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International Journal of Antennas and Propagation
Volume 2012, Article ID 612170, 6 pages
http://dx.doi.org/10.1155/2012/612170
Research Article

Directive Microstrip Antennas for Specific Below −2.45 GHz Applications

1Área de Tecnología Electrónica, Universidad Miguel Hernández, Avenida Universidad s/n, 03202 Elche, Spain
2Department of Electronic Engineering, Universitat de València, Avenida Dr. Moliner 50, 46100 Burjassot, Spain

Received 29 November 2011; Accepted 29 January 2012

Academic Editor: Deb Chatterjee

Copyright © 2012 E. Ávila-Navarro and C. Reig. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Microstrip printed antennas are the preferred choice in high data ratio modern communications, mainly at 2.45 GHz and above. In this paper, we propose two different approaches of microstrip printed antennas for lower frequency usage. In this sense, we present a printed microstrip Yagi-like antenna at 868 MHz and a printed dipole log-periodic antenna for wider band applications. We focus on the use of low-cost substrates, with a good performance at these frequencies, and giving antennas with useful sizes for such applications. For the analysis, we make use of standard experimental characterization combined with full-wave 3D-FDTD specifically developed simulations. In this way, the S11, radiation patterns, and gain/efficiency figures are given.