A novel miniaturization Quasi Yagi-Uda antenna

This paper presents a novel miniaturezation Quasi Yagi-Uda antenna based capacitive loading technique and new layout. In the proposed antenna, the horizontal size of the proposed antenna is reduced by adding vertical metallic strips at the end of the driver and reflector. Meanwhile, the 1/4 wavelength transformer and balun are placed horizontally to reduce the vertical size. In this way, the overall dimensions of the proposed antenna could be decrease without much loss in other performance indicators. Then the parameters of the antenna is optimized by the software HFSS. The measurement results exhibit that the proposed antenna has a good VSWR from 902MHz to 928MHz and its gain is about 5.8dBi at 915MHz. And the overall size of proposed antenna is 110mm*105mm that is around λ/3 × λ/3 where λ is the wavelength of the centre frequency.