Design of A Ku-Band 1-Bit Broadband and Low-Loss Reconfigurable Transmitarray Element

The design of a Ku-band 1-bit reconfigurable transmitarray element with good performance is presented in this paper. The element is designed based on the Rx-Tx approach. The U-shaped slot patch is the receiving (Rx) structures and the C-shaped probe-fed patch is the transmitting (Tx) structure. By adopting this design, the element results in simple procedure. Two PIN diodes are integrated symmetrically on the C-shaped microstrip line. By turning them ON or OFF simultaneously, the induced current directions are reversed, thus achieving two phase states with 180° phase difference. The low insertion loss of 0.47 dB is achieved by optimizing the position of the diodes. Fullwave simulation results show that the element performance on oblique incidence remains very stable in the desired frequency band. These results verify that the proposed element has good characteristics of broad bandwidth and low insertion loss.