In this work, one-dimensional and two-dimensional leaky-wave antennas based on planar structures are considered, aimed at producing narrow directive beams pointing at broadside. A comparative analysis is presented of different classes of radiators, namely, conventional grounded slabs covered with metallic or dielectric partially-reflecting surfaces, and metamaterial grounded slabs with very low values of permittivity or permeability. The antenna performance is expressed in terms of enhancement of broadside power density with respect to free space, of broadside directivity, and of the relevant frequency bandwidth, as a function of the attenuation constant of the involved leaky modes. The latter is in turn related to the antenna structural parameters, in order to ascertain advantages and drawbacks of the various structures. Numerical full-wave results for antennas excited by printed dipoles are provided.
A comparative study of conventional and metamaterial-based planar leaky-wave antennas for directive radiation at broadside / Lovat, Giampiero; Burghignoli, Paolo; F., Capolino; D. R., Jackson; D. R., Wilton. - ELETTRONICO. - (2005), pp. 1-4. (Intervento presentato al convegno 28th General Assembly of the International Union of Radio Science tenutosi a New Delhi, India nel 23-29 October 2005).
A comparative study of conventional and metamaterial-based planar leaky-wave antennas for directive radiation at broadside
LOVAT, GIAMPIERO;BURGHIGNOLI, Paolo;
2005
Abstract
In this work, one-dimensional and two-dimensional leaky-wave antennas based on planar structures are considered, aimed at producing narrow directive beams pointing at broadside. A comparative analysis is presented of different classes of radiators, namely, conventional grounded slabs covered with metallic or dielectric partially-reflecting surfaces, and metamaterial grounded slabs with very low values of permittivity or permeability. The antenna performance is expressed in terms of enhancement of broadside power density with respect to free space, of broadside directivity, and of the relevant frequency bandwidth, as a function of the attenuation constant of the involved leaky modes. The latter is in turn related to the antenna structural parameters, in order to ascertain advantages and drawbacks of the various structures. Numerical full-wave results for antennas excited by printed dipoles are provided.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
