A multi-fed radially periodic two-dimensional leaky-wave antenna is proposed for the generation of a directional beam continuously scanning in elevation by changing the frequency, and over a discrete number of directions in azimuth when activating different elements of the feeding system. The structure is planar and constituted by a circular grounded dielectric slab loaded with microstrip rings, properly positioned around the sources to support the propagation of an angularly directional surface wave over a sector determined by the corresponding activated feeder. This produces a perturbation of the surface wave, resulting in the generation of a directional leaky wave over the aperture, whose complex propagation constant is described by a single fast backward spatial harmonic. The antenna radiation features are numerically investigated in conjunction with the dispersion analysis of the structure, validated through a conventional generalized-pencil-of-function approach. Full-wave simulations have been developed to design a practical feeder, which is constituted by a circular arrangement of commercial coaxial connectors. The proposed multi-port antenna is validated by means of measurements performed on a microwave manufactured prototype. The design represents an attractive simple and cost-effective solution to achieve a high-gain beam scanning over the three-dimensional space, alternative to more conventional phased-array design based on cumbersome and lossy feeding networks.

Comite, D., Kuznetcov, M., Buendia, V.G.-., Podilchak, S.K., Baccarelli, P., Burghignoli, P., et al. (2021). Directive 2-D beam steering by means of a multi-port radially periodic leaky-wave antenna. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 69(5), 2494-2506 [10.1109/tap.2020.3030994].

Directive 2-D beam steering by means of a multi-port radially periodic leaky-wave antenna

Baccarelli P.;
2021

Abstract

A multi-fed radially periodic two-dimensional leaky-wave antenna is proposed for the generation of a directional beam continuously scanning in elevation by changing the frequency, and over a discrete number of directions in azimuth when activating different elements of the feeding system. The structure is planar and constituted by a circular grounded dielectric slab loaded with microstrip rings, properly positioned around the sources to support the propagation of an angularly directional surface wave over a sector determined by the corresponding activated feeder. This produces a perturbation of the surface wave, resulting in the generation of a directional leaky wave over the aperture, whose complex propagation constant is described by a single fast backward spatial harmonic. The antenna radiation features are numerically investigated in conjunction with the dispersion analysis of the structure, validated through a conventional generalized-pencil-of-function approach. Full-wave simulations have been developed to design a practical feeder, which is constituted by a circular arrangement of commercial coaxial connectors. The proposed multi-port antenna is validated by means of measurements performed on a microwave manufactured prototype. The design represents an attractive simple and cost-effective solution to achieve a high-gain beam scanning over the three-dimensional space, alternative to more conventional phased-array design based on cumbersome and lossy feeding networks.
Comite, D., Kuznetcov, M., Buendia, V.G.-., Podilchak, S.K., Baccarelli, P., Burghignoli, P., et al. (2021). Directive 2-D beam steering by means of a multi-port radially periodic leaky-wave antenna. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 69(5), 2494-2506 [10.1109/tap.2020.3030994].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/376572
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