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

Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
CIMITEC, Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Authors to whom correspondence should be addressed.
Sensors 2018, 18(10), 3301;
Received: 11 July 2018 / Revised: 4 September 2018 / Accepted: 5 September 2018 / Published: 1 October 2018
(This article belongs to the Section Physical Sensors)
PDF [7615 KB, uploaded 1 October 2018]


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. View Full-Text
Keywords: metasurface; reverberation chamber; modes; field uniformity metasurface; reverberation chamber; modes; field uniformity

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Sun, H.; Gu, C.; Li, Z.; Xu, Q.; Song, J.; Xu, B.; Dong, X.; Wang, K.; Martín, F. Enhancing the Number of Modes in Metasurfaced Reverberation Chambers for Field Uniformity Improvement. Sensors 2018, 18, 3301.

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