A Multilayer Slot Coupled Multi-element Monopole Radiator with End-fire Radiation Pattern for mmWave Applications

In this paper, an antenna for millimeter wave (mmWave) application is presented. The antenna has a 3layered structure that uses three pairs of metallic monopoles embedded in the top substrate layer, which are fed through slot-coupled microstrips using a microstrip feed line printed below the bottom substrate. The antenna demonstrates the ability to radiate in the end-fire direction. The antenna has a -10 dB reflection bandwidth from 22.3-27.1 GHz, and the realized gain within the operating bandwidth is noted from 6.1-7.9 dBi. The proposed antenna finds its application in 26 GHz 5G mmWave frequency band and 24 GHz ISM band. The antenna can also be used as an element of a multiple-input and multiple-output (MIMO) antenna and antenna array for the massive MIMO (m-MIMO) application.