Compact Wide-Slot Tri-Band Antenna for Wlan/Wimax Applications

Abstract

Abstract-In this paper, a wide-slot triple band antenna fed by a coplanar waveguide (CPW) for WLAN/WiMAX applications is proposed. The antenna mainly comprises a ground with a wide square slot in the center, a rectangular feeding strip and two pairs of planar inverted L strips (PIL) connecting with the slotted ground. By introducing the two pairs of PIL's, three resonant frequencies, 2.4/5.5 GHz for WLAN, and 3.5 GHz for WiMAX, are excited. Prototypes of the antenna are fabricated and tested. The simulated and measured results show that the proposed antenna has three good impedance bandwidths (S 11 better than −10 dB) of 300 MHz (about 12.6% centered at 2.39 GHz), 280 MHz (about 8% centered at 3.49 GHz) and 790 MHz (about 14.5% centered at 5.43 GHz), which make it easily cover the required bandwidths for WLAN band (2.4-2.48 GHz, GHz) applications. Moreover, the obtained radiation patterns demonstrate that the proposed antenna has figure-eight patterns in E-plane, and is omni-directional in H-plane. The gains of the antenna at operation bands are stable.

A Novel Compact Planar Triple-Band Monopole Antenna for Wlan/Wimax Applications

“…Three bands covering 2.3-2.75, 3.38-3.7, and 4.91-6.28 GHz are obtained, which cover the 2.5/3.5/5.5 GHz WiMAX and 2.4/5.2/5.8 GHz WLAN bands. The structure of the proposed antenna is much simpler than those presented in [1][2][3][4][5][6][7][8][9][10][11][12]. Also, this antenna exhibits higher gain than the one proposed in [3].…”

“…Triple-band CPW-fed antennas with three pairs of inverted-L strips and asymmetric ring are presented in [6,7], respectively. Dual-and triple-band slot antennas are proposed in [8,9], and literature [10] reports a modified swastika shape patch antenna. Multi-band monopole antennas have been widely investigated in [11][12][13][14][15][16].…”

“…So, a triple-band antenna is required. Many multi-band antennas [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and ultra-wideband (UWB) antennas [16] have been proposed. In [1], the antenna consists of three "ears" type strips, and three bands can be created by the three "ears".…”

Design of Tri-Band Printed Monopole Antenna 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. Many tri-band antennas have been proposed for WLAN and WiMAX applications in literatures [8][9][10][11][12][13][14][15], which have the better rejections in the undesired bands in comparison with wideband antennas. A paw-shaped antenna in [8], a wide-slot antenna with two pairs of inverted L-strips in [9] and a T-shaped antenna with two parasitic elements in [10], they create three operating bands by applying three different resonant lengths.…”

“…Many tri-band antennas have been proposed for WLAN and WiMAX applications in literatures [8][9][10][11][12][13][14][15], which have the better rejections in the undesired bands in comparison with wideband antennas. A paw-shaped antenna in [8], a wide-slot antenna with two pairs of inverted L-strips in [9] and a T-shaped antenna with two parasitic elements in [10], they create three operating bands by applying three different resonant lengths. In addition, another method to create three operating bands by introducing two notched bands in a wideband antenna is applied in [11][12][13][14][15].…”