Bandwidth enhancement of stacked dielectric resonator antennas excited by a coaxial probe: an experimental and numerical investigation

Author

Rocha, H.H.B. ; Freire, F.N.A. ; Sohn, R.S.T.M. ; da Silva, Maria da Guia ; Santos, M.R.P. ; Junqueira, C.C.M. ; Cordaro, T. ; Sombra, A.S.B.

Author_Institution

Dept. de Eng. de Teleinformatica, Univ. Fed. do Ceara, Fortaleza

Volume

2

Issue

6

fYear

2008

Firstpage

580

Lastpage

587

Abstract

An experimental and numerical investigation about bandwidth enhancement of dielectric resonator antennas (DRAs) using multiple DRAs, arranged according to a ´stacked´ configuration is reported. The antenna consists of two cylindrical discs of the dielectrics Cr_0.75 Fe_1.25O₃ (CRFO) and Fe_0.5 Cu_0.75 Ti_0.75O₃ (FCTO) stacked vertically, placed above a ground plane and excited by a coaxial probe. The lateral edge of the cylinder should be placed against the feed probe, which excites the HEM_11delta mode. The numerical procedure is performed through a software package based on the finite-element method. An excellent agreement between theoretical and experimental results is observed. The concept of increasing the bandwidth of the DRA by stacking is verified. For the first time, the temperature coefficient of resonant frequency (T_f) was also measured for CRFO and FCTO ceramics.

Keywords

antenna arrays; antenna feeds; chromium compounds; copper compounds; dielectric resonator antennas; finite element analysis; iron compounds; CRFO ceramics; Cr_0.75Fe_1.25O₃; FCTO ceramics; Fe_0.5Cu_0.75Ti_0.75O₃; antenna feed; bandwidth enhancement; coaxial probe; finite-element method; multiple DRA; resonant frequency; software package; stacked dielectric resonator antenna; temperature coefficient;

fLanguage

English

Journal_Title

Microwaves, Antennas & Propagation, IET

Publisher

iet

ISSN

1751-8725

Type

jour

DOI

10.1049/iet-map:20070292

Filename

4607941