A compact metamaterial inspired sub‐wavelength unit cells are integrated into wideband Vivaldi antenna. A high gain Vivaldi antenna with 50% impedance bandwidth is proposed. The dimensions of the antenna are 1.55 λ₀ × 3.2 λ₀ at 28 GHz. Gain enhancement of 3‐dB achieved by placing metamaterial unit cells in the aperture of the antenna. These unit cells aid in phase correction of the antenna. The 1‐dB gain bandwidth of antenna is 42% with a peak gain of 12.5 dBi indicating high pattern integrity. Corrugations of varying length are introduced in the ground plane to improve front‐to‐back ratio without altering the input impedance bandwidth. The aperture efficiency of the metamaterial loaded Vivaldi antenna is 78% at 28 GHz. The proposed element is used in a stacked module to achieve wide angular coverage of 120°.

中文翻译：

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带波束切换功能的宽带高孔径效率天线，用于mmWave 5G基站

紧凑的超材料激发的亚波长单位单元已集成到宽带Vivaldi天线中。提出了一种阻抗带宽为50％的高增益Vivaldi天线。天线的尺寸是1.55λ ₀  ×3.2λ ₀在28 GHz。通过将超材料单元放置在天线的孔径中，可以提高3 dB的增益。这些单位单元有助于天线的相位校正。天线的1 dB增益带宽为42％，峰值增益为12.5 dBi，表明图形的完整性很高。在接地层中引入了不同长度的波纹，以改善前后比，而不会改变输入阻抗带宽。负载超材料的维瓦尔第天线在28 GHz时的孔径效率为78％。建议的元件用于堆叠模块中，以实现120°的宽角度覆盖。