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Author: search.filters.author.Deepunya, ChairakSubject: search.filters.subject.UWB

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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).