A1-Bit Wideband Circularly Polarized Pattern Reconfigurable Reflectarray Antenna

In this paper, a circularly polarized reflection unit with 1-bit phase resolution is designed, and a $16 \times16$ reflectarray antenan is formed by using this unit. The simulation results show that the S parameter of the reflection unit is higher than -1 dB in the frequency range of 13.5 GHz to 19.0 GHz, with a relative bandwidth of 33.8%. By changing the phase distribution of the reflectarray and ensure that the realized gain is reduced within 3 dB, the maximum beam scanning angle of the designed reflectarray antenna is $\mathbf{5 0}$ degrees. The antenna designed in this paper can be used efficiently in the detection system.