首页|High-Efficiency Wideband Transmitarray Antenna Using Polarization-Rotating Elements with Parasitic Stubs
High-Efficiency Wideband Transmitarray Antenna Using Polarization-Rotating Elements with Parasitic Stubs
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A high-efficiency polarization-rotating transmitarray antenna(TA)using wideband elements is pro-posed for millimeter-wave applications.The polarization-rotating element consists of three metallic layers and two substrates.Orthogonal polarizers are employed on the top and bottom of the element.And the split ring with a parasitic stub on the middle layer is symmetric about the diagonal,performing the polarization rotation and phase compensation simultaneously.A parasitic stub is designed to decrease transmission loss and broaden the bandwidth.The periodicity of the element is only 1/4 wavelength at 30 GHz.A prototype TA with 28 × 28 elements is designed,fabricated,and measured.The measured peak gain reaches 27.5 dBi at 37.8 GHz.The 1-dB gain drop bandwidth is 30.8-40 GHz(26.0％).The aperture efficiency reaches as high as 71％at 31.5 GHz.Within the bandwidth of 26.5-38.8 GHz(37.7％),the aperture efficiency is higher than 50％.The proposed polarization-rotating TA features wide bandwidth and high effi-ciency,demonstrating great application potential for 5G millimeter-wave communication.
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