Design of a miniaturized ultrawideband and low scattering antipodal vivaldi antenna array

被引:8
|
作者
Liu, Jia [1 ]
Xu, Chengxiang [1 ]
Yu, Hang [1 ]
Su, Jianxun [1 ]
机构
[1] Commun Univ China, State Key Lab Media Convergence & Commun, Beijing 100024, Peoples R China
基金
中国国家自然科学基金;
关键词
BAND; ENHANCEMENT;
D O I
10.1038/s41598-021-92051-z
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
This paper presents a miniaturized ultra-wideband (UWB) antipodal Vivaldi antenna (AVA) array with low-scattering characteristics integrated a hybrid diffusive-absorptive metasurface. Periodic elliptical slots at the outer edges and a dielectric lens are utilized for antenna element to improve performances including miniaturized size, wide bandwidth, and high gain. The optimized element is fabricated and measured, the results demonstrate that the -10 dB impedance bandwidth is 4.5-50 GHz with a ratio bandwidth (f(H)/f(L)) of 11.1:1, and the maximum gain at 35 GHz is 12.7 dBi, which are in good agreement with simulation. By loading an optimized Minkowski-shaped metasurface as the ground reflector, which combines the multielement phase cancellation (MEPC) and EM absorption technology, the 4x4 array realizes a low radar cross section (RCS) without the radiation performance degradation. Simulated and measured results show that the proposed low-scattering array has a 10-dB RCS reduction band ranging from 5 to 50 GHz at normal incidence for both polarizations. Furthermore, the array structure shows extremely low-observable capability, which is larger than 15 dB of the RCS reduction from 7.1 to 50 GHz with a ratio bandwidth of 7.0:1. The results verify the feasibility of improving the performance of antenna and the UWB low-scattering functionality.
引用
收藏
页数:9
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