Enhancing the number of modes in metasurfaced reverberation chambers for field uniformity improvement
Sun, Hengyi (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Gu, Changqing (Nanjing University of Aeronautics and Astronàutics. College of Electronic and Information Engineering)
Li, Zhuo (Nanjing University of Aeronautics and Astronàutics. College of Electronic and Information Engineering)
Xu, Qian (Nanjing University of Aeronautics and Astronàutics. College of Electronic and Information Engineering)
Song, Jiajia (Nanjing University of Aeronautics and Astronàutics. College of Electronic and Information Engineering)
Xu, Baijie (Nanjing University of Aeronautics and Astronàutics. College of Electronic and Information Engineering)
Dong, Xiaohang (Nanjing University of Aeronautics and Astronàutics. College of Electronic and Information Engineering)
Wang, Kuan (Nanjing University of Aeronautics and Astronàutics. College of Electronic and Information Engineering)
Martín, Ferran, (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Date:	2018
Abstract:	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.
Grants:	Ministerio de Economía y Competitividad TEC2016-75650-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1159
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Metasurface ; Reverberation chamber ; Modes ; Field uniformity
Published in:	Sensors (Basel, Switzerland), Vol. 18, Issue 10 (October 2018) , art. 3301, ISSN 1424-8220

DOI: 10.3390/s18103301
PMID: 30275373

10 p, 7.4 MB

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