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The waveform of an Ultra WideBand Impulse Radio (UWB-IR) system can be extremely distorted through a channel even for free-space transmission because of antenna dispersion. Therefore, the understanding of antenna characteristics, which effects on waveform distortion, is necessary. This paper the authors evaluate the waveform distortion due to antenna on free space transmission in UWB-IR system. The link budget is usually evaluated by using the Friis' transmission formula. However, it is not directly applicable to the UWB-IR transmission system. The link budget evaluation formula attended from conventional Friis' transmission formula that takes into account the transmitted waveform, its distortion due to the antennas, the channel and the correlation receiver is proposed.
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