A Helix Excited Circularly Polarized Hollow Cylindrical Dielectric Resonator Antenna

Author

Motevasselian, Alireza ; Ellgardt, A. ; Jonsson, B.L.G.

Author_Institution

Electromagn. Eng. Lab., KTH-R. Inst. of Technol., Stockholm, Sweden

Volume

12

fYear

2013

fDate

2013

Firstpage

535

Lastpage

538

Abstract

In this letter, we use a helix to excite two orthogonal HE_11δ modes in phase quadrature in a hollow cylindrical dielectric resonator antenna to generate circular polarization. As compared to our previous work, it is shown that replacing the cylindrical dielectric resonator antenna with a hollow cylindrical-shaped one leads to a significant enhancement in the 3-dB axial-ratio bandwidth. A design guideline is provided, and three design cases are presented. A prototype for one of the designs is fabricated and measured. Measured and simulated data are presented and discussed. It is shown that the 3-dB axial-ratio bandwidth increases as the wall thickness of the hollow cylindrical dielectric resonator decreases. Furthermore, a reduction in the wall thickness requires a longer helix exciter for similar performance .

Keywords

circular waveguides; dielectric polarisation; dielectric resonator antennas; axial-ratio bandwidth; circular polarization; gain 3 dB; helix excited circular polarized hollow cylindrical dielectric resonator antenna; orthogonal HE_11δ modes; phase quadrature; wall thickness; Circular polarization; dielectric resonator antenna (DRA); helix; hollow cylindrical; probe feed; ring;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2013.2257942

Filename

6497484