Conference Paper

Fractal monopole antenna for WLAN USB dongle

DOI: 10.1109/LAPC.2009.5352377 Conference: Antennas and Propagation Conference

ABSTRACT This article presents the design and fabrication of a simple printed fractal monopole antenna for WLAN USB dongle applications. The proposed antenna uses the combination of meander line and fractal geometry, which is very simple and easy to fabricate, to achieve a multiband operation characteristic. The parameters of this antenna were optimized through numerical simulations in Ansoft HFSS, after which the antenna has been fabricated and characterized. The measurement results show that the proposed antenna has a -10 dB return loss bandwidth of 2.22 to 2.52 GHz and 5.03 to 5.84 GHz, which covers the entire required band for WLAN 802.11a/b/g standards. Moreover, from the simulation results, it is also observed that this proposed antenna exhibits constant gain of 1.8 dBi with 95% radiation efficiency in the lower band and 2.4 dBi with 94% radiation efficiency in the upper band, respectively.

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    ABSTRACT: This paper presents the design of a new dual-band internal printed monopole antenna structure as a candidate for WLAN (wireless local area network) USB (universal serial bus) dongle applications. The proposed antenna structure is based on the second iteration of Peano- type space-filling geometry. The antenna has been printed on a substrate with relative permittivity of 2.33 and thickness of 0.8 mm, and fed with 50 Ω microstrip line. The resulting antenna has been found to possess a compact size of 15 mm × 5.6 mm, which is suitable for this application. Furthermore, the proposed antenna offers a dual resonant behavior with frequency ratio of about 2.41; resulting in bandwidths, for return loss ≤ −10dB, covering the two WLAN band standards. A parametric study has been conducted to demonstrate the effects of different antenna parameters, such as the printed antenna trace width and the length of the tuning stub, on the resulting antenna performance. Modeling and performance evaluation of the proposed antenna have been carried out using the CST Microwave Studio. Simulation results of return loss, radiation patterns, and gain verify that the presented antenna represents a good solution for dual-band WLAN USB dongle applications. An important feature the antenna offers is that, the lower WLAN bandwidth is approximately the double of the upper one. This bandwidth extends from 1.93 GHz to 2.68 GHz which implies that the proposed antenna supports the operation of many wireless services that include UTMS (1.93-2.17 GHz), WiBro (2.3-2.4 GHz), Bluetooth (2.4-2.484 GHz), and S-DMB (2.605-2.655 GHz), in addition to the 802.11/b WLAN (2.4-2.485 GHz) bands. The upper WLAN bandwidth extends from 5.59 Hz to 6.05 GHz, which covers the 802.11/a WLAN (5.725-5.825 GHz) band. Another important feature is that the resulting antenna gain, for both WLAN applications, is significantly larger than what is reported in the literature. It is hopeful that this antenna finds its place for use in portable dual-band MIMO applications.
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