Electrodynamical properties of a "grid" volume resonator for travelling   wave tube and backward wave oscillator
  The electrodynamical properties of a volume resonator formed by a perodic structure built from the metallic threads inside a rectangular waveguide ("grid" volume resonator) is considered for travelling wave tube and backward wave oscillator operation. Peculiarities of passing of electromagnetic waves with different polarizations through such volume resonator are discussed. 
V. Baryshevsky, A. Gurinovich