In article was researched, the possibility of improving the characteristics of Vivaldi antenna by use of printed lens located in aperture. It is shown that use of lens leads to increase in gain and reduce level of side lobes. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:369–371, 2014

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An original UWB antenna design, which is a symmetric electric vibrator, powered by an exponentially expanding slot line with significant radiation losses.

Article describes the methods of approximation of electromagnetic field spatial distribution, which spatial samples are measured using an annular antenna array located near scatterer with a priori unknown geometry and material properties. As example, case of mobile phone located at user’s head were studied. The model of the human head and hand was simulated as a layered structure, the outer layer imitated the skin, and water was used as the inner filling. The study results show good performance of modified method of forming a “virtual” antenna array, which can significantly reduce the field approximation error, thereby making it possible to successfully predict the electromagnetic field phase structure at distances exceeding the radius of the used antenna array by three times. Proposed method can significantly increase the efficiency of subspace methods of direction finding and methods of adaptive signal processing in multichannel systems (in particular, the MIMO) due to the multiple increase in the number of virtual channels which are functionally equivalent to additional real channels, and also - increasing the electrical dimensions of the antenna system (“virtual” antenna array).