Abstract
In this study, a convoluted and connecting unit structure to design a frequency selective surface (FSS) with miniaturised closely spaced dual-bandstop is presented. Using −10 dB transmissions as the threshold for operating bandwidth, the proposed FSS possesses two stopbands with central operating frequencies of 3.4 GHz and 4.9 GHz with bandwidths of 950 MHz (2.80–3.75 GHz) and 850 MHz (4.55–5.4 GHz), respectively, and a band ratio of just 1.44. The unit dimension of the proposed FSS is 0.069λ1 × 0.069λ1, where λ1 represents the first resonant wavelength in free space. This FSS structure exhibits excellent miniaturisation properties. In addition, the proposed FSS exhibits excellent stability for both transverse electric (TE) and transverse magnetic (TM) polarisations under incident angles from 0° to 60°. Finally, the FSS sample was fabricated and measured. The simulation results are in good agreement with the measured results. The biggest innovation of this study is to use the old method to solve the new problem, that is, to realise the shielding of fifth-generation (5G) signal by using the method of convoluted and connecting FSS. The design will be of significance in further development of 5G communications.
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