A single layer and very close band spacing frequency selective surface with enhanced isolation

Abstract

An ultrathin and very closely located dual-band frequency selective surface (FSS) with enhanced isolation is proposed in this letter. The unit cell consists of two typical concentric hexagon rings, with several stubs loaded on each side of the inner ring. Through the stub-loaded configuration, the mutual coupling of adjacent resonators is highly decoupled and a very close band spacing FSS with better isolation can be achieved, and the ratio of the two operating bands can be as low as 1.06. Additionally, due to the independent resonant frequencies, the band ratio can be set over a wide range, from 1.06–2.43. Furthermore, the corresponding equivalent circuit model (ECM) is developed and analyzed for better comprehension of the underlying mechanisms of the proposed FSS. The validity of the design is then checked with a prototype, and the measured results show good agreement with the simulated ones.

KEYWORDS:

• Frequency selective surfaces (FSS)
• closely spaced bands
• mutual coupling
• enhanced isolation

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [Grant Number 62001389].

Notes on contributors

Yu-Xu Chen

Yu-Xu Chen, he is currently pursuing his PhD at Northwestern Polytechnical University (NWPU). E-mail: [email protected]

Guobin Wan

Guobin Wan was born in 1967. He is now a professor and doctoral supervisor of the School of Electronic Information, Northwestern Polytechnical University. His main research interests include analysis and design of radome, antenna theory and numerical analysis of electromagnetic scattering. E-mail: [email protected]

Xin Ma

Xin Ma was born in 1984. She received her Ph.D. degree in electronic science and technology from Northwestern Polytechnical University, Xi'an, China, in 2014. From 2018 to 2019, she was a visiting scholar with the Department of Electronics and Nanoengineering, Aalto University, Aalto, Finland. She is currently an associate professor of the Department of Electronics and Information, NWPU. Her current research interests include frequency selective surfaces and metasurface waveguides. E-mail: [email protected]

Bin Fu

Bin Fu, he is currently pursuing his PhD at Northwestern Polytechnical University. E-mail: [email protected]

Xinhui Jiao

Xinhui Jiao, he is currently pursuing his PhD at Northwestern Polytechnical University. E-mail: [email protected]

Nan Wang

Nan Wang, she is currently pursuing her PhD at Northwestern Polytechnical University. E-mail: [email protected]