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Author: search.filters.author.Deepunya, Chairak

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    Evaluation of Noise Margin in DVB-T2 System
    (2018-07-02)
    Deepunya, Chairak
    ;
    Suwansukho, Nattapan
    ;
    Promwong, Sathaporn
    This paper describes the Noise Margin of Digital Terrestrial Television network in Thailand. The result of analysis has delivered from 22 measured location, located in 22 district in Bangkok, Thailand.
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    Delay characteristics of UWB transmission waveform with human body for WBAN system
    (2018-06-08)
    Tiengthong, Thanadol
    ;
    Promwong, Sathaporn
    ;
    Deepunya, Chairak
    As one of the most interested short range wireless communication technology, Wireless Body Area Network (WBAN) had been widely development. IEEE 802.15.6 is defining the requirement for wireless body area network such as coexist with other wireless technology and low power spectrum. Ultra wideband (UWB) is the promising technology for wireless body area network. It has wide operated frequency bandwidth from 3 GHz to 10.6 GHz and low power radiation below-41.3 dBm/MHz. The application for WBAN can be mainly divided into medical and non-medical. It can use in-body, on-body and off-body. The effect of human body is investigating in this paper. The experimental model will consider about position and distant between receiver antenna and human body. Vector network analyzer is used to measure transfer function and biconical antennas are used as the transmitter antenna and receiver antenna. The results are describing in power delay profile, which present the effect of human body in transmission for WBAN application.
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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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    Experimental evaluation of WBAN antenna performance for FCC common frequency band with human body
    (2013-08-01)
    Noitubtim, Musleemin
    ;
    Deepunya, Chairak
    ;
    Promwong, Sathaporn
    Wireless communication systems have become important in daily life such as wireless body area network (WBAN). An ultra-wideband (UWB) technology is chosen to be used for short-range communication scenarios, low-power and high data rate technology which accommodates appropriate technology in WBAN. In this paper, we design a printed circular monopole with coplanar waveguide (CPW) fed for WBAN with common frequency band following FCC common band (7.25-8.5 GHz). The antenna structure is simple, using FR4 circuit board (PCB) with overall size of 18 × 20 × 1.6 mm<sup>3</sup>. The simulation and experiment results show that the proposed antenna achieves good impedance matching and stable radiation patterns over operating bandwidth of 6.8-12.34 GHz. Moreover, the authors evaluate UWB antenna in two scenarios are free-space and with human-body to consider the antenna performance in time domain. © 2013 Springer Science+Business Media Dordrecht(Outside the USA).