Transmission measurements between two geometrically small Vivaldi antennas performed in non-anechoic propagation conditions

The dataset contains unprocessed measurements of complex transmission (and reflection) characteristics obtained in non-anechoic regime for a geometrically small, broadband spline-parameterized Vivaldi structure. The measurement setup comprises two Vivaldi antennas with the same topology where one is used as a reference structure, and another one as the antenna under test (AUT). The transmission characteristics are measured over a distance of approximately 2m as a function AUT rotation w.r.t. the reference structure. The measurements have been performed over a frequency sweep from 0 GHz to 20 GHz.. The dataset is supplemented with the model of the Vivaldi antenna used for measurements as well as a schematic diagram of the non-anechoic test site. The measurements represent a part of the data used for post-processing for the purpose of the publication accepted to Metrologia Journal (https://doi.org/ 10.1088/1681-7575/ad10bd).