TY CONF TI QUASI-ANALYTICAL CALCULATION OF THE ATTENUATION COEFFICIENT IN METAL WALLS OF LUNAR WAVEGUIDE KW quasi-analytical calculation KW attenuation coefficient KW metal walls KW lunar waveguide KW rectangular waveguide KW cutoff wavelength KW dominant mode JO CAD/EDA/SIMULATION IN MODERN ELECTRONICS 2021 AU Skvorcov, A.A. PY 2021 PB Bryansk State Technical University