A coupling‐fed multiband antenna for WLAN/WiMAX applications

Abstract

A coupling-fed printed monopole antenna applied to wireless local area network/worldwide interoperability for microwave access (WLAN/WiMAX) applications is proposed. By using a pair of branch-shaped strips, which are symmetrical with a gradual changing strip, the proposed antenna exhibits multiband performance to meet the requirements of WLAN in the 2.4/5.2/5.8 GHz bands and WiMAX in the 2.5/3.5/5.5 GHz bands. The proposed antenna has good omnidirectional radiation characteristic owing to its symmetric structure and achieves gains to be 2.44, 3.74, 3.3, and 2.02 dBi at 2.4, 3.5, 5.2, and 5.8 GHz, respectively.

Fundamental characteristics of L-shaped and U-shaped folded monopole antennas with parasitic elements for WiMAX/MIMO antenna

“…2.5/3.5/5.5 GHz bands (2.3 ~ 2.7 GHz, 3.4 ~ 3.8 GHz, 5.25 ~ 5.85 GHz) are the operational frequencies of WiMAX [1]. Moreover, WiMAX employs multi-input multi-output (MIMO) applications, which is highly investigated in order to increase transmission rates and allow for a better reach without the need of more spectrum.…”

Planar multi-band monopole antenna for WLAN/WiMAX applications

“…The proposed planar monopole antenna also provides the nearly omni-directional radiation patterns with maximum measured peak antenna gains and radiation efficiencies of 3.2 / 3.5 / 5.4 dBi and 72 / 98 / 96 % across the operating bands, respectively. Also, compared with the presented antenna designs in the literature [1][2][3][4][5][6][7], this proposed monopole antenna has more than 20% antenna size reduction to achieve compact operation. Details of the proposed monopole antenna design are described, and experimental results for the obtained performance operated across the 2.45 / 3.5 / 5.5 GHz bands are presented and discussed.…”

“…The currently presented antenna designs suitable for multi-band operations in the 2.45 GHz (2.4 -2.484 GHz), 3.5 GHz (3.4 -3.69 GHz) and 5.5 GHz (5.15 -5.95 GHz) bands for WLAN/WiMAX applications have been reported in [1][2][3][4][5][6][7][8][9]. However, there is the disadvantage of being larger antenna size for these above MAs [1][2][3][4][5][6][7] and increasing demand for antennas having more compact size to be suitably embedded in the practical portable devices for WLAN/WiMAX application. Therefore, in this article, we propose a novel planar T-shaped monopole antenna with a pair of mirrored L-shaped strips for multiband WLAN/WiMAX communication.…”

A Novel Tri-Band Printed Monopole Antenna With an Etched ∩-Shaped Slot and a Parasitic Ring Resonator for Wlan and Wimax Applications

“…To satisfy the IEEE 802.11 WLAN standards in the 2.4/5.2/5.8 GHz operating bands and the WiMAX standards in the 2.5/3.5/5.5 GHz bands, multiband antennas with simple structure and superior radiation performance are required. In recent years, many dual wideband and tri-band printed monopole antennas for WLAN/WiMAX applications have been studied and proposed in [1][2][3][4][5][6][7][8][9][10][11]. However, additional band pass filters are required to be added into the system to avoid frequency collision and minimize interference when these antennas in [1][2][3][4][5][6][7][8][9][10] are used, because they have very wide frequency coverage, covering many existing narrowband services such as 3G mobile communications and S/C-band satellite communications.…”

“…In recent years, many dual wideband and tri-band printed monopole antennas for WLAN/WiMAX applications have been studied and proposed in [1][2][3][4][5][6][7][8][9][10][11]. However, additional band pass filters are required to be added into the system to avoid frequency collision and minimize interference when these antennas in [1][2][3][4][5][6][7][8][9][10] are used, because they have very wide frequency coverage, covering many existing narrowband services such as 3G mobile communications and S/C-band satellite communications. Though the antenna proposed in [11] has three distinct operating bands for WLAN and WiMAX, it's very large in size the same as the antennas in [2,10], and much complex in structure as well as the antennas in [4,5] and [8][9][10].…”