An annular-ring element for building a miniaturized bandstop frequency selective surface (FSS) structure which possesses a superior performance with respect to electromagnetic wave polarizations and incident angles is introduced in this paper. The proposed element has prominent miniaturization characteristics with a unit dimension of 0.061λ×0.061λ, where λ represents the free-space wavelength corresponding to resonant frequency. Miniaturization of the proposed FSS element is achieved by constructing special meandered strips in geometry and arranging lumped components between the elements. The advantage of this method lies in its great simplicity in tuning the resonant frequency of FSS by adjusting values of the printed capacitors rather than rebuilding the geometry. The obtained FSS also exhibits a stable performance in terms of angle stability and polarization insensitivity. Prototypes of the proposed FSS are fabricated and measured to verify design method. Measurements are well in line with simulation results.
2. Chaharmir, M. R. and J. Shaker, "Design of a multilayer X-/Ka-band frequency-selective surface-backed reflectarray for satellite applications," IEEE Trans. Antennas Propag., Vol. 63, 1255-1262, 2015.
3. Boccia, L., I. Russo, G. Amendola, and G. Di Massa, "Tunable frequency-selective surfaces for beam-steering applications," Electronics Letters, Vol. 45, 1213-1215, 2009.
4. Sivasamy, R., et al., "A novel shield for GSM 1800 MHz band using frequency selective surface," Progress In Electromagnetics Research Letters, Vol. 38, 193-199, 2013.
5. Ghosh, S. and K. V. Srivastava, "An equivalent circuit model of FSS-based metamaterial absorber using coupled line theory," IEEE Antennas Wireless. Propag. Lett., Vol. 14, 511-514, 2015.
6. Zheng, J. and S. J. Fang, "A new method for designing low RCS patch antenna using frequency selective surface," Progress In Electromagnetics Research Letters, Vol. 58, 125-131, 2016.
7. Joozdani, M. Z., M. K. Amirhosseini, and A. Abdolali, "Wideband radar cross-section reduction of patch array antenna with miniaturized hexagonal loop frequency selective surface," Electronics Letters, Vol. 52, 767-768, 2016.
8. Xie, D., et al., "Wideband absorber with multi-resonant gridded-square FSS for antenna RCS reduction," IEEE Antennas Wireless. Propag. Lett., Vol. 16, 629-632, 2017.
9. Edalati, A. and K. Sarabandi, "Reflectarray antenna based on grounded loop-wire miniaturized element frequency selective surfaces," Microwaves Antennas & Propagation IET, Vol. 8, 973-979, 2014.
10. Liu, X., et al., "On the improvement of angular stability of the 2nd-order miniaturized FSS structure," IEEE Antennas Wireless. Propag. Lett., Vol. 15, 826-829, 2016.
11. Rahmati, B. and H. R. Hassani, "Multiband metallic frequency selective surface with wide range of band ratio," IEEE Trans. Antennas Propag., Vol. 63, 3747-3753, 2015.
12. Lee, I. G. and I. P. Hong, "3D frequency selective surface for stable angle of incidence," Electronics Letters, Vol. 50, 423-424, 2014.
13. Li, B. and Z. X. Shen, "Miniaturized bandstop frequency-selective structure using stepped impedance resonators," IEEE Antennas Wireless. Propag. Lett., Vol. 12, 1112-1115, 2012.
14. Hussain, T., et al., "Miniaturization of frequency selective surfaces using 2.5-dimensional knitted structures: Design and synthesis," IEEE Trans. Antennas Propag., Vol. 65, 2405-2412, 2017.
15. Azemi, G. W., "Angularly stable frequency selective surface with miniaturized unit cell," IEEE Microwave & Wireless Components Lett., Vol. 25, 454-456, 2015.
16. Zhao, Z., et al., "A stop-band frequency selective surface with ultra-large angle of incidence," IEEE Antennas Wireless. Propag. Lett., Vol. 16, 553-556, 2017.