Design of Triple-Frequency Microstrip-Fed Monopole Antenna Using Defected Ground Structure

Author

Liu, Wen-Chung ; Wu, Chao-Ming ; Dai, Yang

Author_Institution

Dept. of Aeronaut. Eng., Nat. Formosa Univ., Huwei, Taiwan

Volume

59

Issue

7

fYear

2011

fDate

7/1/2011 12:00:00 AM

Firstpage

2457

Lastpage

2463

Abstract

A novel triple-frequency microstrip-fed planar monopole antenna for multiband operation is proposed and investigated. Defected ground structure (DGS) is used in this antenna, which has a rectangular patch with dual inverted L-shaped strips and is fed by a cross-shaped stripline, for achieving additional resonances and bandwidth enhancements. The designed antenna has a small overall size of 20 × 30 mm², and operates over the frequency ranges, 2.14-2.52 GHz, 2.82-3.74 GHz, and 5.15-6.02 GHz suitable for WLAN 2.4/5.2/5.8 GHz and WiMAX 3.5/5.5 GHz applications. There is good agreement between the measured and simulated results. Experimental results show that the antenna gives monopole-like radiation patterns and good antenna gains over the operating bands. In addition, effects of both the length of the protrudent strips and the dimensions of the DGS for this design on the electromagnetic performance are examined and discussed in detail.

Keywords

WiMax; antenna feeds; antenna radiation patterns; defected ground structures; microstrip antennas; monopole antennas; multifrequency antennas; planar antennas; strip lines; wireless LAN; WLAN applications; WiMAX applications; bandwidth enhancements; cross-shaped stripline; defected ground structure; dual inverted L-shaped strips; electromagnetic performance; frequency 2.14 GHz to 2.52 GHz; frequency 2.82 GHz to 3.74 GHz; frequency 5.15 GHz to 6.02 GHz; monopole-like radiation patterns; multiband antenna; protrudent strips; triple-frequency microstrip-fed planar monopole antenna; Antenna measurements; Bandwidth; Frequency measurement; Microstrip antennas; Resonant frequency; Strips; Defected ground structure; WLAN; WiMAX; monopole antenna; multi-band; triple-frequency;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2011.2152315

Filename

5765454