Abstract
A new methodology to design a microwave filter is discussed. The filter designed is a Butterworth low-pass filter of order five which is obtained in digital domain using chain scattering parameters for serial transmission lines and a shunt-connected open-circuited stub. Colliding Bodies Optimization (CBO) algorithm is used for approximating the magnitude response of desired transfer function with the ideal one. Superiority of the results obtained from CBO in comparison to some widely used optimization algorithms, viz., real-coded genetic algorithm, gravitation search algorithm, and particle swarm optimization is shown. It is seen that CBO outperforms the other algorithms in terms of magnitude error parameters with passband and stopband error values of −43.62 dB and −48.205 dB, respectively. Afterward, the obtained configuration is then simulated on ADS using the substrate Rogers RO3003 having permittivity value of 3 and 0.75 mm thickness. The microstrip Butterworth low-pass filter is found to have 3.4 GHz cutoff frequency which is capable of covering various microwave applications.
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