Small monopole antenna with two curved strips for wireless USB applications

In this paper, a monopole antenna with two curved stripes connected to feed point is proposed for WLAN USB dongle application. The meandered monopole excites a resonant mode at 2.4 GHz while the shorter curved strip operates two higher modes for 5.2 and 5.8 GHz bands. By the way, the part of two higher modes (5.2 and 5.8 GHz) is just used one band to cover the bands at 5GHz. The longer curved strip is used to extend the monopole´s current path for 2.4 GHz band. From the simulated and measured S11, the -10 dB operating bands cover the bands of IEEE802.11 a/b/g WLAN applications. To the antenna dimensions, the proposed antenna occupies a very small area of 40 mm × 10 mm that can be easily to be applied in portable wireless devices. In addition, the antenna portion having only 10 mm × 10 mm is relatively small for applications.