A High-Gain Antipodal Vivaldi Antenna With Director and Metamaterial at 1-28 GHz

Authors：Shi, Xinrong; Cao, Yunfei; Hu, Yougen; Luo, Xudong; Yang, Hua; Ye, Liang Hua^*

Source：IEEE Antennas and Wireless Propagation Letters, 2021, 20(12): 2432-2436.

DOI：10.1109/LAWP.2021.3114061

• Slot antennas
• Antennas
• Gain
• Vivaldi antennas
• Metamaterials
• Antenna radiation patterns
• Antenna measurements
• Antipodal Vivaldi antenna
• high gain
• metamaterial
• ultrawideband (UWB) antenna

An extremely ultrawideband (UWB) antipodal Vivaldi antenna with a high gain and excellent impedance matching is proposed.An elliptical-shaped director embedded in an exponentially tapered slot is employed to enhance the gain at the high-frequency band, while a metamaterial inspired structure is employed to enhance the gain around center frequency band and the symmetry of the radiation pattern at the low-frequency band. Furthermore, two sets of rectangular slits are symmetrically embedded around the tapered slot to improve the impedance matching at the low-frequency band. Based on this novel structure, an antipodal Vivaldi antenna with good impedance matching and a high gain over an extremely UWB band is successfully designed.The reflection coefficient is lower than -12 dB at 1-4.16 GHz and lower than -16 dB at 4.16-28 GHz. The gain is 4.9-11.6 dBi at 1-8 GHz and higher than 11.6 dBi at 8-28 GHz.

• Institution
  中国科学院; 广东工业大学