Mode filtering based on ponderomotive force nonlinearity in a plasma filled rectangular waveguide

Here a new scheme for mode filtering is proposed. Based on the ponderomotive force effect, propagation of the microwave dual-mode through a plasma-filled metallic rectangular waveguide is investigated. To excite the TE₂₀ mode in a rectangular waveguide, the existence of fundamental modes is unavoidable. To filter the destructive mode (TE₁₀), the waveguide is filled with a collisional plasma. Based on the coupling effect, the energy of this destructive TE₁₀ mode is transferred to the TE₂₀ mode. The proposed structure acts like a mode convertor. The TE₁₀ mode become more attenuated and instead the TE₂₀ mode is amplified. The plasma filled rectangular waveguide acts as a mode filtering tool.