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On the bandpass/lowpass microwave/RF filter simplified solution of the lumped-distributed network realization

This paper presents a practical possibility of realization of a filter with simultaneous band-pass and low-pass characteristics within one simple, microstrip mixed circuit with lumped components. In particular, it was important to obtain an arbitrary, narrow-band microwave filter — BPF — with a fractional bandwidth of 10%, and a low-pass filter with favorable RF characteristics up to several hundred-MHz. The proposed simplified design method and transformations provide good theoretical and experimental results. One model of the distributed/lumped filter which confirms the theory as to the realization of the filter was designed and experimentally made.