A Wideband Profile‐Reduced Transmitarray Antenna Based on Phase‐Shifting Elements

ABSTRACT A wideband with profile‐reduced transmitarray antenna based on phase‐shifting elements is proposed in this letter. The element of transmitarray comprises three metal layers with a double‐slotted metal ring aperture and two dielectric layers. The stable transmission coefficient is achieved with compact coupled structures. The simulated electric field on the reference plane is analyzed to optimize the focal‐to‐diameter ( F/D ) ratio. Furthermore, a precise optimization method by reducing the phase error in the phase compensation scheme is designed to improve the gain bandwidth of antenna. The optimized transmitarray is fabricated and measured, which consists of 20 × 20 elements. The F/D ratio is reduced by 27%, and the 1‐dB and 3‐dB gain bandwidths are 22.90% and 28.75%. The peak aperture efficiency reaches 43.06%. The optimization scheme can be applied for broadbanding design of transmitarray with a limited profile height.