Design of 1-Bit Digital Coding Reconfigurable Reflectarray Using Aperture-Coupled Elements Controlled by PIN Diodes

In this paper, the design of a novel 1-bit digital coding reconfigurable refiectarray using aperture-coupled elements controlled by Pin diodes is presented. The reconfigurable element consists of a microstrip patch, aperture-coupled to a transmission line loaded with two Pin diodes. Each unit cell can be electronically controlled to generate two states with 180° phase difference. The two states can mimic “0” and “1” for 1-bit digital coding. By coding the sequence of “0” and “1” states, the electromagnetic waves can be manipulated to reach different functionalities. Then a $\pmb{10\times 10}$ elements array is simulated in High Frequency Structure Simulator (HFSS). The full-wave simulations present that scan beams within $\pmb{\pm 50^{\circ}}$ range can be obtained at 10.5GHz. Consistent scan beams can be obtained from 10 to 12GHz.