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Off late, the demand for Broadband Internet Connection has been expanded. However, a lot of digital divide areas still exist. In these areas, the introduction of optical fiber and public wireless LAN is difficult in terms of profitability. As the countermeasure to these digital divide, the introduction of "Wireless LAN Mesh Networks" is under consideration in Japan in order to construct a wide wireless LAN at low cost. For this purpose, the antenna of a high directivity is necessary. As the directional antenna composed of wire elements, the Yagi-Uda antenna and the Electronically Steerable Passive Radiator (ESPAR) antenna are well known. These antennas consist of single driven element and some parasitic elements. These antennas are spatially phase controlled antennas.

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Format:PDFSize:226 KB
Date:Mar 2009
Pages:5

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