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Author: search.filters.author.Promwong, SathapornSubject: search.filters.subject.ultra wideband (UWB)

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    Experimental evaluation of UWB human body transmission model for WBAN
    (2016-09-06)
    Teawchim, Sanit
    ;
    Promwong, Sathaporn
    This paper presents experimental evaluation of UWB human body transmission model for WBAN. The human body is more complex and many side than other application. Therefore, to understand human body channel is so important. The root raise cosine passband waveform is used as UWB transmitted waveform. The channels model is classified with body mass index. The body channel transfer functions on human body are measured by using vector network analyzer (VNA) at frequency 3 GHz to 5 GHz. The path loss model is show compared of average power loss and peak power loss. The results are discussed in conclusion.
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    Experimental study of ultra wideband human body channel
    (2016-09-06)
    Teawchim, Sanit
    ;
    Southisombath, Phouthong
    ;
    Promwong, Sathaporn
    This paper a study of UWB human body channel. The human body is more complex than other application. Therefore, to understand human body channel is so important. The analysis is based on the extension Friis' transmission formula that uses to characterize the WBAN channel transfer function. The rectangular passband waveform is used as UWB transmitted waveform. The channels of 5 positions on human body are measured by using vector network analyzer (VNA). The frequency channel transfer functions, power delay profile (PDP) and path loss are shown. The results are discussed in conclusion.
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    Evaluation of antennas performance with FCC and common spectral mask for UWB localization
    (2015-01-26)
    Kingsakda, Vongkeo
    ;
    Satahack, Phonepaseuth
    ;
    Mingmanee, Sirapop
    ;
    Promwong, Sathaporn
    Antennas which are used to transmit and receive ultra wideband impulse radio (UWB-IR) signals should be able to accomodate its large bandwidth. Moreover, the signals should not be distorted too much when they pass through the antennas. Therefore, the transfer function of antennas should be known the performance. The indoor and the outdoor localization are usually evaluated by using the extension of Friis' transmission formula. However, it is not directly application to UWB transmission systems. This paper are presentation, the characterization of UWB antennas performance that takes into account the transmission signal waveform, its distortion due to the antennas, and the receiver. Since the antennas are significant pulse-shaping filters in UWB, various kinds of antennas are experimentally examined, especially focusing on the UWB template waveform.
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    Comprehensive characterization of a novel UWB elliptical planar monopole antenna
    (2012-12-01)
    Marindra, Adi Mahmud Jaya
    ;
    Promwong, Sathaporn
    ;
    Takada, Jun Ichi
    The rise of research in ultra wideband (UWB) antenna design must be followed by a proper method of antenna characterization. The emerging concept of UWB impulse radio (UWB-IR) compels the performance evaluation of UWB antenna should be assessed in different ways from narrowband antennas. In this paper, a comprehensive characterization of UWB antenna will be discussed. Based on the theory of antenna transfer function in frequency domain, some UWB transmission parameters in time domain are derived, i.e. waveform correlation, waveform width stretch ratio, and waveform relative gain. For practical testing, we propose a novel UWB elliptical planar monopole antenna as the characterized antenna. The results show that the overall performance and characteristic of the proposed antenna is very good, especially at the antenna boresight. The derived parameters can quantitatively characterize the UWB antenna for all the measured directions so that the detail of transmission performance of the UWB antenna could be known. Hopefully, the characterization scheme with the proposed antenna presented in this paper provide useful insight either for UWB antenna design or for evaluating UWB antenna performance. © 2012 IEEE.