Mutual coupling and sensitivity investigations of SIW-based antipodal linear tapered slot antennas in 1-D and 2-D array configurations

A comprehensive study of the impacts of mutual coupling in computationally expensive antenna arrays is presented. Single- and dual-polarized antipodal linear tapered slot antennas (ALTSAs), which are fed by coplanar waveguides (CPWs) and substrate integrated waveguides (SIWs), are arranged in 1-D and 2-D array configurations, operating between 21 GHz and 31 GHz. The influence of mutual coupling and element spacing sensitivity on radiation properties as well as return loss performances in 1-D and 2-D arrays are presented and discussed. The broadband performance of the individual array antenna element on low-permittivity substrate is verified by measurements.