Synthesis and design of four pole ultra-wide band (UWB) bandpass filter (BPF) employing multi-mode resonators (MMR)

A complete synthesis and design of fourth order UWB BPF has been presented in this paper. Based on MMR, equivalent circuit is used to derive transfer function which is then used to extract the filtering function. For optimal solution, mathematical formulation is used to calculate characteristic impedance of filter in order to have chebyshev type frequency response. To validate the synthesis a prototype is designed and fabricated. Experimental results show good agreement with proposed synthesis.