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In this paper, a modified circular loop Frequency Selective Surface (FSS) loaded on a slot antenna is proposed for sub-6 GHz 5G applications. The proposed FSS reduces the resonant frequency to lower bands of conventional circular FSS without change in its size. The operating bandwidth (−10 dB) of the proposed antenna with polarization-insensitive single-layer FSS varies from 3.6 GHz to 6.1 GHz with an average gain of 7-7.5 dB and a maximum realized gain of 7.87 dB. An FSS superstrate is loaded onto a slot antenna to increase the realized gain up to 4 dB, where the FSS shows desirable electromagnetic wave reflection characteristics over operating bandwidth and can be used in 5G sub-6 GHz band applications.

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