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Published on: February 3, 2021
A Compact Dual-Band Frequency Selective Surface for Concurrent 5G and 6G Applications
Iftikhar Ud Din1, Daud Khan1, Fahad Ahmed1
1National Institute for Scientific Research (INRS), University du Québec, Montreal, QC H5A 1K6, Canada.
Abstract:
In this article, a dual-band frequency-selective surface (FSS) is proposed for wireless communication systems operating in the sub-6 GHz 5G band and emerging upper-mid-band frequencies considered for future wireless applications. The proposed FSS exhibits two passbands centered at 4.8 GHz and 6.9 GHz, with corresponding reflection coefficients of -33 dB and -25 dB, respectively. The associated -10 dB impedance bandwidths extend from 4.6-5.0 GHz and 6.6-7.2 GHz, providing efficient transmission within the desired operating bands. Between these passbands, the proposed structure exhibits a band-stop response centered at 5.5 GHz, where the transmission coefficient (S21) reaches a minimum value of -40 dB over the frequency range of 5.2-5.8 GHz. This intermediate stopband suppresses unwanted signal transmission, particularly within the Wi-Fi band, thereby improving spectral selectivity and reducing potential interference in multi-band wireless communication environments. Furthermore, the proposed single-layer FSS maintains stable transmission and reflection characteristics under different polarization states and oblique incidence angles up to 60°. The measured results show good agreement with the simulated responses, demonstrating the suitability of the proposed design for applications requiring dual-band transmission and intermediate band-stop filtering in next-generation wireless communication systems.
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