керамика ceramics 4 semiconductor 2 диэлектрическая проницаемость 2 нитрид алюминия 2 Ag 1 Fermi level 1 TWT 1 aluminium nitride 1 aluminium oxides 1 aluminum nitride 1 band diagram 1 carbides of titanium and boron 1 ceramic 1 collector 1 conductivity 1 current-voltage characteristic 1 desorption 1 dielectric constant 1 dielectric loss tangent 1 dielectric permittivity 1 dielectric support 1 grinding 1 helix 1 isolator 1 output window 1 polarization 1 relaxation process 1 scratches 1 silicon nitride 1