Triple‐band cavity‐backed Z‐like slot antenna for WLAN applications

Abstract

In this letter, a triple‐band Z‐like cavity‐backed slot antenna was designed, fabricated, and measured. A Z‐like slot is employed here to attain the triple‐band operation, whereas a metallic superstrate is placed above the Z‐like slot to achieve the high‐gain enhancement within the lower bandwidth at 2.45 GHz. The parametric studies of the proposed‐antenna are provided and mechanisms of triple‐band operation and gain enhancement within the lower bandwidth are also discussed. The measured‐results are in good agreements with simulated ones, which reach the bandwidth from 2.26 to 2.58 GHz, 5.15 to 5.28 GHz, and 5.68 to 5.88 GHz, respectively. Simulated‐ and measured‐gain results show that the proposed‐antenna reaches 11.59 dBi at 2.45 GHz, higher than 7 dBi at band of 5.25 GHz and 6.0 dBi at band of 5.85 GHz, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2296–2301, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24616

High-Gain Slot Antenna With Parasitic Patch and Windowed Metallic Superstrate

“…Based on our previous work [19,20], the windowed area can be taken as an antenna aperture, where the tangential electric fields are uniform and larger than the normal ones. Moreover, the electric fields at the window fringe and the margin of the superstrate are in-phase if the size is properly selected and both sides of the superstrate can be viewed as two air-filled microstrip patch antennas.…”

“…However, the gains of the antennas [8][9][10][11][12][13][14][15][16][17][18] mentioned above may still not be large enough for the p2p application. In our previous works [19,20], a windowed metallic superstrate was placed above the CBS, and by properly adjusting the height of the superstrate and size of the window, gains larger than 11.5 dBi were attained across the impedance bands of 2.35-2.55 GHz. Notwithstanding, the profiles of these two antennas are still too large, and the fabrication and installation of the cavity are not convenient.…”

A Printed Monopole Antenna for Triple-Band WLAN/WiMAX Applications

“…Compared with the broadband antenna, the multiband antenna can effectively filtrate the unnecessary bands [1,2], which will reduce the system interference and complex for multimode operations. As a result, various kinds of multiband antennas including dual-band and triple-band antennas with different structures, such as those in [3][4][5][6][7][8][9][10][11], have been proposed to meet the applications for both multiband wireless communication systems. Firstly, two bands were involved in [3] by using a pair of multibranch strips in the radiator; a coplanar waveguide-(CPW-) fed printed monopole antenna with an n-shaped slot for dual-band operation was proposed in [4] and a complementary electric field coupled (CELC) resonator was loaded in the ground plane of a conventional patch antenna to achieve dualband operation in [5].…”

“…Firstly, two bands were involved in [3] by using a pair of multibranch strips in the radiator; a coplanar waveguide-(CPW-) fed printed monopole antenna with an n-shaped slot for dual-band operation was proposed in [4] and a complementary electric field coupled (CELC) resonator was loaded in the ground plane of a conventional patch antenna to achieve dualband operation in [5]. Furthermore, in [6][7][8][9][10][11], some triband antennas have been presented. A single-cell metamaterial loading was introduced to design triple-band monopole antenna in [6].…”

“…A single-cell metamaterial loading was introduced to design triple-band monopole antenna in [6]. A cavity-backed slot antenna was presented for triple-band wireless communication in [7] by a wide Zlike slot replacing the traditional rectangular slot. A coplanar waveguide-(CPW-) fed planar monopole antenna with two bent slots for WiMAX and WLAN applications was also proposed in [8].…”