Three Beam Switched Top Loaded Monopole Antenna

Naobumi MICHISHITA  Yuji NAKAYAMA  Hiroyuki ARAI  Kohei MORI  

IEICE TRANSACTIONS on Communications   Vol.E88-B   No.6   pp.2291-2296
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.6.2291
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
unidirectional antenna,  beam switched antenna,  top loaded monopole antenna,  planar antenna,  front to back ratio,  

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The three beam-switched top-loaded antenna is suited to be applied to a wireless local area network to switch the radiation pattern by arranging several unidirectional antennas. In this paper, a three beam switched top loaded monopole antenna is proposed to realize its small size and planar structure. Three top loaded monopole antennas are arranged around a parasitic hexagonal patch at intervals of 120 degrees. The feed element is selected by the switching device to switch the radiation pattern. This antenna allows for reduction in the number of elements as well as downsizing. The front to back ratio (F/B) becomes 23 dB by selecting suitable parameters.