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## Examples of Ultrawideband Definitions and Waveforms

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In the last fifteen years, the development of ultrawideband (UWB) electromagnetic (EM) systems in communications, radar, and high-power directed energy has been on the rise. In particular, the significant developments in the commercial sector of UWB communications systems and UWB radar for humanitarian de-mining have fueled strong interest in UWB systems and technologies. These developments have led to three similar yet significantly different definitions of UWB by the U.S. Federal Communications Commission (FCC) [1], the International Electrotechnical Commission (IEC) [2], and the U.S. Office of the Secretary of Defense and the Defense Advanced Research Projects Agency (OSD/DARPA) [3]. The differences between these definitions have created much discussion about establishing universal UWB definitions and standards. Consequently, after analyzing the differences and goals of the three categorization schemes, the authors created a new categorization scheme that merges many of the essential features of the earlier schemes in an effort to provide a common basis for discussing UWB waveforms, devices, and systems [4]. In this chapter, this merged scheme is used to compare and contrast a small set of ideal UWB waveforms.

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