple, yet effective solution, which only requires a single full-wave simulation and a semi-analytical procedure. The former is used to retrieve the antenna input impedance at the end of the waveguide port excitation. The semi-analytical procedure consists in a transmission-line equivalent circuit that models two waveguide discontinuities (namely two capacitive irises) within the waveguide section, whose position and geometric features are finely tuned to obtain a satisfactory impedance matching around the working frequency. The proposed method is shown to be effective in diverse and attractive application-oriented contexts, from the impedance matching of a Fabry–Perot cavity antenna to that of a wireless near-field link between two aperture-fed focusing devices. A remarkable agreement between full-wave simulations and numerical results is found in all cases. Thanks to its versatility, simplicity, and a rather low demand of computational resources, the proposed approach may become an essential tool for the effective design of waveguide-fed antennas.

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Innovative Application Contexts for Focusing Devices based on Leaky Waves

Negri,

Fuscaldo,

Burghignoli

et al. 2023

2023 IEEE International Workshop on Technologies for Defense and Security (TechDefense)

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Recent Advances in Beam Focusing through Resonant Bessel-Beam Launchers for Millimeter-Wave WPT Applications

Cited by 3 publications

References 20 publications

Design of TE-polarized resonant Bessel-beam launchers for wireless power transfer links in the radiative near-field region

Design of TE-polarized resonant Bessel-beam launchers for wireless power transfer links in the radiative near-field region

An efficient and accurate semi-analytical matching technique for waveguide-fed antennas

Innovative Application Contexts for Focusing Devices based on Leaky Waves

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