A Rhombic Patch Monopole Antenna With Modified Minkowski Fractal Geometry for Umts, Wlan, and Mobile Wimax Application

Abstract

Abstract-This paper presents a rhombic patch monopole antenna applied with a technique of fractal geometry. The antenna has multiband operation in which the generator model, which is an initial model to create a fractal rhombic patch monopole, is inserted at each center side of a rhombic patch monopole antenna. Especially, a modified ground plane has been employed to improve input impedance bandwidth and high frequency radiation performance. The proposed antenna is designed and implemented to effectively support personal communication system (PCS 1.85-1.99 GHz), universal mobile telecommunication system (UMTS 1.92-2.17 GHz), wireless local area network (WLAN), which usually operate in the 2.4 GHz (2.4-2.484 GHz) and 5.2/5.8 GHz (5.15-5.35 GHz/5.725-5.825 GHz) bands, mobile worldwide interoperability for microwave access (Mobile WiMAX), and WiMAX, which operate in the 2.3/2.5 GHz (2.305-2.360 GHz/2.5-2.69 GHz) and 5.5 GHz (5.25-5.85 GHz) bands. The radiation patterns of the proposed antennas are similar to an omnidirectional radiation pattern. The properties of the antenna such as return losses, radiation patterns and gain are determined via numerical simulation and measurement.Corresponding author: C. Mahatthanajatuphat (cmp@kmutnb.ac.th). 58Mahatthanajatuphat et al.

Planar Compact Multi-Band C-Shape Monopole Antenna With Inverted L-Shape Parasitic Strip for Wimax Applications

“…To study the antenna size reduction for the proposed C-shape monopole antenna, the comparisons of the overall antenna volumn including the ground plane for this proposed and other presented antenna designs in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] are listed in Table 4. It is seen that this proposed monopole antenna has more than 25% antenna size reduction to obtain compact operation, which is more suitable for embedding into the USB dongle.…”

“…The related monopole antenna (MA) designs for WiMAX applications have been presented by using dual U-shaped MA [1], inverted L-shaped MA [2], rhomb shaped MA with slits [3] or modified Minkowski fractal geometry [4], inverted-F antenna [5], MA with branch slits [6], MA with rectangular horizontal strips and trapezoidal ground plane [7], mirrored-L MA [8], asymmetric rectangular MA with additional strips [9], rectangular MA with a circular disc [10], MA loaded with four different grooves [11], MA using branch strips [12], pentagonal MA with two thin bent slots [13], MA with an etched ∩-shaped slot and a parasitic ring resonator [14], MA with two semi-circle strips [15], T-shaped MA with a trapezoidal ground plane [16], MA with C-shaped and Sshaped meander strips [17] or with C-shaped and L-shaped monopole strips [18] and rectangular MA with parasitic outside ring [19]. However, there is the disadvantage of being larger antenna size for these above MAs [1-7, 9, 10, 14-17, 19] or complex antenna structure [8,[11][12][13]18].…”

A Cylindrical Wideband Conformal Fractal Antenna for GPS Application

“…Karmakar et al proposed a complementary stacked patch antenna with fractal shape defect for wideband characteristics for 1.8 to 6.4 GHz with fractional bandwidth of 89.1% on flat surface [10]. In published literature [11][12][13] the bandwidth informations are not available. The antennas are designed on the FR4 substrate in [9][10][11][12].…”

“…Some antennas are designed using fractal concept on flat surface at higher frequency compared with GPS frequency [9][10][11][12][13]. Dholakiya et al proposed a microstrip antenna with a circular shaped fractal slot to improve the bandwidth for 2 to 6 GHz having working bandwidth of 52% [9].…”

Design of Tri-Band Printed Monopole Antenna for Wlan and Wimax Applications

“…Furthermore, they also have the advantages of low profile, simple structure, easy fabrication, and good monopolelike radiation pattern. Many dual-wideband and wideband printed monopole antennas have been proposed in [1][2][3][4][5][6][7] for WLAN and WiMAX applications. However, when these antennas are used in WLAN and WiMAX systems, additional band pass filters are required to avoid collision and minimize frequency interference because their wide operating bands cover many existing narrowband services.…”