Compact groove‐loaded triband antenna for WLAN/WiMAX applications

Abstract

can be observed that the radiation patterns are not uniform totally in azimuth plane. This may be due to two factors. One is the current distribution is not totally uniform around the central axis, because the feeding point departs from the central point. The other is that the ground plane is a little smaller in this design. Figure 9 shows the simulated and measured elevation radiation pattern (x-z plane) at 2.11 and 2.29 GHz. As revealed in elevation pattern, approximations to a conical beam patterns are achieved and the peak gain occurs at elevations of about 40 . The value of the null at 270 shows a great level in comparison with the simulated result, which is mainly caused by the parasitic effect of SMA connector and transmission line loaded at the back of this antenna. From Figures 8 and 9, it is seen that the antenna has similar radiation pattern for the two status of the PIN diode. The measured gains of 4.2 and 3.5 dBi are achieved at 2.11 and 2.29 GHz, respectively. The gain at 2.29 GHz is a little smaller than that at 2.11 GHz due to the insertion loss of the PIN diode [9].ABSTRACT: In this article, a novel microstrip lowpass filter with complementary split-ring resonators (CSRRs) is presented. By properly controlling the width of the transmission line and rotating the angle of CSRRs, a wide stopband with sufficient rejection level can be achieved. The full-wave electromagnetic simulator IE3D is used; moreover, the prototypical microstrip lowpass filter is fabricated and measured. Simulated results and experimental responses are compared; moreover, the match between simulation and measurement validates the proposed structure.

A Compact Microstrip Slot Antenna With a Pair of Inverted L-Strips and Elliptical-Arc-Shaped Stub for Wlan/Wimax Applications

“…Compared to many antennas proposed in recent papers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], this antenna is designed based on a rather simple structure and suitable for all the WLAN/WiMAX frequency bands. By introducing a pair of symmetrical inverted L-strips and an elliptical-arc-shaped stub, the proposed antenna can generate two separate resonances at 3.5 and 5.5 GHz, while the trapezoid and ellipse slot on the ground plane is to excite the lowest resonant mode.…”

“…Owning to these merits, several promising types of dual-band and multiband antennas have been reported in the recent literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. For example, many printed monopole antennas with different shapes have been presented, including a printed symmetrical Gshaped antenna [1], a printed double-T-shaped antenna [2], an Lshaped and E-shaped antenna [3], and a planar antenna with a shorted parasitic inverted-L wire [4].…”

“…But the radiation performances of these antennas are not so good especially in the upper band because of the asymmetric structures. In [12][13][14][15], although the antennas have good radiation characteristics and reasonable compact size for both WLAN and WiMAX systems, they are somewhat complicated in structures.…”

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]. And, there is increasing demand for antennas having more compact size to be suitably embedded in the practical portable devices for multi-input/multi-output (MIMO) IEEE 802.16m WiMAX system.…”