A Hybrid MSL/SIW-Based Feeding Network for Broadband mm-Wave Antenna Array

A Broadband series-fed linearly polarized antenna Array is presented for millimeter-wave applications. Three-dimensional hybrid MSL/SIW T-Juctions with a wide range of coupling ratios and unequal amplitude are used to build the power network with equal power distribution. For validation, four linearly polarized (LP) tapered slot antenna element arranged serially in vertical position to the feeding networks. The elements are flared in opposite directions to achieve equal phase at adjacent elements. Simulated results show that the impedance bandwidth of about 53% over the entire 23-39.7 GHz range and a maximum gain of 18.2 dBi.