Superdirective radiation from finite gratings of rectangular grooves

Author

Skigin, Diana Carina ; Veremey, Vladimir V. ; Mittra, Raj

Author_Institution

Electromagn. Commun. Res. Lab., Pennsylvania State Univ., University Park, PA, USA

Volume

47

Issue

2

fYear

1999

fDate

2/1/1999 12:00:00 AM

Firstpage

376

Lastpage

383

Abstract

In this paper, the superdirective property of arrays comprising a finite number of rectangular grooves is studied by using the modal approach, which is a simple but powerful technique for analyzing these gratings. Numerical results show that when a specific characteristic mode of the structure referred to as the π mode is excited, the intensity of the field scattered in the specular direction exhibits a maximum, which becomes sharper and narrower as the number of grooves is increased. The far-field patterns exhibit superdirectivity at these resonant frequencies as evidenced by their beamwidths that are narrower than those expected from apertures of comparable size. The model-based parameter estimation (MBPE) technique has been employed to help locate extremely narrow resonances that are characteristic of superdirective arrays and its usefulness has been demonstrated

Keywords

antenna arrays; antenna radiation patterns; directive antennas; electromagnetic wave scattering; parameter estimation; π mode; MBPE technique; arrays; beamwidths; characteristic mode; extremely narrow resonances; far-field patterns; finite gratings; modal approach; model-based parameter estimation; rectangular grooves; resonant frequencies; specular direction; superdirective radiation; Antenna arrays; Apertures; Diffraction gratings; Electromagnetic diffraction; Electromagnetic scattering; Geometry; Parameter estimation; Resonance; Resonant frequency; Shape;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.761078

Filename

761078