Analysis and optimization of a Turn of a Meander Line with Broad-Side Coupling with Temperature Effect Consideration

The paper presents the results of analysis and optimization of a turn of a meander line with broad-side coupling performed by evolutionary methods. The study took into account the ambient temperature in the range from minus 50 to 150°C using a simple temperature model of the linear change of turn parameters. As a result of the analysis, it was revealed that a temperature change over the entire range leads to a decrease in the per-unit-length delays of the even and odd modes up to 2.35% and 3.24%, respectively. Meanwhile the maximum amplitude of the pulse signal at the turn output increases up to 1.31%, and the impedances of the even and odd modes increase up to 2.4% and 3.56%, respectively. The results demonstrated the possibility of parametric one- and two-criterion optimization of the turn cross-section using two methods: genetic algorithms and evolutionary strategies. The optimization results by two methods showed good agreement. However, with close sets of optimal parameters, the time for optimization by evolutionary strategies was 9 times less.