Design of 1-bit Reconfigurable Reflectarray Based on Miniaturized Reconfigurable Unit

This paper presents a design of a single-polarization reconfigurable reflectarray based on a miniaturized reconfigurable unit. The reconfigurable characteristic of the reflected phase of the unit is realized by loading the PIN diode. Design a zigzag metal on the top layer of the unit to achieve the miniaturization of the unit, and the influence of the key structural parameters of the reconfigurable reflectarray unit on the operating frequency of the unit is studied, and the operating frequency is adjusted to 5.1GHz. The focal diameter ratio of the reflectarray is obtained from the maximum incident angle of the reconfigurable reflectarray unit, and then a feed antenna that meets the beam coverage requirements of the focal diameter ratio is designed. The minimum array size is obtained from the far field distance of the feed antenna, a $16\times 16$-scale reconfigurable array is designed, the layout of the control leads of the reflectarray unit is shown, and the array is controlled by three FPGA control chips. Measured its beam scanning far-field pattern at 5.1GHz, the sidelobe level is −11.6dB and the aperture efficiency is 27.8%.