Design of dual-band band pass filter using transmission line sections

Abstract

In this paper introduces design of Dual-band band pass microwave filter using Z-domain approach. In this paper proposed design technique, the analog specifications of desired dual band pass filter is converted into the digital specifications. The digital filter zeros removed by an appropriate optimization technique. By apply genetic algorithm based optimization technique (DSP based) to get desired filter coefficients of dual pass band filter. The filter coefficients are computed in term of forward transfer scattering matrix (S21). These filter coefficients gives appropriate vales of characteristics impedance of open circuit stubs, short circuit stubs & transmission line sections. The theoretical result dual band pass microwave filter verified on MATLAB and ADS Simulation tool.