Leaky modes supported by a grounded wire-medium slab are studied here in detail for the first time. Such leaky modes are responsible for highly-directive radiation when the structure is excited by a dipole source. The analysis is carried out by means of a rigorous full-wave numerical approach based on the method-of-moments and also by using an approximate homogenized model. The use of a homogenized model that properly accounts for anisotropy and spatial dispersion leads to a remarkable and surprising result: the wavenumber of the leaky mode is independent of the azimuth angle of propagation on the surface. This result, which has not previously been observed in any other leaky-wave structure, allows for the creation of narrow conical beams that are azimuthally symmetric, as well as symmetric broadside beams. This conclusion is confirmed by the full-wave method-of-moments analysis.
Leaky modes on a grounded wire-medium slab / Burghignoli, Paolo; Lovat, Giampiero; F., Capolino; D. R., Jackson; D. R., Wilton. - ELETTRONICO. - (2007), pp. 1663-1666. (Intervento presentato al convegno 2007. IEEE/MTT-S International Microwave Symposium tenutosi a Honolulu (HI) nel 3-8 giugno 2007) [10.1109/MWSYM.2007.380025].
Leaky modes on a grounded wire-medium slab
BURGHIGNOLI, Paolo;LOVAT, GIAMPIERO;
2007
Abstract
Leaky modes supported by a grounded wire-medium slab are studied here in detail for the first time. Such leaky modes are responsible for highly-directive radiation when the structure is excited by a dipole source. The analysis is carried out by means of a rigorous full-wave numerical approach based on the method-of-moments and also by using an approximate homogenized model. The use of a homogenized model that properly accounts for anisotropy and spatial dispersion leads to a remarkable and surprising result: the wavenumber of the leaky mode is independent of the azimuth angle of propagation on the surface. This result, which has not previously been observed in any other leaky-wave structure, allows for the creation of narrow conical beams that are azimuthally symmetric, as well as symmetric broadside beams. This conclusion is confirmed by the full-wave method-of-moments analysis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
