Method for establishing ultra wide band class i chebyshev multi-section wilkinson power divider having equal ripple isolation characteristic

A method for establishing an ultra wide band (UWB) class I Chebyshev multi-section Wilkinson power divider having equal ripple isolation characteristic, comprising the following steps:

• step 1, determining a Chebyshev equal ripple order required in the designed circuit and calculating a class I Chebyshev polynomial in the same order, and meanwhile determining the equal ripple heights of reflection function S11 and isolation function S32;
• step 2, carrying out even mode analysis on the power divider, selecting a model according to the Chebyshev equal ripple order so as to calculate an ABCD matrix expression under the even-mode condition calculating equivalent conditions according to the ABCD matrix expression and the class I Chebyshev polynomial so that the designed circuit satisfies the structure of the Chebyshev polynomial and then a Zie impedance value of each section of coupled line is obtained;
• step 3, carrying out odd-mode analysis on the powder divider so that each zero position and each peak ripple position of the isolation function S32 and the reflection function S32 are the same, and then the Zio impedance value of each section of coupled line and the impedance value of each isolation resistor are obtained;
• and
• step 4, establishing a final circuit according to the Zie impedance value, the Zio impedance value and the impedance value of each isolation resistor.