Design of integrated waveguide twist components

Design guidelines for single and cascaded rectangular twist components for applications in integrated waveguide technology are introduced. The structures are readily machinable by modern CNC machines. Three different design variants are developed covering twists for the lower, medium and upper frequency range of a waveguide band. Individual 90 degree twist sections are extremely short and, therefore, ideally suited for application in satellite communication waveguide bands. Only rectangular instead of L-shaped cross-sections are utilised, which significantly simplifies CAD procedures and makes software operational on personal computers. It is demonstrated that the relatively narrow bandwidth of a single 90 degree twist can be increased by cascading individual twist components. Moreover, the rectangular input and output ports can be of different cross-sections, thus eliminating the need for additional impedance transformers