A 1-bit Beam Reconfigurable Reflectarray Based on PIN Diodes
In response to the problem that conventional reflectarray antennas cannot flexibly perform beam steering,which makes it unable to meet the requirements of some application scenarios,a 1-bit 12×12 beam reconfigurable reflectarray is designed,fabrica-ted,and measured.The 1-bit reconfigurable element is realized by loading PIN diode between two L-shaped structures with the same size,the element is modeled and simulated by Ansys HFSS 15,the phase difference between the two states is within the range of 180°±25° over the frequency range of 4.36 GHz～5.06 GHz,and the phase difference of 180° occurs at 4.46 GHz and 4.96 GHz.To verify 4.96 GHz,through digital control board to regulate each PIN diode independently to achieve the required phase distribution.The simulated and measured results show that the beam scanning of the reflectarray within±50° can be a-chieved at 4.96 GHz,and show a good beam scanning performance from 4.76 GHz to 5.46 GHz.Furthermore,the reflectarray is arranged in mirror symmetry to improve cross polarization,the measured cross-polarization level is-26.7 dB,the peak value of cross-polarization decreases by 15.2 dB compared with the traditional arrangement.
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