An Element-Staggered, Wide-Angle Beam Scanning Transmitarray Antenna with Four Focuses Design

A wide-angle beam-scanning low side lobe level transmitarray antenna which is working in Ka-band is put forward in this paper. The proposed transmitarray is consist of a transmitting surface with four-layer subwavelength circular patch elements which are in staggered arrangement and a movable feed. Four focuses design is used for reducing the phase error and the loss of gain caused by rotating the feed. The simulation results demonstrate that the loss of gain is less than 1.2 dB, the side lobe level is lower than -17.8 dB during the scanning range of ±30 degrees at typical frequency of 35 GHz. The excellent performance shows that it can be used for millimeter wave imaging system.