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This paper describes the wideband limitation of planar rectangular disc antennas and its downsizing limitation. Here, planar rectangular disc antennas such as a card type antenna are considered. The card antenna is composed of metal pieces and is designed by using Genetic Algorithm. On the basis of the parameter study, the limitations of the relative bandwidth and the lowest frequency of such antennas...
Wireless broadband communications such as UWB, WiMAX et. al. have been put into services in Japan, in order to realize high-speed transmission systems. Such a system enables to transmit movies from a person to the other person in the winking of an eye. To realize such wireless broadband communications, wideband antennas have been required. This paper describes the bandwidth limitations of ultra-wideband...
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