Experimental verification of anomalous spectral features of SKALA4.1 antenna

In this communication, we present a detailed measurement process of the SKALA4.1 antenna frequency response as the $S_{21}$ of its coupling with a reference antenna in an anechoic chamber environment. This is the first experimental evidence of anomalous spectral features of SKALA4.1 antenna. We validate the consistency of the results by examining the error between measurement and a corresponding FEKO simulation. Finally, we pinpoint all the spectral features inherent in SKALA4.1 antenna and examine their occurrence in measurement and simulation.