A Compact ACS-Fed Tri-band Microstrip Monopole Antenna for WLAN/WiMAX Applications

A Rabia,C Mouloud,D Kahina,D Mokrane,M Faiza

doi:10.7716/aem.v7i5.853

Abstract

This paper proposes a novel small asymmetric coplanar strip (ACS) fed tri-band monopole antenna for WLAN and WiMAX applications. To tune and create multiple resonant frequencies, the exciting strip of monopole antenna is connected to two different arms which are a J-shaped directed toward the asymmetric ground plane and an open stub. The proposed monopole antenna with a total size of 14.6 x17.5 mm2 is fabricated and tested. The measured results indicate that the antenna has impedance bandwidths for 10-dB return loss reach about 500 MHz (2.01-2.52 GHz), 230 MHz (3.48-3.71 GHz) and 1.2GHz (5.59-6.72 GHz) which cover widely the 2.4/5.8 GHz WLAN bands and the 3.5GHz WiMAX band. The simulated radiation patterns of the proposed antenna at the three resonant frequencies have a dipole-like radiation pattern in both E-and H-Planes. The compact size, the simple structure and good radiation performances of the proposed antenna makes it well-suited forthe intended applications.

Highlights

The rapid size decrease of the electronic devices in the modern communication systems has given rise to an important demand to design miniaturized antennas
The antenna was a combination of a modified circular monopole antenna which produces wide bandwidth and a microstrip slot antenna which produces three resonant frequencies
The authors in [14] have proposed a compact uniplanar monopole antenna for tri-band operation. This antenna was loaded with two rectangular split ring resonator (SRR) etched on the radiating patch to achieve a tri-band resonant characteristic with a total size of 32 × 12mm2

Summary

Introduction

The rapid size decrease of the electronic devices in the modern communication systems has given rise to an important demand to design miniaturized antennas. The authors in [14] have proposed a compact uniplanar monopole antenna for tri-band operation This antenna was loaded with two rectangular SRRs etched on the radiating patch to achieve a tri-band resonant characteristic with a total size of 32 × 12mm. The reported antenna was comprised of an asymmetric ground plane, an ACS-fed structure, and coupled meandered monopole-type of radiating elements that are designed to provide the two desired operation bands with an overall size of 20 × 12mm.

Antenna Structure and Design

Fabrication And Measurement