Fig. 1. The configuration of the quasi-optical mode converter with a Denisov launcher. 1: Denisov launcher, 2~5: mirror system 6: output window

Fig. 2. Dimpled-wall waveguide of Denisov launcher

Fig. 3. Geometric optics mode of rays in the launcher

Fig. 4. (a) Variation of axial reflective angle θB to frequency f in Denisov launcher (b) Axial deviation ΔL of the broadband beam emitted by Denisov launcher on parabolic mirror 2 to frequency f in Denisov launcher

Fig. 5. Variation of structural parameter β of spiral corrugated waveguide in Denisov launcher to frequency f

Fig. 6. Variation of axial reflective angle θB and cutlength LC to tbe radius of Denisov launcher rw

Fig. 7. Variation of structural parameter β of spiral corrugated waveguide in Denisov launcher to frequency f in different radii of Denisov launcher rw

Fig. 8. The The disturbance amplitude of Denisov launcher.in TE_6.2 mode

Fig. 9. (a) The field distribution of Denisov launcher on the unrolled waveguide wall at 94 GHz in TE_6,2 mode. The white line represents the cutting position (b) The 3D field distribution of Denisov launcher on the unrolled waveguide wall at 94 GHz in TE_6,2 mode.

Fig. 10. The whole field distribution on quasi-optical mode converter at 94 GHz in TE_6,2 mode.

Fig. 11. The field distribution on the output window at different frequency points from 93~95 GHz in TE_6,2 mode.