Resonant-cavity antennas are obtained by applying an Electromagnetic-Band Gap (EBG) superstrate at resonating distance from a primary feed backed by a metallic plate. The use of a traditional EBG makes the frequency response of the antenna extremely narrow bandwidth, unless an optimized EBG layout is designed for a high reflectivity over a wide frequency interval. A wideband EBG can be implemented as a one-dimensional multilayer, by alternating dielectric layers having a permittivity contrast, and including an air layer in between, thus conferring multiple resonances to the final structure. However, a limiting issue in this class of antennas is in the high sidelobe level, that is due to the small in-plane extension of the EBG, typically smaller or limited to two wavelengths, which leads to high edge diffraction. A grid realization of the EBG layers is proposed, through a tapered in-plane geometry of non-uniform holes. With this realization, the reflectivity of the EBG is reduced from the center to the edges, when the multilayer is used as superstrate of a truncated rectangular waveguide chosen as primary source. The fabrication of customized EBG layouts can be facilitated though 3D printing technique, in particular in the case of low-permittivity layers made in plastic materials, as PLA. Experimental measurements on the antenna prototype are reported for an RCA with a superstrate made of vetronite and PLA.

Ponti, C., Baccarelli, P., Ceccuzzi, S., Tognolatti, L., Schettini, G. (2021). Resonant-Cavity Antennas with Tapered and Wideband EBG Superstrates. In 2021 International Conference on Electromagnetics in Advanced Applications, ICEAA 2021 (pp.301-304). Institute of Electrical and Electronics Engineers Inc. [10.1109/ICEAA52647.2021.9539811].

Resonant-Cavity Antennas with Tapered and Wideband EBG Superstrates

Ponti C.;Baccarelli P.;Ceccuzzi S.;Tognolatti L.;Schettini G.
2021-01-01

Abstract

Resonant-cavity antennas are obtained by applying an Electromagnetic-Band Gap (EBG) superstrate at resonating distance from a primary feed backed by a metallic plate. The use of a traditional EBG makes the frequency response of the antenna extremely narrow bandwidth, unless an optimized EBG layout is designed for a high reflectivity over a wide frequency interval. A wideband EBG can be implemented as a one-dimensional multilayer, by alternating dielectric layers having a permittivity contrast, and including an air layer in between, thus conferring multiple resonances to the final structure. However, a limiting issue in this class of antennas is in the high sidelobe level, that is due to the small in-plane extension of the EBG, typically smaller or limited to two wavelengths, which leads to high edge diffraction. A grid realization of the EBG layers is proposed, through a tapered in-plane geometry of non-uniform holes. With this realization, the reflectivity of the EBG is reduced from the center to the edges, when the multilayer is used as superstrate of a truncated rectangular waveguide chosen as primary source. The fabrication of customized EBG layouts can be facilitated though 3D printing technique, in particular in the case of low-permittivity layers made in plastic materials, as PLA. Experimental measurements on the antenna prototype are reported for an RCA with a superstrate made of vetronite and PLA.
978-1-6654-1386-2
Ponti, C., Baccarelli, P., Ceccuzzi, S., Tognolatti, L., Schettini, G. (2021). Resonant-Cavity Antennas with Tapered and Wideband EBG Superstrates. In 2021 International Conference on Electromagnetics in Advanced Applications, ICEAA 2021 (pp.301-304). Institute of Electrical and Electronics Engineers Inc. [10.1109/ICEAA52647.2021.9539811].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/396317
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