Analysis of surface-wave excitation and radiation mechanisms of a monopole on a circular grounded dielectric slab with critical thickness

Author

Maci, S. ; Raffaelli, S. ; Leoncini, M. ; Borselli, L. ; Kildal, P-.S

Author_Institution

Dept. of Electron. Eng., Florence Univ., Italy

Volume

143

Issue

4

fYear

1996

fDate

8/1/1996 12:00:00 AM

Firstpage

335

Lastpage

340

Abstract

The properties of a monopole antenna on a circular, dielectric-loaded ground plane are analysed by using the finite-difference time-domain (FDTD) technique. The thickness of the dielectric slab has been chosen to maximise the decay of the space-wave contribution at grazing, thus reducing the space-wave diffraction at the truncation. This permits realisation of a low-side/back-lobe antenna provided that the spurious diffraction of the dominant TM surface wave is properly blocked. The radiation pattern of the antenna is similar to that of a monopole on an artificially soft (corrugated) disc. The accuracy of the FDTD prediction is tested by comparisons with far-field measurements and a moment-method analysis

Keywords

antenna radiation patterns; dielectric-loaded antennas; electromagnetic wave diffraction; finite difference time-domain analysis; monopole antennas; FDTD accuracy; FDTD technique; TM surface wave; artificially soft disc; circular grounded dielectric slab; corrugated disc; critical thickness; dielectric loaded ground plane; far field measurements; finite difference time-domain; grazing; low backlobe antenna; low sidelobe antenna; moment method analysis; monopole antenna; radiation pattern; space wave decay; space wave diffraction; spurious diffraction; surface wave excitation; surface wave radiation; truncation;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:19960364

Filename

533196