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Author: search.filters.author.Promwong, SathapornSubject: search.filters.subject.UWB antenna

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    Wireless Body Area Network Transmission Model Based on Measurement Data
    (2018-08-21)
    Chaisang, Aditep
    ;
    Promwong, Sathaporn
    Wireless body area network (BAN) technology is becoming an increasingly important part of the human body communication system and short range applications. Characteristic of ultra wideband impulse radio (UWB-IR) channel propagation is very important. The human body is more complex than other applications. Therefore, to understand the characteristics of the channel distribution on the human body is so important. This paper presents characteristic of channel propagation due to effect within human body and without human body for wireless applications based on measurement data. The template waveform is considered at the receiver side to maximize the SNR for evaluation. In this paper, the results are evaluated based on the extended Friis' transmission formula. This technique gives very accurate results and is very useful for the design and evaluation of UWB transmission for wireless medical applications, especially focusing on the effect of template waveform.
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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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    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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    Optimum receiver evaluation of ultra wideband impulse radio based on measurements data
    (2011-12-01)
    Phroasamniang, Amphon
    ;
    Promwong, Sathaporn
    Ultra wideband impulse radio (UWB-IR) technology is an ideal candidate for wireless UWB that can be utilized for short-range, high-speed, low power, and low cost indoor applications. The transmission gain of the free space propagation loss is usually estimated by using Friis' transmission formula. The Friis formula, it is not directly applicable to ultra wideband impulse radio network transmission systems, in particular the single band impulse radio, as the formula is expressed as a function of the frequency. Moreover, the waveform may be distorted due to the frequency characteristics of the antenna, and the comparison between Tx and Rx waveforms is not straightforward. This paper discusses the free space link budget evaluation of UWB antenna with template receiver based on the extended Friis' transmission formula. The template is considered at the receiver side to maximize the SNR for evaluation. An experimental evaluation of the complex transfer function needs the three-antenna method for the calibration of reference antenna. The technique gives very accurate results and is very useful for design and evaluation of UWB transmission performance, especially for the evaluation of waveform distortion effects. © 2011 IEEE.