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Oversized waveguide are widely used in high power and high frequency microwave setups. Low modes in such waveguides have relatively low losses in gaps several wavelengths long [1], which make it possible to use waveguide gaps for DC insulation. Further optimization of DC breaks is possible by introducing waveguide taper converters at both sides, which are designed to increase beam quality and increase waveguide radius at its ends. The method of synthesis of such converters developed earlier by authors allowed to decrease the losses by an order of magnitude or more in comparison to simple break [2], but improvements are possible to make the converters smaller and keep losses near the theoretical minimum limited by diffraction.

Waveguide DC breaks for TE01 and HE11 microwave transmission lines

Waveguide DC breaks for TE₀₁ and HE₁₁ microwave transmission lines