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Author: search.filters.author.Phongcharoenpanich, ChuwongSubject: search.filters.subject.WLAN

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    Investigation of received signal strength of IEEE 802.11n WLAN in coverage of nakhon Ratchasima Rajabhat University
    (2018-07-02)
    Nakprasit, Krittaya
    ;
    Phongcharoenpanich, Chuwong
    Wireless networks (WLAN) of IEEE 802.11n standards are being deployed in increasing numbers. The applications require high bandwidth so WLAN will be provided the high data rate over coverage area. The enhancements of WLAN bring to network engineers having significant problems of installing the access point. Prior to the installation of access points, it is difficult to predict access can be guaranteed at specific locations or not. To guarantee high data rate and quality of service, site survey of WLAN in Nakhon Ratchasima Rajabhat University (NRRU) is required. The importance parameter related to data rate and quality of service is Received Signal Strength Indicator (RSSI). WLAN investigation of received signal strength was measured inside indoor environment by using 3 programs: InSSIDer, Xirrus Wi-Fi Inspector and WirelessMon Professional. In this paper, free space loss equation with and without antenna gain can be simply applied to predict RSSI. This work is useful for WLAN planning of future NRRU.
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    Performance of textile antenna using two layers of strip line and round-off circular patch
    (2016-03-07)
    Chaihongsa, Warangkana
    ;
    Phongcharoenpanich, Chuwong
    In this paper, a dual band textile antenna operable at 2.4/5.2 GHz for WLAN application has been presented. The wearable 1 mm thick felt fabric having relative permittivity of 1.90 and loss tangent of 0.016 has been used as substrate material. The return loss, radiation pattern and realized gain measurements are used to characterize a prototype using vector network analyzer and anechoic chamber. The |S11| is lower than-10 dB covered the frequency band from 2.16 GHz to 2.63 GHz and from 4.45 GHz to 5.90 GHz. The gains at two bands are 1.8 dBi and 3.2 dBi, respectively. This antenna yields omnidirectional pattern. The simulation and measurement results are in good agreement. Additional, the effects on the return loss for the antenna under the bent conditions are further discussed.
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    Design of triple-band antenna using S-shaped patch fed by cross strip line for WLAN and WiMAX applications
    (2015-09-01)
    Chawanonphithak, Yuktitath
    ;
    Phongcharoenpanich, Chuwong
    This paper presents a simple triple-band S-shaped patch antenna fed by a cross strip line for both WLAN and WiMAX applications. It is operated at the triple bands of 2.4 and 5.2 GHz for WLAN and 3.5 GHz for WiMAX. The antenna, designed on an FR4 substrate with a thickness of 1.6 mm and relative permittivity of 4.4, is fed by a 50-Ω microstrip line, and is of size 25 × 35 mm. The simulated and measured results of |S<inf>11</inf>|, gains, and radiation patterns are presented. The measured results show that the triple-band antenna achieves a broad operating bandwidth of 2.36-2.54, 3.27-3.69, and 5.16-5.48 GHz for a 10-dB return loss (i.e. |S<inf>11</inf>|<-10 dB). The gains of the antenna measured at 2.4, 3.5, and 5.2 GHz frequencies are 1.87, 1.95, and 3.82, respectively. The radiation pattern of the antenna is omnidirectional.