Design of Fifth-Order Chebyshev Bandpass Filter Using Group Delay of the Reflection Coefficient Based on Space Mapping

The group delay characteristics of the reflection coefficient for circuit design are introduced. The waveguide filter is simulated with the group delay of the reflection coefficient of the circuit as the target. Due to the symmetry of the filter, the simulation parameters are halved. After obtaining the initial optimization curve, the space mapping algorithm is applied to filter design optimization. Finally, a 5-pole Chebyshev bandpass filter has been successfully designed according to the proposed design method.