Study of the discontinuity equivalent circuit model for asymmetric stripline

The asymmetric stripline(ASL) is widely used in LTCC microwave integrated circuit system(MICs).Different kinds of discontinuity are often encountered in the circuit design,such as open circuits,steps,right-angle bends,T-junctions and so on.This paper successfully transplantes the equivalent circuit model of microstrip line discontinuity to the asymmetric stripline so as to deal with T-junction discontinuity and the branch-line coupler constructed by parts with various discontinuity.Compared with numerical results,the average error of S parameters is less than 2%.