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    Distortion analysis of indoor and outdoor limit with biconical antenna for ultra wideband system
    (2015-10-01)
    Deepunya, Chairak
    ;
    Promwong, Sathaporn
    The distortion of ultra wideband impulse radio (UWBIR) system that distorted by a channel due to antenna dispersion. This highly degrades of link budget performance. Therefore, to know the antenna characteristics, the effects of a waveform distortion, are necessary. The UWB transmission waveform is investigated by using extended Friis transmission formula based on UWB measurement data. This paper evaluates the performance system on transmission waveform distortion for UWB communication. The received signal and isotropic signal templates are considered with Friis formula. Mostly of radio wave propagation in link budget analytic performance is evaluated by using the Friis equation. Due to Friis equation is cannot directly apply for the UWB transmission waveform. For experimental evaluation scheme, using the broadband antenna for transmitter and receiver antennas (Tx and Rx). The full band 3.1 GHz to 10.6 GHz, which contributed by the Federal Communications Commission (FCC), is proposed as the UWB signal waveform. The transfer functions measured as experimental result by using the vector network analyzer for measuring and recording. This paper UWB transmission gains with the received signal and isotropic signal templates are shown and compared.
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    Performance evaluation scheme of ultra wideband impulse radio transmission
    (2010-07-30)
    Sereewattanapong, Thawatchai
    ;
    Promwong, Sathaporn
    Ultra wideband transmission waveform is investigated by using extended Friis' transmission formula baseded on experiment data. This paper, we consideration the performance system design on ultra wideband impulse radio (UWB-IR) system for personal area networks. The received signal and isotropic template receivers are considered based on Friis' transmission formula. In this experimental study, the biconical antennas are uesd as the transmitter (Tx) and the receiver (Rx) antennas. The rectangular passband, which is satisfied the full band of UWB signal definition and Federal Communications Commission (FCC) indoor and outdoor limit spectral masks, is used as the transmitted UWB signal. The channels are measured in an anechoic chamber by using a vector network analyzer (VNA). The relative gains of received signal and isotropic template receivers are shown and compared in results.
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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.