A PIFA type USB Dongle antenna for WLAN applications

In this paper, a meandered PIFA antenna with two curved strips extended from ground plane is proposed for WLAN USB dongle application. The meandered PIFA excites a resonant mode at 2.4 GHz while the lower curved strip (strip B) operates two higher modes for 5.2 and 5.8 GHz bands. The upper curved strip (strip A) with a rectangle stub on top of it is used to extend the PIFA´s current path and shift the 2.4 GHz band. The upper strip also increases the impedance bandwidth of the higher band. From the simulated and measured S11, the -10 dB operating bands cover the IEEE802.11 a/b/g WLAN applications. To the antenna dimensions, the proposed antenna occupies a very small area of 36.5 mm × 10 mm that can be easily applied in portable wireless devices. In addition, the antenna portion having only 10 mm × 10 mm is relatively small comparing with the published printed antenna.