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Rectangular slot antenna with Asymmetrical conductor strip for bandwidth enhancement coverage UWB standard
(2014-01-01)
Archevapanich, Tuanjai
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Rakluea, Paitoon
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Anantrasirichai, Noppin
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Purahong, Boonchana
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Chutchavong, Vanvisa
This paper presents the bandwidth enhancement of rectangular slot antenna fed by microstrip line on the flexible Mylar Polyester film substrate. Asymmetrical conductor strip is designed and inserted in the rectangular slot to extend the bandwidth from 3.06 GHz to 7.2 GHz frequency range. Besides, the rectangular conductor at the end of the feeding microstrip line is introduced for increasing the bandwidth at high frequency up to 12.32 GHz. This improved antenna to cover standard frequency range of UWB (3.1 GHz – 10.6 GHz). Finally, as to reject the frequency band of IEEE 802.11a (5.15 GHz – 5.35 GHz), the line strip at the side of tuning stub is added. In this case, the band-notched frequency from 5.15GHz to 5.38 GHz can be easily obtained.
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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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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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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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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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Magnetic field distributions of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot
(2008-12-01)
Wounchoum, Phairote
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Worasawate, Denchai
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Phongcharoenpanich, Chuwong
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Krairiksh, Monai
in this paper, the magnetic field distribution of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot is presented. The correlations between the field distributions of the antenna and the mode-based field distributions are presented. The radiation pattern, magnetic field distribution and magnitude of S11 are investigated in the terms of the length of the sectoral resonator. It shows that the TE112 mode has degenerated to the magnitude of S11 for the circumferential slot array antenna. The results provide useful information for the design of switched-beam array antenna on the concentric sectoral cylindrical resonators. ©2008 IEEE.
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Inversed e-shape slot antenna for WLAN applications
(2007-12-01)
Archevapanich, Tuanjai
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Anantrasirichai, Noppin
This paper present an inversed e-shape slot antenna for wireless LAN applications. The antenna is designed for dual frequency band 2.38 -2.5 GHz and 4.8-6.16 GHz of resonance frequency 2.44 GHz and 5.68 GHz, respectively, which can support WLAN applications coverage IEEE 802.11b/g (2.4 -2.4835 GHz), IEEE 802.11j (4.90-5.091 GHz), IEEE 802.11a (5.15-5.35 GHz), and Wimax of IEEE 802.16d (5.7-5.9 GHz). The bandwidth at low resonance frequency and high resonance frequency are 0.12 GHz and 1.36 GHz, respectively. The simulation results of inversed e-shape slot antenna are analyzed by using Method of Moment (MoM) from IE3D Software. © ICROS.
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Radiation characteristics of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot
(2007-12-01)
Wounchoum, Phairote
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Phongcharoenpanich, Chuwong
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Worasawate, Denchai
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Krairiksh, Monai
This paper presents the radiation characteristics of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot. The magnetic fields inside the sectoral cylindrical resonator for the first few modes are presented with sectoral angle of 60 degrees. It shows that the appropriate mode for a slot array antenna on a concentric sectoral cylindrical resonator is the TM<inf>110</inf> mode. The radiation patterns of two-slot array antenna on a concentric sectoral cylindrical resonator for single sector are illustrated. The location of the coupling slot is considered to find the appropriate radiation pattern. The results provide useful information for the design of switched-beam array antenna on the concentric sectoral cylindrical resonators.
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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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