Enhancing the Number of Modes in Metasurfaced Reverberation Chambers for Field Uniformity Improvement

被引:7
作者
Sun, Hengyi [1 ,2 ]
Gu, Changqing [1 ]
Li, Zhuo [1 ]
Xu, Qian [1 ]
Song, Jiajia [1 ]
Xu, Baijie [1 ]
Dong, Xiaohang [1 ]
Wang, Kuan [1 ]
Martin, Ferran [2 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Coll Elect & Informat Engn, Minist Educ, Key Lab Radar Imaging & Microwave Photon, Nanjing 211106, Jiangsu, Peoples R China
[2] Univ Autonoma Barcelona, Dept Engn Elect, CIMITEC, E-08193 Barcelona, Spain
基金
中国国家自然科学基金;
关键词
metasurface; reverberation chamber; modes; field uniformity;
D O I
10.3390/s18103301
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The use of metasurfaces to increase the number of modes, lower the operating frequency, and improve the field uniformity in reverberation chambers (RCs) is investigated in this paper. The method used to improve the field uniformity and decrease the resonance frequencies is based on increasing the number of modes by using the concept of subwavelength cavities. The resonance frequencies of a RC with metasurface wall are derived and expressed analytically in terms of macroscopic characteristics. Simulation of the reflection phase of the unit cell is then given as a guideline to choose the required microscopic parameters of the designed metasurface. The mode density in such subwavelength RCs is then obtained using a numerical eigenmode solver. Compared to traditional RCs, a much higher modal density is obtained at low frequencies. The standard deviation of the field uniformity in the test volume of the RC corresponding to different types of metasurface walls is finally compared. It is shown that by increasing the number of modes in the RC at the lower band, the operating frequency decreases and the field uniformity of the RC is improved.
引用
收藏
页数:10
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