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Study on CPW-antenna for wideband coverage mobile 4G/WLAN/WiMAX/UWB
(2015-01-01)
Sangaroon, O.
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Anantrasirichai, N.
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Rakluea, P.
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Rakluea, C.
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Poch, P.
A CPW antenna is designed at resonant frequency 2.3 GHz on low cost FR4 substrate by using simulation software. The simple rectangular slot loop antenna fed by coplanar waveguide is referred as a prototype antenna to show the designed technique for bandwidth enhancement. To enhance the first band, the rectangular slot is extended from the top of slot loop into the inner conductor, and to achieve more wideband by inserting triangular conductor at the bottom of rectangular slot. Finally, the technique to enhance wide bandwidth coverings mobile 4G, WLAN, WiMAX, and UWB is done by inserting U-shaped strip into inner rectangular slot. The simulated impedance bandwidth of our propose wideband antenna is 8.52 GHz from frequency range of 2.22 GHz-10.74 GHz which is the coverage of mobile 4G (2.3 GHz-2.5 GHz), WLAN standard of IEEE 802.11b/g/j/a/n (2.4 GHz-2.4835 GHz, 4.9 GHz-5.091 GHz, 5.15 GHz-5.35 GHz, and 5.725 GHz-5.825 GHz), WiMAX (2.5 GHz, 3.5 GHz, 5.8 GHz), and UWB (3.1 GHz-10.6 GHz). The measurements of this real antenna confirm that our proposed techniques can achieve wide frequency range of 2.26 GHz-11.14 GHz, which is suitable for the low-frequency of mobile 4G and also cover the high-frequency of UWB. That means, our antenna can supports all standard frequencies of applications in WLAN, WiMAX, and UWB. By this performance, the proposes antenna can be used in several wideband applications.
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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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Improvement microstrip patch antenna for ultra-wideband by C-shaped wide slot
(2010-12-01)
Satthamsakul, S.
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Puntheeranurak, S.
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Benjankaprasert, C.
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Anantrasirichai, N.
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Wakabayashi, T.
The simple rectangular patch antenna is designed at frequency 7 GHz and matched impedance with 50 ohms of transmission line. The technique to achieved widest bandwidth from 3 GHz to 12 GHz coverage standard of UWB applications is proposed by etches out slot on the ground plane with inset technique. The configuration and the size of slot on the ground plane are important to enhanced bandwidth, and inset feed is used for good impedance matching in wide frequency range. The radiation patterns of each frequency show the bi-directional with null at angle ±90°. ©ICROS.
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Design of right angle slot antenna for dual band and dual polarized with wireless network
(2010-12-01)
Pomsathit, A.
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Benjangkaprasert, C.
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Anantrasirichai, N.
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Rakluea, Paitoon
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Wakabayashi, T.
A novel compact and light weight antenna for dual band and dual polarized right angle slot antenna fed by micorstrip line use in wireless network technology is designed. The antenna composed of three right angle slot radiators on a same ground plane. Two right angle slots in the same size are arranged for circularly polarized at frequency 4.95 GHz and the other one is designed for linearly polarized at frequency 2.45 GHz. Therefore, in order to achieve dual band and dual polarized with good matching, the technique of arrangement is recommended. The simulation results of return loss, VSWR, gain, axial ratio, and radiation patterns are shown at resonant frequency 2.45 GHz and 4.95 GHz. ©ICROS.
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Compact ultra-wideband antenna with dual band-notch design using several parasitic elements
(2010-01-01)
Kueathaweekun, W.
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Benjangkaprasert, C.
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Anantrasirichai, N.
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Wakabayashi, T.
A compact ultra-wideband (UWB) antenna with band-notches designed using a technique that incorporates several parasitic elements is presented. The proposed antenna can be applied to UWB communication systems to avoid interference with other wireless communication systems. By using parasitic elements (C-shaped, inverse C-shaped, L-shaped, J-shaped, and line strip) inserted in the slot antenna, desired bands can be rejected, such as Wireless Local Area Networks (WLAN), (5-6 GHz) and Worldwide Interoperability for Microwave Access (WiMAX), (3.5 GHz). The characteristics of the antenna can be modified to tune the band-notch frequency and the bandwidth of the band-notch. Several parasitic elements can be used to create a dual band-notched design. A UWB slot antenna and four types of single band-notched design are also provided for reference. The paper also presents experimental results regarding the input performance, radiation patterns, and gain of the antenna at different operational frequencies.
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Compact slot antenna with rectangular-ring tuning stub for ultra-wideband application
(2009-01-01)
Kueathaweekun, W.
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Anantrasirichai, N.
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Benjangkaprasert, C.
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Wakabayashi, T.
A compact microstrip-fed slot antenna with rectangular-ring tuning stub for ultra-wideband application is presented. The characteristics of antenna are proposed and analyzed for instance return loss, bandwidth, and far field radiation patterns. The measurement results of the impedance matching for the proposed antenna show the impedance bandwidth of 120% of the center band (3.09-12.15GHz), determined by -10 dB return loss. The measured radiation patterns are bi-directional and average gain is 3.5 dBi.
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Study on microstrip line fed rectangular slot antenna for widen bandwidth
(2009-01-01)
Achevapanich, T.
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Arsusiri, N.
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Purahong, B.
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Sangaroon, O.
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Anantrasirichai, N.
The simple rectangular slot antenna fed by microstrip line is design and use as an original antenna for study on the various shapes of tuning stub for widen bandwidth. The tuning stub is design at the end of the microstsrip line on the other side of slot antenna. The shape and size of tuning stub will affect to the bandwidth, the adjustment parameters dimension of stub can achieve desirable bandwidth. The bandwidth of the original antenna without stub is 0.5 GHz from frequency range 2.24-2.74 GHz. In this paper, we proposed the four shapes of tuning stub for achieved either single widen bandwidth or dual widen bandwidth use in wireless communications. The bandwidth of slot antenna is expanded more than 1 GHz up to 7 GHz depend on the shape of tuning stub and its parameters. The simulated return loss and bandwidth can be obtained by using IE3D software.
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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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