Based on the high directivity of Yagi antenna, a planar Yagi printed antenna with six adjustable beams is designed. In order to increase the bandwidth, a tie type structure is used as the driven dipole, of which the two arms are located on the opposite side of the substrate. Only one PIN (positive-intrinsic-negative) diode switch is loaded between the ground and the driven dipole arm on the ground to control the antenna element with its radiation direction having no extra bias circuits required. The measured results well match the simulation, and show that the bandwidth of the return coefficient below −10 dB is 400 MHz, gain of the reconfigurable antenna is 7.5 dB on the main radiation directions of 30°, 90°, 150°, 210°, 270° and 330°, and the half power beam width of each direction is below 60°. This reconfigurable antenna with the scanning function of six directions and good directivity can be applied to small base stations or other wireless communication systems.
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