Summary
International Symposium on Antennas and Propagation
2006
Session Number:3C1a
Session:
Number:3C1a-3
Dual-Frequency Mierostrip-Fed Basic-Structured Slot Antennas for Wireless LAN Applications
P. Wiriyacosol, N. Anantrasirichai, C. Benjangkaprasert, T. Wakabayashi,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
This study reported the techniques used in the design of microstrip-fed slot antennas for 2.40-2.4835 GHz (ISM) and 5.15-5.35 GHz(UNII) or 4.9-5.091 GHz band, which support Wireless LAN (Local Area Network) communications standardized by IEEE 802.11 b/g and a or h/j. Three basic-structured antenna configurations were investigated. The first antenna was a simple linear slot antenna designed to operate in dual-frequency range of both 2.40-2.4835 GHz and 5.15- 5.35 GHz band. The second antenna was an L-shaped slot antenna designed for 2.4-2.4835 GHz and 4.9-5.091 GHz band. The third antenna was a U-shaped slot antenna for 2.40-2.4835 GHz and 5.15-5.35 GHz. The effects of feeding position on the antenna characteristics were analyzed by Method of Moments (MOM), using IE3D commercial software from Zeland, Inc. The simulation result revealed that, the microstrip feed line position played a significant role in creating the dual-frequency support characteristics in an antenna. By selecting the appropriate position of the microstrip feed line dual-frequency characteristics were obtained for the three antennas investigated. For the simple linear slot antenna, further refinement was made by adjusting the microstrip feed length for optimum antenna characteristics. In the case of the L-shaped slot antenna. adjustment for optimum antenna response was performed on the ratio of the length of the vertical to the total arm length. For the U-shaped slot antenna, a further adjustment on the proportion of the vertical arm was needed to obtain the optimum design condition. The proposed dual-frequency antennas have covered the bandwidth with acceptable return loss, therefore, satisfied the design requirements.