This work presents an analysis and investigation of coplanar waveguide-fed (CPW-fed) parasitically loaded mutually coupled rectangular planar antenna for Wi-Fi5. This antenna geometry is fabricated on a 27.857 mm × 26.784 mm piece of 1.6 mm thickness FR-4 substrate. The 5.0 GHz designed antenna parameters are analyzed and investigated with parasitic loading of two rectangular stubs. This loading raises mutual coupling in the main patch and stubs and their length helps to tune the antenna at any desired frequency range between 4 and 6 GHz. The low-cost antenna attains a reflection coefficient − 21.76 dB, peak gain 7.48 dBi, directivity 7.76 dBi, and − 10 dB fractional bandwidth (FBW) of 14.39% with an efficiency of 94% at 5.28 GHz. The bandwidth from 4.96 GHz to 5.72 GHz makes the suggested antenna appropriate candidate for high-speed Wi-Fi5 (5.15–5.17 GHz), (5.17–5.19 GHz), (5.19–5.21 GHz), (5.21–5.23 GHz), (5.23–5.25 GHz), (5.25–5.27 GHz), (5.29–5.31 GHz), (5.31–5.33 GHz), (5.35–5.37 GHz), (5.37–5.39 GHz), (5.39–5.41 GHz), (5.41–5.43 GHz), (5.43–5.45 GHz), (5.45–5.47 GHz), (5.47–5.49 GHz), (5.49–5.51 GHz), (5.53–5.55 GHz), (5.57–5.59 GHz), (5.61–5.63 GHz), (5.63–5.65 GHz), (5.65–5.67 GHz), (5.67–5.69 GHz), and (5.69–5.71 GHz) bands in 5G and 6G applications. The antenna testing is obtained using a microwave analyzer (VNA) and an Anechoic chamber. The reflection coefficient and radiation in E- and H-planes are found in matching with the simulated results.