A band-pass frequency selective surface (FSS) structure using capacitance layers is proposed to improve the performance of angular stability. It consists of band-pass FSSs, supporting dielectrics, and capacitance layers out of band-pass FSS. The supporting dielectrics and capacitance layers work as a transmission line and capacitance impedance matcher. Through the impedance matcher, the bandwidth is stabilized, and insertion loss at passband is reduced from -0.76 dB to -0.39 dB for incident angles up to 60°. The equivalent circuit of the proposed structure is presented, and the Smith chart is given to explain the mechanism of the capacitance layers. Finally, a prototype is manufactured and measured. A relatively good agreement is obtained between simulations and measurements. Therefore, the proposed structure can be an effective solution to improve the angular stability performance of band-pass FSS design.
2. Li, D., Z. Shen, and E. P. Li, "Spurious-free dual-band bandpass frequency-selective surfaces with large band ratio," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 2, 1065-1072, Feb. 2019.
doi:10.1109/TAP.2018.2882601
3. Liu, H. L., K. L. Ford, and R. J. Langley, "Design methodology for a miniaturized frequency selective surface using lumped reactive components," IEEE Transactions on Antennas and Propagation, Vol. 57, No. 9, 2732-2738, Sep. 2009.
doi:10.1109/TAP.2009.2027174
4. Sarabandi, K. and N. Behdad, "A frequency selective surface with miniaturized elements," IEEE Transactions on Antennas and Propagation, Vol. 55, No. 5, 1239-1245, May 2007.
doi:10.1109/TAP.2007.895567
5. Li, T. W., D. Li, and E. P. Li, "A novel FSS structure with high selectivity and excellent angular stability for 5G communication radome," 2017 10th Global Symposium on Millimeter-Waves, 50-52, Hong Kong, 2017.
6. Wang, H., L. Zheng, M. Yan, J. Wang, S. Qu, and R. Luo, "Design and analysis of miniaturized low profile and second-order multi-band polarization selective surface for multipath communication application," IEEE Access, Vol. 7, 13455-13467, 2019.
doi:10.1109/ACCESS.2019.2894013
7. Liu, X., Q. Wang, W. Zhang, M. Jin, and M. Bai, "On the improvement of angular stability of the 2nd-order miniaturized FSS structure," IEEE Antennas and Wireless Propagation Letters, Vol. 15, 826-829, 2016.
doi:10.1109/LAWP.2015.2476384
8. Liang, E. and T. K. Wu, "Novel wideband frequency selective surface filters with fractal elements," Microwave Journal, Vol. 60, 102-110, Nov. 2017.
9. Parker, E. A., A. N. A. El Sheikh, C. De, and A. C. Lima, "Convoluted frequency-selective array elements derived from linear and crossed dipoles," IEE Proc. H, Vol. 140, No. 5, 378-380, 1993.
10. Yan, M., et al., "Convoluted element frequency selective surface with miniaturization and wideband response," 2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), 1-3, Chengdu, 2016.
11. Omar, A. A. and Z. Shen, "Thin bandstop frequency-selective structures based on loop resonator," IEEE Transactions on Microwave Theory and Techniques, Vol. 65, No. 7, 2298-2309, Jul. 2017.
doi:10.1109/TMTT.2017.2651812
12. Munk, B., Frequency Selective Surfaces: Theory and Design, Wiley, New York, NY, USA, 2000.
doi:10.1002/0471723770
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