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Trapezoid-stub fed rectangular slot antenna for WLAN and WiMAX applications
(2010-12-01)
Arsusiri, N.
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Sangaroon, O.
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Puntheeranurak, S.
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Anantrasirichai, N.
This paper proposes the design of slot antenna for wideband use in wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The antenna structure is comprised of a rectangular slot antenna and excited microstrip transmission line. The antenna is designed on low cost FR4 substrate and the simulation results are analyzed by IE3D Zeland software [1]. The trapezoid tuning stub at the end of the microstrip line is proposed for decreasing return loss between frequency range 2.27 GHz to 6.21 GHz. The simulation result of return loss of the proposed antenna is shown that the operating bandwidth at frequency range of 2.27-6.21 GHz coverage standard of IEEE 802.11 b/g/j/a/h in WLAN (2.4-2.4835 GHz, 4.9-5.1 GHz, 5.15-5.35 GHz, 5.7-5.9 GHz) and WiMAX (2.5-2.7 GHz, 3.4-3.6. 5.7-5.9 GHz). The characteristics of antenna are proposed and analyzed for return loss, input impedance, bandwidth, VSWR, gain, and radiation pattern. ©ICROS.
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A study on tuning-stub of slot antenna for ultra-wideband applications
(2010-12-01)
Arsusiri, N.
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Sangaroon, O.
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Puntheeranurak, S.
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Anantrasirichai, N.
This paper describes the increasing bandwidth of slot antennas with simply microstrip feed line design. The lower edge frequency of the first band depends on antenna size and the bandwidth becomes widen due to tuning stub. The effect of tuning stub can expand upper frequency of bandwidth to higher frequency. The higher frequency is defined by the stub shape, and its parameters are adjusted to match impedance of transmission line with 50 ohms. By properly setting stub size, a wide impedance bandwidth of the proposed antenna can be achieved for ultra-wideband applications. We propose the tuning stub at the end of the microstrip line for extending bandwidth over 8.0 GHz. In this case, an impedance bandwidth of the slot antenna with tuning stub is 8.05 GHz from frequency range 2.73 GHz to 10.78 GHz. This bandwidth coverage the requirement standard of IEEE 802.15a of frequency range from 3.1 GHz to 10.6 GHz of bandwidth 7.5 GHz by The Federal Communications Commission (FCC)[1]. ©ICROS.
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Wide-band slot antenna fed by coplanar waveguide for WLAN applications
(2009-01-01)
Kueathaweekun, W.
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Puntheeranurak, S.
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Benjangkaprasert, C.
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Anantrasirichai, N.
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Wakabayashi, T.
This paper presents the slot antenna fed by coplanar waveguide (CPW) for WLAN applications. The characteristics of an antenna are proposed and analyzed for instance return loss, bandwidth and far field radiation patterns. Simulation results of the proposed antenna show the impedance bandwidth, determined by-10 dB return loss, approximate 140 % (1.66-9.44GHz) of the center band. The radiation patterns are bi-directional, and maximum gain is 5.7 dBi at 5.0 GHz. The simulation results of the slot antenna are analyzed by using IE3D Software.
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Compact CPW-Fed wide slot antenna for ultra-wideband applications
(2009-01-01)
Kueathaweekun, W.
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Purahong, B.
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Benjangkaprasert, C.
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Anantrasirichai, N.
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Wakabayashi, T.
A compact ultra-wideband (UWB) CPW-fed slot antenna design is presented. The antenna consists of a wide rectangular slot on the ground plane with rectangular-ring shaped tuning stub. The simulation result of the impedance matching for the proposed antenna show the impedance bandwidth, determined by-10 dB return loss of 116 %, coverage 2.94 GHz to 11.06 GHz for UWB applications. The simulation radiation patterns and gain of the antenna at different operational frequencies are presented and discussed.
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Inset dual U-strip slot antenna fed by microstrip line for WLAN applications
(2008-12-01)
Archevapanich, T.
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Nakasuwan, J.
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Purahong, B.
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Anantrasirichai, N.
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Sangaroon, O.
This paper presents the slot antenna fed by microstrip line with inset U-strip for dual frequency operates in WLAN applications. The rectangular slot antenna is proposed for comparison between with and without U-strip in slot antenna by using three configurations of slot antenna. This antenna is designed for dual frequency used in WLAN system coverage IEEE 802.11b/g (2.4-2.4835 GHz), IEEE 802.11J (4.90-5.091), IEEE 802.11a (5.15-5.35 GHz) and WiMAX of IEEE802.16d (5.7-5.9 GHz). The PCB-FR4 substrate with dielectric constant (ε<inf>r</inf>) 4.5 of thickness 1.6 mm is chose for low cost. The simulation results of these slot antennas are analyzed by using Method of Moment (MoM) from IE3D Software. Finally, the result of bandwidth at low frequency and high frequency of the desirable antenna are 9.76% and 31.6% at frequency range 2.3-2.58 GHz and 4.76-6.34 GHz, respectively.
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Wide-band slot antenna for IEEE 802.11b/g
(2006-12-01)
Kueathawikun, W.
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Thumwarin, P.
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Anantrasirichai, N.
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Wakabayashi, T.
This paper presents coplanar waveguide (CPW) fed step slot antenna. It achieves wide band from 2.0 GHz to 4.2 GHz which is the frequency band covered the standard IEEE 802.11b/g (2.4 - 2.485 GHz) for use in WLAN (Wireless Local Area Network) and covered two frequencies of WiMAX (Worldwide Interoperability for Microwave Access) 2.5 GHz and 3.5 GHz. The characteristics of antenna are proposed and analyzed for instance input impedance, return loss and far field radiation patterns. © 2006 ICASE.
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The effect of varying dimension of slot loop antenna
(2005-12-01)
Chanoodhorm, S.
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Anantrasirichai, N.
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Wakabayashi, T.
The purpose of this paper is to study the effect of varying dimension of slot loop antenna by fix perimeter. The concept of designing is most simply introduced by considering a width of slot antenna for match impedance 50 ohms. This research is concerned in proportional of length and width of loop shape, such as : square loop shape 1:1, rectangular loop shape 5:4, 10:7, 3:2 and 2:1, respectively. The perimeter of loop shape is designed at frequency 2.4 GHz, this perimeter is fixed for other loop shape for considered the effect of varying dimension. © 2005 IEEE.

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