This work contributes a compact FSS antenna novel dual-band miniaturized planar antenna for 5G Sub 6 GHz implementations and its design considered the challenge of designing an antenna with reduced dimensions, which in turn is expected to be more cost-effective to produce and exhibit lower interferences compared to existing market solutions. The low-loss double-layered miniaturized rectangular microstrip antenna consists a dipole strip array mirror reflector frequency selective surface (FSS) layer beneath the antenna ground at an optimized gap that makes the antenna multi-layered and improves its directional radiation characteristics. The existing antennas are based on the same principle of Fabry–Perot cavity interference and achieve ultra-wideband (UWB) bandwidth with a larger substrate size. Therefore, they have in-band applications interferences issues with 5G. These issues are remedies by reduction in the UWB bandwidth and substrate size miniaturization trade-off. A 74.11% antenna size miniaturization is achieved with a 47.6% reduction in the –10 dB bandwidth in comparison to the base antenna of size 49 × 49 mm². The introduced notch-band (5.63–5.85 GHz) bifurcate the UWB bandwidth. Therefore, the notch band works as the boundary between the extra-applications bands (5.85–8.62 GHz) and 5G applications band (1.70–5.63 GHz) and eliminates in-band applications interferences. The overall volume of the 3D antenna is controlled by optimizing the two substrates gap. A parametric study of the modified miniaturized antenna dimensions has been conducted, and the simulation results were validated through experimental measurements. Since the antenna covers almost FR1 (1.0–6.0 GHz) range, therefore, it is the most appropriate candidate for all 5G bands including the main n77 (3.3–4.2 GHz), n78 (3.3–3.8 GHz), and n79 (4.4–5.0 GHz), Global System for Mobile Communication, Personal Communication Services (PCS), Wi-Fi/WLAN/Bluetooth, Wi-MAX (3.5 GHz), HiperLAN (5.8 GHz), C-band (5.85–8.0 GHz), and Lower 6G band (7.125–8.40 GHz) applications.

A CPW-Fed microstrip patch antenna of size 21×22×1.6 mm ³ along with its three variants is proposed in this paper. Two slots are introduced on the patch of the base antenna to study the antenna parameters, in terms of bandwidth, gain and directivity for analysis. The proposed antennas are suitable for wireless wideband applications roughly between frequency ranges of 4 GHz to 14 GHz approximately. All three antennas are showing good return losses, high bandwidth of approximately about 10 GHz, peak gain and directivity of approximately 4 dB. The microstrip antenna structures are configured on FR4 epoxy substrate. The configurations are simulated and analyzed using Ansys HFSS software. This study would be helpful in the designing of compact microstrip antennas with enhanced bandwidth for various purposes in the field of wireless communications in general and various earth science applications in particular at super high microwave frequency.