We report a single-layer frequency selective dual band reflectarray operated at 28 and 39 GHz simultaneously. The reflectarray consists of cross dipole and spiral elements aligned on the surface of a substrate and dual band frequency selective surfaces aligned on the rear side. We aligned the cross dipole and spiral elements that can control the reflection direction at 28 and 39 GHz aligned on the same plane of the substrate, resulting in a simultaneous dual-band control of the reflection direction up to ± 30° independently. Furthermore, the dual band reflectarray showed higher transmittance at frequencies except for the target frequencies, indicating the reflectarray function only at 28 and 39 GHz and does not interfere with the other communication bands.
Arbitral control of reflection direction of a reflectarray for the mobile communication system is a key technology to amplify the coverage area. Here, we examined the correlation between the tilt and rotational angles of the reflection wave acquired by a reflectarray. Simulation results showed that changing the reflection rotation angle up to 75° reduces the radar cross section (RCS) by only a few dBsm. Furthermore, the maximum scanning angle up to ± 60° was achieved by appropriate design of a reflectarrray. The reflection characteristics of the reflectarray will pave the way for the design guideline for a wide-angle reflectarray.
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