Bandwidth‐size design trade‐offs for compact spline‐parameterised patch couplers by means of electromagnetic‐driven multi‐objective optimisation

Broad bandwidth and small size are the key performance figures for contemporary microwave couplers. These requirements are conflicting, i.e. improvement of one generally leads to degradation of the other assuming fixed topology of the circuit at hand. From a designer's perspective, the knowledge about available design trade-offs is indispensable as it permits for tailoring the circuit for particular applications as well as comparing alternative...