This paper addresses the beam shaping by means of Electromagnetic Band Gap (EBG) materials operating at the edge of the forbidden band, i.e., where some lattice modes can propagate. Unlike classical resonator antennas, where the primary source is located in a cavity made of a ground plane and an EBG working in the band gap, 'lattice mode' antennas embed the primary source in the periodic structure. Owing to this feature, the position of the source inside the unit cell of the periodic structure comes out to play a pivotal role in shaping the radiation outside the EBG because it determines which lattice modes are excited and to which extent. This mechanism is exploited here to attain two different radiation patterns through the same dielectric EBG structure by placing two primary sources in different positions. Such positions allow each source to excite one out of two degenerate lattice modes and to be almost invisible to the other one, thus entailing a good decoupling between feeding antennas despite their proximity.
Ceccuzzi, S., Baccarelli, P., Ponti, C., Schettini, G. (2019). Recent advances on dielectric EBGs for directive antennas. In Proceedings of the 2019 21st International Conference on Electromagnetics in Advanced Applications, ICEAA 2019 (pp.937-940). Institute of Electrical and Electronics Engineers Inc. [10.1109/ICEAA.2019.8878961].
Recent advances on dielectric EBGs for directive antennas
Ceccuzzi S.;Baccarelli P.;Ponti C.;Schettini G.
2019-01-01
Abstract
This paper addresses the beam shaping by means of Electromagnetic Band Gap (EBG) materials operating at the edge of the forbidden band, i.e., where some lattice modes can propagate. Unlike classical resonator antennas, where the primary source is located in a cavity made of a ground plane and an EBG working in the band gap, 'lattice mode' antennas embed the primary source in the periodic structure. Owing to this feature, the position of the source inside the unit cell of the periodic structure comes out to play a pivotal role in shaping the radiation outside the EBG because it determines which lattice modes are excited and to which extent. This mechanism is exploited here to attain two different radiation patterns through the same dielectric EBG structure by placing two primary sources in different positions. Such positions allow each source to excite one out of two degenerate lattice modes and to be almost invisible to the other one, thus entailing a good decoupling between feeding antennas despite their proximity.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
