Miniaturized broadband Quasi-Yagi antenna for wireless communication and recognition

This paper presents a miniaturized broadband Quasi-Yagi antenna which adopt new compact layout and modified bowtie driven dipole. In the proposed antenna, the micro strip feed and λ/4 impedance transformer are placed horizontally to reduce the vertical size. Meanwhile, in order to reduce the horizontal size, the vertical metallic strips are loaded to the end of bowtie driven dipole and ground patch. Compared to the conventional Quasi-Yagi antenna, the overall size of the proposed antennas are reduced about approximately 50%. The measured results show that the impedance bandwidth (reflection coefficient<; -10dB) of proposed antenna is 1.16GHz (42.6%) for 2.14-3.3GHz and it has a wide bandwidth about 2.23-3.25GHz with reflection coefficient<;-15dB. Moreover, the realized gain is around 4dBi in the operating bandwidth. This antenna can be used for wireless communications and recognitions like WLAN, RFID, WiMAX and LTE.