Design of Microwave Stepped Impedance Circuits

This report explains the intuitive technique for designing the Microwave stepped impedance circuit. Microwave low pass filter suppresses the unwanted harmonics above the cut-off frequency. Two methods are discussed in detail namely image parameter method and insertion loss method. A low pass network can be represented by a quotient of finite degree rational polynomials, it is necessary to approximate it. The four classical solutions to the approximation problems are also elaborated, the Butterworth (maximally flat), Chebyshev (equal ripples in pass band), inverse Chebyshev (equal ripples in stop band) and elliptical (equal ripples in stop and pass band).