Abstract: A dielectric-supported switched parasitic Yagi monopole antenna array for mobile wireless communications is developed.Based on the Yagi antenna principle,the proposed antenna realizes frequency and pattern reconfiguration,simultaneously.Switches are used to change operating frequency and radiation pattern between different working states.Moreover,a ground branch has been introduced to improve impedance matching and broaden operation bandwidth.The antenna can cover the bands of 1710~1880 MHz,1850~1990 MHz and 2400~2484 MHz with S11<-10 dB. Measurements including return loss,radiation patterns are presented to verify the proposed design of antenna.Frequency changing and beam scanning can be realized easily.