An X-band Broadband Metal-only Reflectarray Using Three Parallel Dipoles Loaded by Split Loop

An X-band metal-only reflectarray, which consists of three parallel metallic dipoles loaded by split square loop units, is investigated in this paper. Enough phasing range and nearlylinearly reflected phase curve benefit from the outer split square loop, which adds a resonantstructure and controls the reflected characteristic. The reflectarray is designed and simulated, which covers an aperture of $200 \times200$ mm $^{2}$. The proposed reflectarray has a lower cross-polarization, and its simulated gain, side-lobe levels, and cross polarization levels are 24.7 dB, -15.8 dB, -35dB at the center 10 GHz respectively. Its 1-dB gain bandwidth is about 20% at X-band.