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In recent years, radio communication using ultrawideband (UWB) technology has shown great promise for healthcare and medical applications. Although many UWB antennas have been investigated and developed by several research institutes so far, it is difficult to find a loop type of antenna with broadband characteristics covering UWB frequency band. A loop antenna can be useful and effective component...
In recent years, radio communication using ultrawideband (UWB) technology has shown great promise for ubiquitous application. We have already investigated and developed the cross type of unbalanced dipole antenna with semicircular and trapezoidal radiating elements, and we have confirmed that the cross type of unbalanced dipole antenna performed with VSWR characteristics less than 2.0 over the UWB...
In recent years, ultra wideband (UWB) technology has been drawing attention as a promising technology in order to materialize ubiquitous network. The third-generation (3G) and the fourth-generation (4G) smartphones which employ the UWB technology have been hot. This study reports on a multiband antenna, which covers 800 MHz for 4G, 2.0 GHz for 3G and 3.1–10.6 GHz for UWB, built into such a smart phone...
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 drawn considerable attention as a promising option for the development of ubiquitous networks. In comparison with a conventional narrowband antenna system, the development of an electronic device with a built-in broadband antenna is more difficult because antenna performance must be ensured over the entire UWB frequency band. Previously, we proposed...
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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