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 x 10 mm that can be easily applied in portable wireless devices. In addition, the antenna portion having only 10 mm x 10 mm is relatively small comparing with the published printed antenna.