Miniature multi-band monopole antenna using spiral ring resonators for radiation pattern characteristics improvement

Author

Wan, Yang-Tao ; Yu, Daren ; Zhang, F.-S. ; Zhang, Fang

Author_Institution

Nat. Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi´an, China

Volume

49

Issue

6

fYear

2013

fDate

March 14 2013

Firstpage

382

Lastpage

384

Abstract

A compact coplanar waveguide (CPW)-fed multi-band monopole antenna loaded with spiral ring resonators is presented. The proposed antenna consists of two spiral ring strips which are printed on the different sides of the substrate and connected through a via-hole. The size of the miniaturised antenna is only about 27.5 × 20 × 1 mm³. The proposed antenna can excite multi-resonant modes close to the 2.5/3.5/5.5 GHz bands to meet the specifications of the worldwide interoperability for microwave access (WiMAX) system. By introducing the spiral ring structure, very good radiation pattern characteristics can be obtained. With a figure-of-eight pattern in the E-plane and omnidirectional pattern in the H-plane, measured peak gains are about 2.0/2.23/2.58 dBi at the 2.5/3.5/5.5 GHz operating bands, respectively.

Keywords

WiMax; antenna radiation patterns; coplanar waveguides; microwave antennas; microwave resonators; monopole antennas; multifrequency antennas; omnidirectional antennas; strips; CPW-fed multiband monopole antenna; E-plane; H-plane; WiMAX system; compact coplanar waveguide-fed multiband monopole antenna; figure-of-eight pattern; frequency 2.5 GHz; frequency 3.5 GHz; frequency 5.5 GHz; multiresonant modes; omnidirectional pattern; peak gain measurement; radiation pattern characteristics improvement; spiral ring resonators; spiral ring strips; spiral ring structure; via-hole; worldwide interoperability for microwave access system;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2012.3980

Filename

6485047