A Butterfly-Shaped Wideband Microstrip Patch Antenna for Wireless Communication

Liling Sun,Jingtao Hu,Hanning Chen,Yunlong Zhu,Maowei He

doi:10.1155/2015/328208

Abstract

A novel butterfly-shaped patch antenna for wireless communication is introduced in this paper. The antenna is designed for wideband wireless communications and radio-frequency identification (RFID) systems. Two symmetrical quasi-circular arms and two symmetrical round holes are incorporated into the patch of a microstrip antenna to expand its bandwidth. The diameter and position of the circular slots are optimized to achieve a wide bandwidth. The validity of the design concept is demonstrated by means of a prototype having a bandwidth of about 40.1%. The return loss of the butterfly-shaped antenna is greater than 10 dB between 4.15 and 6.36 GHz. The antenna can serve simultaneously most of the modern wireless communication standards.

Highlights

Microstrip patch antennas have found many applications in wireless communication systems because of their properties as low profile, light weight, low cost, and easy fabrication [1]
It can be noticed that the antenna has sufficient bandwidth to cover the requirement of the radiofrequency identification (RFID) systems and the wireless computer networks
The return loss is greater than 10 dB from 4.15 to 6.36 GHz (40.1% bandwidth)

Summary

Introduction

Microstrip patch antennas have found many applications in wireless communication systems because of their properties as low profile, light weight, low cost, and easy fabrication [1]. Various methods have been accomplished to improve the bandwidth of microstrip antennas These methods include the adoption of thick substrates, the employment of parasitic elements, either in coplanar or stack configuration, the shaping of the radiant patch, or the inclusion of suitable slots. This last approach is attractive because it can provide excellent bandwidth improvement maintaining a single-layer radiating structure to preserve the antenna’s low characteristic profile. High-speed wireless computer networks have attracted the attention of researchers, especially in the 56 GHz band This band can cover the frequencies of the high-speed wireless computer networks (e.g., IEEE 802.11a) [16] and the RFID UHF band in North America [17].

Rin2 Rout2

Antenna Geometry

Results and Discussion

Conclusion