Summary
International Symposium on Antennas and Propagation
2008
Session Number:3C29
Session:
Number:3C29-1
Adaptive Antenna Composed of Six Dipole Elements for Wireless LAN
Mitsuo Taguchi, Tetsuya Yamashita,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
Recently, the demand for Broadband Internet Connection has been expanded and it becomes to be indispensable for the people’s lives. However, a lot of digital divide areas still exist in the rural areas in Japan. In these areas, the optical fiber and public wireless LAN is difficult to introduce in terms of the profitability. As the countermeasure to these digital divide, the introduction of "Wireless LAN Mesh Networks" has been discussed in Japan [1]. The authors have analyzed the adaptive antenna composed of six printed dipole elements for 2.4 GHz band wireless LAN [2]. Dipole elements are radially located and fed by parallel line printed on both sides of the dielectric substrate. The radiation pattern of this antenna is controlled by turning on/off switching diodes connected near feed points of six dipoles [3]. Since six dipoles elements are connected in parallel, however, the input impedance of this antenna varies depending on the number of excited elements. Therefore, the actual gain deteriorates when two or more elements are excited. In this paper, the adaptive antenna composed of six printed dipole elements with the varactor diode is proposed for improving its input impedance. The switching diode is installed near the feed point of each dipole element. The varactor diode is connected at the feed point of all elements. In the numerical analysis, the electromagnetic simulator "WIPL-D" based on the method of moment is used [4]．