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This work presents an eight element array antenna with single layer frequency selective surface (FSS) to obtain high gain. The eight elements are fed by single port. The FSS consists of 14 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 6 unit cells with one unit cell size is 5 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 5 mm<sup>2</sup> having wideband behavior. The antenna uses Rogers RT Duroid 5880 substrate and giving very wide bandwidth from 20 GHz to 65 GHz, covering millimeter wave 5G bands (including 28 GHz, 38 GHz and 60 GHz). The designed FSS is showing stop band transmission characteristics below &#x2212;10 dB threshold from 25 GHz to 42 GHz and 59 GHz to 61 GHz. The eight element antenna integrated with the FSS reflector, which results an improvement in the gain level from 12 dB to 15 dB at 28 GHz, from 10 dB to 12 dB at 38 GHz, and from 9.5 to 11 dB at 60 GHz. The dimensions of the antenna are 65 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 27 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 0.857 mm<sup>3</sup>. The proposed antenna shows stable gain and directional radiation patterns. The simulation findings are experimentally confirmed, by testing the fabricated prototypes of the proposed antenna system.

Wideband and High Gain Array Antenna for 5G Smart Phone Applications Using Frequency Selective Surface