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Millimeter and microwave wave components are in high demand, which will have a substantial influence on the development of 5G networks. In this work, Ridge Gap Waveguide is used to develop a planar high-gain antenna. The main objective of this study is to develop a wideband, high-gain antenna capable of supporting the expected need for high data transmission in the future. For this reason, a thorough examination of PRGW has been presented, along with a series of high-gain antenna designs that have been extensively tested. In the future, this antenna array might be used for 5G connectivity, and it meets all mm-wave band specifications. We have designed a novel tri slotted PRGW antenna which size is small (3.256x3.256x0.03 mm3), but the gain, bandwidth, directivity and rad efficiency is high with respect to other larger PRGW antenna. Although the volume of the proposed antenna is small, also it provides better Gain, Directivity and VSWR with respect to the larger conventional PRGW antenna. Directivity, gain and rad efficiency is increased when the tri slot is mounted on the substrate. It can be said that this antenna is suitable for ultra-wideband wireless communications, remote sensing, satellite newsgathering, disaster management, etc.