Use of an algebraic method for synthesis of narrow-band stepped filtering lines with various types of couplers

Description of the main steps in the synthesis of a narrow-band stepped filtering line with simple, complex, and combinational coupling elements. The proposed synthesis scheme is based on an algebraic method and employs two equivalent circuits - a stepped heterogeneous line and a normalized polynomial low-pass filter. The results of this work are applicable in the synthesis of electromechanical filters and some microwave filters.