A miniaturized triband longitudinal Substrate Integrated Waveguide (SIW) slot array antenna for the millimeter-wave (mm-wave) communication - Fifth Generation (5G) application was suggested in this contribution. The antenna is developed with 4 slots over a Rogger 5880 dielectric material with 2.2 dielectric constant, 1.6mm thickness, and with 52 series metallic via's to operate in multiple bands covering mm-wave range. A SIW antenna fed with microstrip and in turn to SIW transition is involved in the design. Proposed SIW array slot antenna simulation has been carried out using Computer Simulation Technology (CST) EM simulator and fabricated. The results obtained indicate, 3 different resonant frequency bands such as 21GHz, 28 GHz, and 32 GHz & providing a fine antenna gain as 6.56, 6.55, and 8.6 dBi respectively obtained from the designed antenna. The proposed SIW structure was also seen offering an improved return loss of below 30 dB and Voltage Standing Wave Ratio (VSWR) value below 2, which is the highly anticipated one for a good antenna. The proposed antenna size is very less when compared with the other antennas which is also an important consideration for future wireless applications. An analysis has been made between simulated and measured parametric values, from that it can be found as a good candidate for improving global bandwidth limitations and apposite for triple-band 5G wireless applications.

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