Dual-Frequency Circularly-Polarized Patch Antenna With Compact Size and Small Frequency Ratio

Author

Bao, X.L. ; Ammann, M.J.

Author_Institution

Dublin Inst. of Technol., Dublin

Volume

55

Issue

7

fYear

2007

fDate

7/1/2007 12:00:00 AM

Firstpage

2104

Lastpage

2107

Abstract

A novel probe-fed single-layer annular-ring patch antenna for dual-frequency circular polarization is evaluated numerically and experimentally verified. The proposed antenna consists of a small circular patch surrounded by two concentric annular-rings, which is loaded by an unequal lateral cross-slot ground plane. The circularly-polarized frequency ratio of the two resonant modes is tunable to a small value, suitable for wireless communications systems. The patch size of the proposed antenna is reduced by about 53% compared to the conventional circular patch at a given frequency. The radiation characteristics of the novel antenna are also presented.

Keywords

antenna radiation patterns; electromagnetic wave polarisation; loop antennas; microstrip antennas; multifrequency antennas; annular-ring patch antenna; circularly-polarized patch antenna; concentric annular-rings; cross-slot ground plane; dual-frequency circular polarization; dual-frequency patch antenna; Antenna feeds; Antennas and propagation; Dual band; Geometry; Loaded antennas; Patch antennas; Polarization; Resonance; Resonant frequency; Wireless communication; Annular-ring patch; axial ratio; cross-slot; dual-band circular polarization antennas;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2007.900271

Filename

4267894