Abstract:According to the development of handheld wireless devices，a multi-band antenna is designed. It can be applied to the Beidou satellite navigation system, Global Positioning System(GPS)，and Wireless Local Area Networks(WLAN). The structure is based on Planar Inverted F-shaped Antenna(PIFA). Two L-shaped slots are grooved around the edge of the radiation patch. The antenna can work at 1.575 GHz,2.445 GHz and 5.32 GHz with wide enough bandwidth，and meet the frequency requirements of above mentioned wireless systems. The distribution of the current on the patch surface is analyzed，and performance of antenna influenced by the location，shape and size of slots is investigated by using electromagnetic simulation software. Experimental results verify the properties of this design.