A Novel 2.5-Dimensional Ultraminiaturized-Element Frequency Selective Surface

• Published in: IEEE transactions on antennas and propagation 2014-07, Vol.62 (7), p.3657-3663
• Main Authors: YU, Yi-Min, CHIU, Cheng-Nan, WU, Tzong-Lin, CHIOU, Yih-Ping
• Format: Article
• Language: English
• Subjects: Angle of incidence; Angle stability; Applied sciences; Boards; Capacitance; Circuit boards; Circuit stability; Computer simulation; Couplings; Design engineering; Deviation; Diffraction, scattering, reflection; Equivalent circuits; Exact sciences and technology; Frequency selective surfaces; Integrated circuit modeling; Mathematical models; miniaturized-element frequency selective surfaces (FSSs); polarization stability; printed circuit board; Printed circuit boards; Radiocommunications; Radiowave propagation; Resonant frequencies; Resonant frequency; spatial filter; Telecommunications; Telecommunications and information theory
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2014.2321153

This paper proposes fabricating a new 2.5-dimensional ultraminiaturized element on a cost-effective printed circuit board to build a frequency selective surface (FSS). The proposed element consists of two main parts: a planar tapered meandering line (PTML) and a vertical via-based meandering line (VVML). Compared with previous published two-dimensional miniaturized elements, the proposed element is smaller (only 3.3% of the free space wavelength at the resonant frequency) and exhibits high resonant stability at various polarizations and incidence angles (only 0.4% deviation at the resonant frequency when the incident angle is as great as 75°). In particular, the introduction of VVML in the element substantially improves the FSS performance. A third-order equivalent circuit model was established to model the FSS performance precisely. This model can be reduced to a simpler first-order model, thus enabling the resonant frequency of the FSS to be predicted quickly. A prototype of the ultraminiaturized-element FSS was created and examined. The results of the proposed models, full-wave simulation, and measurement exhibited satisfactory consistency.