High order mode electromagnetic wave coupler and coupling method using proportional distributing waves

A high order mode electromagnetic wave coupler using proportional distributing waves, comprising:

• an electromagnetic wave power divider, having one or more Y-shaped bifurcated waveguides for one or more orders combination dividing a wave to the proportional distributing waves, each Y-shaped bifurcated waveguide having a rectangular waveguide as an input end thereof, an opposite end thereof being split into two rectangular waveguides, a slightly tapered section and curved waveguide being connected between the connected Y-shaped bifurcated waveguides. The last order Y-shaped bifurcated waveguide being connected the curved waveguide to distribute the waves to a position with suitable angle so that the electromagnetic wave has symmetric magnitude after passing through the power divider;
• and
• a mode-converter being comprised of a main waveguide with corresponding coupling structures on a sidewall thereof, the electromagnetic wave being coupled by the rectangular waveguides that are connected to the curved waveguide into a high order mode wave.