Reflectarray Antenna Based on Separated Parallelogram Unit Cell Fed by a Circularly Polarized Vivaldi Antenna

초록

This paper proposes a compact reflectarray antenna based on separated parallelogram unit cells. Each cell comprises a PB (Pancharatnam-Berry) phase circular patch with a cross-shaped slot, converting incident RHCP to reflected LHCP while providing continuous 0-360 phase control. The separated ground enables a deployable structure, and its cross slot shifts the transmission resonance out of band, stabilizing the reflection magnitude. At 14 GHz, a 2020 array achieves a peak realized gain of about 23 dBi in the main beam, which is 13 dB higher than a standalone Vivaldi feed (9.5 dBi) under identical conditions. The axial ratio around the main beam remains below 3 dB, confirming good circular polarization. The proposed reflectarray offers a low-profile and practical solution with substantial gain enhancement. © 2026 European Association of Antennas and Propagation.

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