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Author: search.filters.author.Takada, Jun IchiSubject: search.filters.subject.Friis' transmission formula

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    Waveform distortion and transmission gain on ultra wideband impulse radio
    (2010-01-01)
    Promwong, Sathaporn
    ;
    Supanakoon, Pichaya
    ;
    Takada, Jun Ichi
    A waveform of an ultra wideband impulse radio (UWBIR) system can be extremely distorted through a channel even for free-space transmission because of antenna dispersion. This highly degrades the link budget performance. Therefore, the understand of antenna characteristics, which effects on waveform distortion, is necessary. This paper studies the waveform distortion due to antenna in 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. Since the antenna is significant pulse-shaping filters in UWB-IR system, the example kind of the log-periodic dipole antenna (LPDA) is experimentally examined, especially focused on the effect of the template waveforms. Copyright © 2010 The Institute of Electronics, Information and Communication Engineers.
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    Experimental study of UWB transmission antennas for short range wireless systems
    (2005-12-01)
    Promwong, Sathaporn
    ;
    Yingkajohn, Nisakorn
    ;
    Klomkarn, Kitdakorn
    ;
    Sithiyopaskul, Paisan
    ;
    Takada, Jun Ichi
    This paper present the transmission gain of UWB system based on the extended Friis' transmission formula. The template waveform is considered at the receiver side to maximize the SNR for evaluation. An experimental evaluation of the antenna transfer function needs the three types of broadband antennas. The technique gives very accurate results and is very useful for design and evaluation of UWB impulse radio transmission systems, especially for the evaluation of waveform distortion effects. © 2005 IEEE.