Analysis of directive radiation from a line source in a metamaterial slab with low permittivity

By G. Lovat, P. Burghignoli, Filippo Capolino, David R. Jackson, D. R. Wilton. IEEE Transactions on Antennas and Propagation, 2006

181 citations recorded by the source corpus.

In this paper an investigation is presented of metamaterial structures excited by a line source aimed at producing narrow directive beams. The structure under consideration is a grounded slab made of a homogeneous metamaterial medium with a plasma-like dispersive permittivity; for low values of the slab permittivity an extremely directive beam pointing at broadside can be obtained. Conditions for the maximization of radiation at broadside are given and the narrow-beam effect is shown to be related to the excitation of a leaky mode supported by the slab, with radiation maximization corresponding to small and equal values of the phase and attenuation constants. The frequency bandwidth and directivity are expressed in a simple closed form in terms of the attenuation constant of the leaky mode. By increasing the slab height for a fixed frequency, the leaky mode is analytically shown to give rise to a beam that is scanned from broadside to the critical angle for plane-wave refraction, thus being confined to a narrow angular region around broadside. Numerical results are given that illustrate these features, and full-wave simulations of a metamaterial structure made of an array of metallic cylinders are presented that confirm the results of the analytical study. The case of a line source inside a semi-infinite metamaterial region is also considered and its radiation characteristics compared with those of the metamaterial slab

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/44cf12021da1d94d8e1c27b251ab1117e32533d8

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Citations in the corpus

Leaky-Wave Antennas (2008, background): “7(b) shows another type of structure, where an artificial low-permittivity grounded substrate layer is realized by using a wire medium [23].”
Array thinning by using antennas in a Fabry-Perot cavity for gain enhancement (2006, background): “However the basic principle that produces the enhanced directivity is still based on the excitation of leaky waves as it has been shown in [2], [31], [32].”
A Novel High-Directivity Microstrip Patch Antenna Based on Zero-Index Metamaterial (2009, background): “Many groups have realized low/zero-index metamaterials (LIM/ZIM) through experiments [5], [6].”