Near-Field Focusing by Non-diffracting Bessel Beams

Ettorre, Mauro; Pavone, Santi C.; Casaletti, Massimiliano; Albani, Matteo; Mazzinghi, Agnese; Freni, A.

doi:10.1007/978-3-319-62773-1_8

Cited by 46 publications

(27 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finite equivalent magnetic current distribution of radius a, shaped as a zeroth order first kind Hankel function, and polarized along an arbitrary fixed polarization unit vectorp. decade different advanced approaches (i.e., holography [22], [23], leaky-wave theory applied to focusing [23], [24], etc.) have been profitably adopted for planar Bessel beam launcher design.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Bessel Beam Launchers: Transverse Polarization

Pavone

Ettorre

Casaletti³

et al. 2021

IEEE Trans. Antennas Propagat.

Self Cite

View full text Add to dashboard Cite

In this paper, we present a theoretical analysis, one design and fabrication of a limited-diffractive planar Bessel beam launcher, that exhibits a zeroth order Bessel profile in the transverse electric field component with respect to the zpropagation axis. The launcher is designed by synthesizing a finite zeroth order, first kind Hankel aperture distribution, polarized along a fixed polarization unit vector. The field radiated by such an aperture distribution is derived by following an approximate model based on geometric theory of diffraction, thus allowing to highlight the relevant wave constituents involved in transverse Bessel beam generation, also including the effect of aperture truncation on the radiated beam. Moreover, the theoretical analysis has been profitably applied to the design of a circularpolarized planar transverse Bessel beam launcher by means of a slotted radial waveguide. A prototype of right-handed circular polarized (RHCP) transverse Bessel beam launcher has been then fabricated at f = 30 GHz. The measured transverse electric field component shows a satisfactory agreement with full-wave numerical simulations.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Bessel Beam Launchers: Transverse Polarization

Pavone

Ettorre

Casaletti³

et al. 2021

IEEE Trans. Antennas Propagat.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Consequently, these findings do not generally apply at microwave frequencies where the fully vectorial nature of the electromagnetic fields has to be taken into account. This difficulty initially hindered the microwave generation of Bessel beams that only appeared for the first time in the last decade [9]. Nonetheless, while BBs are now widespread at microwaves (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, while BBs are now widespread at microwaves (see, e.g. [9] and refs. therein) BGBs have been discussed only recently on a rigorous theoretical basis [10] (although the benefits arising from the application of amplitude tapering functions on the aperture distribution were yet highlighted in [11]).…”

Section: Introductionmentioning

confidence: 99%

Microwave synthesis of Bessel, Bessel–Gauss, and Gaussian beams: a fully vectorial electromagnetic approach

Fuscaldo

Benedetti

Comite

et al. 2021

Int. J. Microw. Wireless Technol.

View full text Add to dashboard Cite

Bessel, Bessel-Gauss, and Gaussian beams have widely been investigated in optics in the paraxial approximation, under the frame of a scalar wave theory. Such approximations can hardly be applied in the microwave/millimeter-wave range, where the vectorial nature of the electromagnetic fields cannot be neglected, and experimental realizations for some of these beams appeared only recently. In this work, we discuss the generation of Bessel, Bessel-Gauss, and Gaussian beams through a fully vectorial electromagnetic approach. The field derivation of all these beams is first illustrated and numerical evaluations are then reported to compare their different propagation and diffractive behaviors. Finally, an innovative approach for realizing such solutions with planar microwave devices exploiting leaky waves is demonstrated through accurate numerical simulations.

show abstract

“…Leaky-wave (LW) and modulated-impedance surface antennas have also been proposed and experimentally demonstrated to generate desired focal spots [18][19][20][21][22][23][24][25][26][27][28][29]. Their operation is based on gradual perturbation of a guided mode to form converging leaky modes that interfere constructively at a focal spot.…”

Section: Introductionmentioning

confidence: 99%

Efficient Holographic Focusing Metasurface

Gowda¹,

Imani²,

Sleasman³

et al. 2021

Electronics

View full text Add to dashboard Cite

We present the design and experimental demonstration of an efficient holographic metasurface aperture that focuses microwaves in the Fresnel zone. The proposed circular structure consists of two stacked plates with their periphery terminated in a conductive layer. Microwaves are injected into the bottom plate, which forms the feed layer, and are coupled to the top holographic metasurface layer via an annular ring. This coupling results in an inward traveling cylindrical wave in the top layer, which serves as the reference wave for a hologram. The radiating elements consist of a slot pair with their orientations designed to couple efficiently with the cylindrical reference wave while maintaining a linearly polarized focused beam. A general condition on the slot pairs radiated power is proposed to ensure low sidelobe level (SLL) and is validated with full-wave simulation. An aperture that is 20 cm in diameter, operates at 20 GHz in the K-band frequency, and forms a diffraction-limited focal spot at a distance of 10 cm is experimentally demonstrated. The proposed near-field focusing metasurface has high antenna efficiency and can find application as a compact source for Fresnel-zone wireless power transfer and remote sensing schemes.

show abstract

Near-Field Focusing by Non-diffracting Bessel Beams

Cited by 46 publications

References 62 publications

Analysis and Design of Bessel Beam Launchers: Transverse Polarization

Analysis and Design of Bessel Beam Launchers: Transverse Polarization

Microwave synthesis of Bessel, Bessel–Gauss, and Gaussian beams: a fully vectorial electromagnetic approach

Efficient Holographic Focusing Metasurface

Contact Info

Product

Resources

About