A Wideband Open-slot Antenna for Phased Array Application

An open-slot antenna with wideband characteristics for the phased array is proposed. The antenna consists of a stripline-slotline transition and L-shaped metal arms connected with the slotline. Due to the loading of the metal ground and the passive director element, the antenna can realize unidirectional radiation. The transition from stripline to slotline is realized by using a cross-coupling structure, which is conducive to realizing impedance matching. Furthermore, due to a fan-shaped branch at the end of the transition structure, the antenna can realize good impedance matching in a wide band. The antenna is fabricated and its performance is measured; measured results show that the antenna achieves a -10 dB impedance bandwidth from 30 to 37 GHz. The antenna can be well applied to a phased array system.