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Author: search.filters.author.Promwong, SathapornSubject: search.filters.subject.Antenna

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    Wideband antenna performance evaluation for ultra wideband communication system
    (2018-07-02)
    Ruethorn, Issaree
    ;
    Promwong, Sathaporn
    The transmission loss in modern wireless communication systems is usually evaluate by Friis' formula. However, ultra wideband communication systems cannot apply its directly because the transmission waveform for the ultra wideband is difference from the other wireless communication systems. In this paper, the performance of the ultra wideband antenna with the measurement data of the transmission waveform based on Friis' formula and correlation receiver are presented. This scheme used to evaluate formula for the transmission waveform of the ultra wideband communication system. The distortion will be consider the receiver waveform and antenna should be known. Since the ultra wideband transmission waveform are pulse-shaping by the antenna, difference parameter of the antenna is investigated, especially the effect of the antenna performance and waveform template.
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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.