Promwong, Sathaporn

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Promwong, Sathaporn
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Promwong, S.
Promwong, Sathapom
Promwong, Sathapotn
Promwong, Sathapron
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sathaporn.pr@kmitl.ac.th

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    Experimental study for polarimetric measurement of RFID transfer function with in an indoor environment
    (2009-12-01)
    Duangsuwan, S.
    ;
    Leukachorn, T.
    ;
    Chinsawatpan, S.
    ;
    Promwong, S.
    Radio Frequency Identification (RFID), is unlicensed industrial, scientific, and medical (ISM) band at 2.4 GHz. The same principle as that used in long-range radio communication links. The reader's antenna generates a propagating radio wave use far-field communication, which is received by the antenna in the tag. This paper, the microstrip patch antennas used both for transmitter antenna and receiver antenna likewise the reader antenna and tag antenna, simple patch antenna of this type radiates a linearly polarized wave. We investigated the transmission loss the RFID short range systems. Furthermore, we believed our studies can be designed the antennas for RFID systems. ©2009 IEEE.
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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.
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    Wireless ultra wideband transmission experiments
    (2011-12-01)
    Rankhamrat, Borromwut
    ;
    Promwong, Sathaporn
    The free space transmission estimation of ultra wideband impulse radio (UWB-IR) was developed by using the extension of Friis' transmission formula [1]. It considered the transmitted waveform and its distortion due to the channel and the transmitter (Tx) and receiver (Rx) antennas for the free space link budget evaluation of UWB-IR. This paper presents the two path evaluation formula of the ground reflection path loss for UWB-IR systems that based on the extension of Friss' transmission formula. Since the antennas are the pulse-shaping filters in UWB-IR systems, the biconical antennas are experimentally examined, especially focusing the effect of template waveforms. © 2011 IEEE.
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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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    Antenna transfer function evaluation scheme for ultra wideband medical applications
    (2011-12-01)
    Koonchiang, Krisada
    ;
    Manositthichai, Narongsak
    ;
    Fongsamut, Chalermpan
    ;
    Promwong, Sathaporn
    Antennas which are used to transmit and receive UWB signals must 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 for the performance evaluation. Conventionally, the authors measure the transfer function of the antenna by measuring the transmission coefficient between the transmit and the receive antenna, assuming that the transmit and receive antennas are identical. In this presentation, a more accurate three-antenna method is introduced so that the transfer function of each individual antenna can be measured. By using this method, biconical antennas are tested. The results show that these transfer functions are close to each other and that the antenna can be used for UWB meadical application (UWB-MA). Friis' transmission formula in complex form to treat the UWB signals to take into account the waveform distortion due to the frequency characteristics of the antennas [1], [7]. It is noted that Friis' transmission formula is applicable only in the far field region. In wireless meadical environments, however, the distance may not satisfy the far field condition. In this paper, we discusses the antenna evaluation of the transmission properties in Fresnel region. © 2011 IEEE.
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    Evaluation of the complex form in fresnel region for UWB free space transmission model
    (2009-12-01)
    Juengkittikul, Phattharamon
    ;
    Promwong, Sathaporn
    Friis' transmission formula in complex form to treat the UWB signals to take into account the waveform distortion due to the frequency characteristics of the antennas [1], [2]. It is noted that Friis' transmission formula is applicable only in the far field region. In personal area network (PAN) environments, however, the distance may not satisfy the far field condition. In this paper, we discusses the experimental evaluation of the transmission properties in Fresnel region. ©2009 IEEE.
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    Optimum template receiver of ultra wideband transmission network for short-range wireless communication systems
    (2009-12-01)
    Promwong, Sathaporn
    Ultra wideband impulse radio (UWB-IR) technology is an ideal candidate for wireless networks that can be utilized for short-range, high-speed, low power, and low cost indoor applications. The transmission link 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 network transmission performance, especially for the evaluation of waveform distortion effects.
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    Quantitative evaluation of wireless ultra wideband loss due to transmission gain and group delay
    (2011-12-01)
    Chantarawat, Chartchai
    ;
    Promwong, Sathaporn
    In this paper, we evaluated the effect of transmission gain and group delay in ultra wideband transmission by using the Friis' transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the evaluation formula in the term of transmission gain and group delay for the UWB-IR that takes into account the transmitted waveform, its distortion due to the antennas, the channel and the correlation receiver. Since the antennas are significant pulse-shaping filters in UWB impulse radio, the various kinds of the antennas are experimentally examined, especially focused on the effect of the received signal. © 2011 IEEE.
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    Ultra wireless transmission waveform measurement with IEEE802.15.3a
    (2013-12-31)
    Promwong, Sathaporn
    ;
    Rankhamrat, Borromwut
    ;
    Thavonsassanavong, Thanin
    ;
    Chaiyapong, Saksit
    Ultra wireless transmission waveform with IEEE802.15.3a or ultra wideband (UWB) band is expected to applied to wireless personal area networks (WPANs) such as the ranging in the home network and the office and broadband multimedia systems. Ultra wideband impulse radio (UWB-IR) transmission waveform is investigated by using extended Friis' transmission formula baseded on measurement data. This paper, we conderation the performance system design on ultra wireless system for WiMedia 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 spectrum 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 indoor environment by using a vector network analyzer (VNA). The UWB transmission gains of received signal and isotropic template receivers are shown and compared in results. © 2013 IEEE.
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    Indoor propagation channel measurement of ultra wideband antenna with robotic
    (2005-12-01)
    Boonvisat, Satean
    ;
    Promwong, Sathapom
    ;
    Supanakoon, Pichaya
    ;
    Kaewmechai, Sompoph
    ;
    Sitiyopasakul, Pisan
    In this paper, the characterization of ultra wideband (UWB) antenna with robotic is evaluated. The measurement system consists of transmitter (Tx) and receiver (Rx) biconical antennas measured by using a vector network analyzer (VNA). To obtaining the data, measurements were performed at 3 GHz to 11 GHz covered by a VNA, which provided information on the amplitude and phase of the transmission coefficient. Friis' transmission formula is not directly applicable and the waveform distortion may degrade the transmission performance as well. The matched filter is considered at the receiver side to maximize the SNR for evaluation. The power delay profile and the UWB transmission gain, based on the extension of Friis' transmission formula take into account the transmitted waveform and the matched filter into the system for the free space of UWB. The experimental examples using the biconical antenna as the receiver install with robotic are presented in this paper. © 2005 IEEE.