Corrugated mode converters with varying wall impedance

Efficient transmission of high power microwaves and their launching can be achieved in corrugated waveguides by particular mixtures of hybrid modes. The optimum coupling of a free space Gaussian beam into a corrugated waveguide as well as forming of suitable launch patterns for diverse applications are investigated. There are many different schemes for mode conversion in corrugated waveguides to meet the specific requirements of different users. This paper reports on three different principles, a calculation method and a new type of mode converter based on varying the wall impedance, without inner diameter change.