Backward cylindrical leaky waves radiating in the direction of their central axis represent an efficient solution for generating nondiffracting Bessel-like beams. The structures proposed so far to support such waves, constituted by concentric metal rings printed on a grounded dielectric slab, ensure the formation of nondiffractive field patterns with preset unchangeable configurations at a given frequency. Here, we propose the adoption of subwavelength spiral filaments with controlled patterning of the envelope figure by dynamic mechanical deformations, in order to achieve spatial tuning of the nondiffractive region in its size and shape. Precise guidelines and examples are provided to describe the proposed design technique and underline the inherent advantages of this alternative technological solution.

Spiral antennas for the generation of bessel beams with tunable nondiffractive range / Benedetti, A.; Fuscaldo, W.; Comite, D.; Tofani, S.; Baccarelli, P.; Galli, A.; Burghignoli, P.. - In: JOURNAL OF PHYSICS D. APPLIED PHYSICS. - ISSN 0022-3727. - 54:30(2021). [10.1088/1361-6463/abfc89]

Spiral antennas for the generation of bessel beams with tunable nondiffractive range

Benedetti A.;Comite D.;Tofani S.;Galli A.;Burghignoli P.
2021

Abstract

Backward cylindrical leaky waves radiating in the direction of their central axis represent an efficient solution for generating nondiffracting Bessel-like beams. The structures proposed so far to support such waves, constituted by concentric metal rings printed on a grounded dielectric slab, ensure the formation of nondiffractive field patterns with preset unchangeable configurations at a given frequency. Here, we propose the adoption of subwavelength spiral filaments with controlled patterning of the envelope figure by dynamic mechanical deformations, in order to achieve spatial tuning of the nondiffractive region in its size and shape. Precise guidelines and examples are provided to describe the proposed design technique and underline the inherent advantages of this alternative technological solution.
2021
Bessel-Gauss beams; diffraction; dynamic tuning; leaky-wave antenna; metasurface; spiral antenna
01 Pubblicazione su rivista::01a Articolo in rivista
Spiral antennas for the generation of bessel beams with tunable nondiffractive range / Benedetti, A.; Fuscaldo, W.; Comite, D.; Tofani, S.; Baccarelli, P.; Galli, A.; Burghignoli, P.. - In: JOURNAL OF PHYSICS D. APPLIED PHYSICS. - ISSN 0022-3727. - 54:30(2021). [10.1088/1361-6463/abfc89]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1556521
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