General Information
    • ISSN: 1793-821X
    • Frequency: Quarterly (2013-2014); Bimonthly (Since 2015)
    • DOI: 10.18178/JOCET
    • Editor-in-Chief: Prof. Haider F. Abdul Amir
    • Executive Editor: Ms. Julia S. Ma
    • Abstracting/ Indexing: EI (INSPEC, IET), Electronic Journals Library, Chemical Abstracts Services (CAS), Ulrich's Periodicals Directory, Google Scholar, ProQuest and DOAJ.
    • E-mail: jocet@ejournal.net
  • Jun 12, 2016 News! JOCET Vol.3, No.5 has been indexed by EI(Inspec)!   [Click]
  • Jun 13, 2017 News! JOCET Vol. 5, No. 4 is available online now. 15 papers which cover 4 specific areas are published in this issue.   [Click]
Editor-in-chief
School of Science and Technology Universiti Malaysia Sabah, Malaysia.
I would like to express my appreciation to all authors, reviewers and edtors.
JOCET 2014 Vol.2(4): 339-342 ISSN: 1793-821X
DOI: 10.7763/JOCET.2014.V2.151

Radiation Characteristics of a Quarter-Wave Monopole Antenna above Virtual Ground

Niazul Islam Khan, Anwarul Azim, and Shadli Islam
Abstract—In recent years, monopole antennas have become one of the vital components of cellular mobile communications and internet networks across the globe. Their relatively easy and low fabrication cost and faster installation makes them an obvious choice for developing countries. The most common form is the quarter-wave monopole, in which the antenna is approximately 1/4 of a wavelength of the radio waves. In this paper, we present the analytical treatment of a quarter-wave monopole antenna above virtual ground. Virtual ground is realized by using bent radials around the vertical monopole element. Radiation resistance and gain of the quarter-wave monopole are mathematically derived and three-dimensional radiation patterns are simulated using sinusoidal current distribution. It is observed that for the case of the quarter-wave monopole, we achieve twice the gain of a dipole antenna of half-wave-length long. As the radiated power is limited to upper hemisphere of the ground plane, the total radiated power of the quarter-wave monopole is half of that of a dipole. Hence, the value of radiation resistance of the monopole is half of that of a dipole.

Index Terms—Ground plane, radiation pattern, directivity, half-wave dipole, monopole antenna.

Niazul Islam Khan and Anwarul Azim are with the Electrical and Electronic Engineering Department, East West University, Dhaka, Bangladesh (e-mail: niazulislam@ewubd.edu, azim@ewubd.edu).
Shadli Islam is with the Electrical and Electronic Engineering Department, Khulna University of Engineering and Technology, Khulna, Bangladesh (e-mail: ishad_29@yahoo.com).

[PDF]

Cite:Niazul Islam Khan, Anwarul Azim, and Shadli Islam, "Radiation Characteristics of a Quarter-Wave Monopole Antenna above Virtual Ground," Journal of Clean Energy Technologies vol. 2, no. 4, pp. 339-342, 2014.

Copyright © 2008-2016. Journal of Clean Energy Technologies. All rights reserved.
E-mail: jocet@ejournal.net