Design of Microstrip Bandpass Filter Based on Genetic Optimization

In this paper, Structural optimization based microstrip bandpass filter design is discussed. Conventional optimization mainly focuses on the dimensional optimization of the filter. Here, the focus is to design a bandpass filter using rectangular patch-based resonator. The obtained result is then optimized using Genetic Algorithm which is part of Evolutionary algorithm. In order to obtain an optimized result, we define a fitness function in terms of $S_{11}$ (dB) and $S_{21}$ (dB) parameters. The final design of the filter will possess maximum transmission co-efficient and minimum reflection co-efficient.