Directivity Enhancement and Spurious Radiation Suppression in Leaky-Wave Antennas Using Inductive Grid Metasurfaces

Blanco, Darwin; Rajo-Iglesias, Eva; Maci, Stefano; Llombart, Nuria

Abstract

Fabry-Perot antennas (FPA) achieve high broadside directivity due to the simultaneous excitation of a pair of nearly degenerate TE/TM leaky-wave modes using a partially-reflecting surface on top of a ground plane. This partially-reflecting surface can be obtained using a dielectric superstrate or via a capacitive or inductive metasurface (MTS). By using an equivalence between the conventional dielectric superstrate and the MTS-based structures in terms of the dominant TE/TM modes, we show that the use of inductive grid MTSs leads to a directivity enhancement. A higher roll-of in the radiation patterns is achieved as a result of the intrinsic suppression of the spurious leaky wave mode. This suppression is mathematically demonstrated and validated with full-wave simulations. The achieved improvement in more than 1 dB for inductive strip grid based MTS with respect to dielectric based super-layers, for the same frequency band of 2.5%, is verified with measurements. Two prototypes, with the dielectric superlayer and inductive strip grid based MTS, have been fabricated and measured supporting the claim of this work.

Más información

Título según WOS: ID WOS:000351087800002 Not found in local WOS DB
Título de la Revista: IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volumen: 63
Número: 3
Editorial: IEEE COMMUNICATIONS SOCIETY
Fecha de publicación: 2015
Página de inicio: 891
Página final: 900
DOI:

10.1109/TAP.2014.2387422

Notas: ISI