The use of lattice networks for modelling symmetric transmission line components and discontinuities

This article proposes the lattice network as a beneficial alternative to T- and topologies for modeling symmetric transmission line discontinuities and components.The lattice network presents some important features, which make it a powerful tool to find realizable equivalent circuits. The limitations of the T- and topologies and the validity of the lattice network in terms of realizability are highlighted in this article through two microstrip components: a dumbbell-shaped defected ground structure and a microstrip stepped-impedance hairpin resonator. Moreover, the lattice image impedance is proposed here as a parameter that allows determining whether a branch of the network is predominant. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:636–639, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27385