Combined twist-bend with compact-size and broad bandwidth

A novel combined twist-bend with compact-size and broad bandwidth is proposed in this letter. It provides an interconnection of two waveguides with 90 degrees oriented cross-sections and a perpendicular alignment of their axes. The basic structure consists of a multi-step central waveguide and two transformer sections, which made the twist-bend with compact size and broad bandwidth. For verification purpose, a prototype has been manufactured and measured. Measurements of a WR28 combined twist-bend exhibit a return loss greater than 24 dB and a insertion loss better than 0.1 dB over the full waveguide bandwidth. Also the good agreement has been found between the simulated and measured results.

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