This article introduces an innovative method for designing wide, dual, and triple band antennas tailored specifically for Wi-Fi/WiMAX applications and bands n77, n78, and n79, crucial for the evolving 5G landscape. It demonstrates three different antenna designs: the Wide Band Monopole Antenna (WMPA), Dual Band Monopole Antenna (DMPA), and Triple Band Monopole Antenna (TMPA), all using microstrip line technology. The antennas exhibit better performance within the specified frequency ranges, owing to precise optimization and advanced design enhancements. The radiators in all three of the suggested antennas are of the same type and measure 11.65 × 3.06 mm2. Each of the three antennas features an inverted T-shaped design and is constructed with a 1.6 mm thick FR4-Epoxy substrate. The antenna design is implemented on an FR-4 substrate, occupying a total area of (8 × 9.65) + (29.125 × 13.65) mm2. The suggested WMPA operates at 4.8 GHz, achieving a return loss of −31.54 dB, a peak power gain of 3.46 dB, and a −10 dB return loss bandwidth ranging from 4.14 to 5.96 GHz. The proposed DMPA exhibits −10 dB return loss bandwidths from 3.45 to 3.77 GHz and from 4.3 to 5.05 GHz, achieving resonance at 3.65 GHz with −25 dB S11 and 4.6 GHz with −15 dB S11. The proposed TMPA features −10 dB return loss bandwidths from 3.65 to 3.95 GHz, 4.06 to 5.05 GHz, and 5.42 to 6.22 GHz. It resonates at 3.7, 4.8, and 5.59 GHz, with respective S11 values of −18.9, −28.34, and −30 dB.