Effect of Narrow, Vertical Slots in X-Band Waveguide on Plasma Propagation Coefficients

Transmission characteristics are considered for a plasma test section consisting of a rectangular channel orthogonally intersecting a rectangular waveguide. Reflection and transmission coefficients for closed and slotted waveguide (cwg, swg) are compared at 9.385 and 10.0 GHz with those of the test section, taking into account the wall openings due to the channel. These quantities are presented graphically for several waveguide widths in terms of the normalized plasma frequency squared (omega squared sub p/omega squared), normalized collision frequency (nu/omega), and width of the opening in the side walls equal to the width of the channel (L). The results show that for L 0.08 Lambda sub 0, meaningful data require that the effects of the wall openings be taken into account. The differences in the transmission coefficients for the cwg and the swg increase for increasing value of collision frequency, decreasing value of electron density, increasing waveguide width, and increased width of the opening. (Author)