Growth-based computer aided design strategies for multimode waveguide design with the aid of functional blocks

[摘要] ENGLISH ABSTRACT:A new technique for the design of multimode devices in overmoded waveguide is presented.The technique applies the principle of growth-based design and uses a conceptual functionalblock representation of the design structure to provide necessary flexibility to the designalgorithms. Two growth based design strategies are proposed and evaluated. The first uses ageneralized synthesis-oriented scanning technique, and the second uses an evolutionarystrategy. The techniques provide reliable solutions to a variety of multimode design problems.In order to facilitate sufficiently fast numerical analysis, novel enhancements of the modematching technique are developed and the use of surrogate models is investigated. In addition,to allow physical evaluation of the finished devices, original techniques of measuringmultimode devices are formulated and utilised.Two practical problems are used to evaluate the performance of the design procedures. Thefirst is the design of overmoded waveguide chokes for microwave heating facilities, and thesecond is the design of multimode horns for antenna and spatial power combiningapplications. Various examples of each type of problem are presented with measurements ofmanufactured solutions.

[发布机构] Stellenbosch University