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A quasi‐elliptical bandpass frequency selective surface with low‐profile and miniaturization characteristics
Author(s) -
Li Huangyan,
Costa Filippo,
Wang Yi,
Cao Qunsheng,
Monorchio Agostino
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22621
Subject(s) - miniaturization , band pass filter , wavelength , center frequency , transmission (telecommunications) , tunable metamaterials , materials science , selective surface , optics , physics , optoelectronics , computer science , metamaterial , telecommunications , nanotechnology
A low‐profile and miniaturized frequency selective surface (FSS) with dual‐polarized bandpass characteristics is proposed in this article. The FSS is a second‐order structure with two layers separated by an air spacer, achieving two transmission poles (TPs) and two transmission zeros (TZs) at both sides of the TPs. Using the miniaturized structure, the physical dimension of the element is reduced to 0.09 λ × 0.09 λ , where λ is the free‐space wavelength at the center frequency. Thus, the structure exhibits stable performance with respect to different incident angles. The overall thickness is 0.053 λ , which is much thinner than alternative second‐order FSSs using the traditional cascading technique. This feature makes it a candidate to be applied in low frequency bands with long wavelengths. In addition, the operating principle of the proposed structure is analyzed by using the equivalent circuit method (ECM) and the surface current distribution is also given. Finally, a prototype is fabricated and measured to validate the simulated results.