Study on waveform distortion due to the antenna in ultra wideband impulse radio

A 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 understand of antenna characteristics, which effects on waveform distortion, is necessary. This paper studies the waveform distortion due to antenna on free space transmission in UWB-IR system. 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. Since the antennas are significant pulse-shaping filters in UWB-IR system, especially focused on the effect of the received signal and the isotropic template waveforms.