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In recent years, cognitive radio system has been receiving particular attention as a promising technology in order to materialize efficient network access. In this paper, heightening upper limit frequency of the wideband antenna for cognitive radio system was investigated by employing three types of the antenna element variations. As a result, the antenna with the VSWR less than 2.0, employing asymmetrical...
Ultra wideband (UWB) technology draws attention as a promising technology in order to materialize ubiquitous network. However, it is difficult to obtain the ultra-wideband antenna that performs excellent over a broad frequency band from 3.1 GHz to 10.6 GHz in UWB radio communication. From a view point of cost, production, and miniaturization of devices, ultra-wideband antenna with a feeder line should...
In this paper, a half-sized unbalanced dipole antenna with fan-shaped and trapezoidal elements on a printed circuit board is proposed. The VSWR and radiation patterns of the proposed antenna were investigated. As a result, VSWR characteristics less than 2.0 and a relative bandwidth of 110 % over the frequency band of 3.1 GHz to 10.8 GHz were obtained from measurements. Radiation patterns similar to...
In recent years, Ultra wideband (UWB) technology has been drawing attention as a promising technology in order to materialize ubiquitous network [1]. UWB communications using a frequency range of 3.1 GHz to 10.6 GHz require a broadband antenna compared with antennas for conventional narrow band wireless communications. And, building the broadband antenna into electronic equipment is more difficult...
In recent years, wireless communications using Ultra Wideband (UWB) technology are promising in order to materialize the ubiquitous world what is called [1]. Antennas for UWB communications, using a frequency range of 3.1 GHz to 10.6 GHz, require suitable broadband characteristics as compared with antennas for conventional wireless communications.
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