New CPW-fed monopole antennas with both linear and circular polarisations

Author

Wang, C.-J. ; Lin, Y.-C.

Author_Institution

Dept. of Electron. Eng., Nat. Univ. of Tainan, Tainan

Volume

2

Issue

5

fYear

2008

fDate

8/1/2008 12:00:00 AM

Firstpage

466

Lastpage

472

Abstract

A low-profile, planar, circularly polarised monopole antenna with a shorting sleeve strip fed using a coplanar-waveguide transmission line for wireless communication in the digital communication system and the global positioning system bands is studied. By utilising the coupling effect between the monopole antenna and sleeve, two excited resonant modes, including the monopole and travelling-wave modes, cover the 1.57- and 1.8-GHz bands. Through modification with antennas of various geometrical parameters, the proposed antenna exhibits the wide bandwidth in the desired frequency bands, which has a bandwidth of 45% at 1.6%GHz for an input reflection coefficient of less than %10%dB. Meanwhile, the antenna has a 3-dB axial ratio bandwidth of 5%. Details of the design considerations for the proposed antennas are described, and the results of the antenna performances obtained are presented and discussed.

Keywords

antenna feeds; coplanar transmission lines; coplanar waveguide components; digital communication; electromagnetic coupling; electromagnetic wave polarisation; monopole antennas; planar antennas; waveguide antennas; circular polarisation; coplanar-waveguide transmission line; coupling effect; digital communication system; frequency 1.57 GHz; frequency 1.8 GHz; geometrical parameter; global positioning system; linear polarisation; sleeve strip feed; wireless communication;

fLanguage

English

Journal_Title

Microwaves, Antennas & Propagation, IET

Publisher

iet

ISSN

1751-8725

Type

jour

DOI

10.1049/iet-map:20070145

Filename

4567157