TY CONF TI MODELING THE ANTENNA INPUT IMPEDANCE BY THE METHOD OF MOMENTS KW numerical methods KW method of moments KW gap source KW input impedance KW antenna JO CAD/EDA/SIMULATION IN MODERN ELECTRONICS 2021 AU Klyukin, D.V. AU Demakov, A.V. AU Ivanov, A.A. AU Kuksenko, S.P. PY 2021 PB Bryansk State Technical University