High‐gain antipodal Vivaldi antenna with metamaterial covers. Issue 15 (11th September 2019)

• Record Type: Journal Article
• Authors: Guo, Minjie; Qian, Rongyi; Zhang, Qisheng; Guo, Linyan; Yang, Zhengwei; Xu, Ziyu; Wang, Ziye
• Is Part Of: IET microwaves, antennas & propagation. Volume 13:Issue 15(2019)
• Page Start: 2654
• Page End: 2660
• Publication Date: 2019-09-11
• Subjects: antenna radiation patterns -- permittivity -- metamaterial antennas -- UHF antennas -- microwave antenna arrays; radiation gain -- frequency band -- original AVA -- metamaterial covers -- radiation properties -- MCs -- metal rectangular ring arrays -- guiding effect -- direct electromagnetic waves -- end‐fire direction -- high‐gain antipodal Vivaldi antenna -- effective permittivity -- MSAVA -- metamaterial slab covered antipodal Vivaldi antenna -- H‐plane half‐power beamwidth -- E‐plane -- ground penetrating radar -- broadband wireless systems -- frequency 0.95 GHz to 11.0 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2019.0449
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A metamaterial slab covered antipodal Vivaldi antenna (MSAVA) is proposed to improve the radiation properties of the antipodal Vivaldi antenna (AVA). The metamaterial covers (MCs) consist of two types of metal rectangular ring arrays that have a higher effective permittivity than the substrate. The MCs can achieve a guiding effect and direct electromagnetic waves radiated from the side of AVA to the end‐fire direction. The original AVA and the proposed MSAVA are simulated, fabricated and measured. The results show that | S 11 | of the two antennas is less than −10 dB in the frequency band of 0.95–11 GHz. Due to the introduction of MCs, MSAVA obtains a much narrower H ‐plane's half‐power beamwidth, and the E ‐plane's is narrowed as well. The radiation gain is also improved in the frequency band. Moreover, the maximum gain of the proposed MSAVA is 17.67 dBi. Compared with the original AVA, the maximum gain is enhanced by 6.86 dB for the proposed MSAVA. The presented MSAVA featuring broad bandwidth, high gain and narrow beam has a high potential in ground penetrating radar, microwave imaging application and other broadband wireless systems.