Dispersion Properties of Four and Five Coupled Microstrip Lines in Suspended Substrate Structure using Hybrid Mode Formulation

Abstract

In this paper a full wave modal analysis is performed on four symmetric and asymmetric parallel-coupled microstrip lines and symmetric five-coupled microstrip lines in suspended substrates structures. The numerical procedure based on the modal analysis, is formulated to compute all the frequency-dependent normal mode parameters of four coupled microstrip lines structures. These parameters include phase constant, modal impedances and the dielectric losses of the coupled four lines for all four propagating modes. In addition, attempts have also been made to compute the propagation constant of various propagating modes of five-coupled microstrip lines of equal width and spacing in microstrip lines structure as well as in suspended substrate structure.

Modelling of Stratified Dielectric Medium Stripline Delay Devices

“…However, these also differ in structure. Layer of air between a suspended substrate and reference conductor shield introduces layered medium effect (Awasthi et al 2005). Very thin layers like bonding materials for adhering conductors to a PCB substrate also create multilayer structure, effect of which has to be taken into account for higher frequencies (Vo et al 2002).…”

“…In order to check if the model is adequate, three-conductor MCML was modelled and the results were compared to the ones published in (Awasthi et al 2005), which were obtained using the spectral domain method (Table 2.2). The compared results in most cases agree within 3%.…”

“…columns "Ref." denote the results published in (Awasthi et al 2005) Conductor number Further, the proposed technique was used for analysis of normal modes in symmetrically coupled four-conductor MCML. In case of four-conductor MCML four distinct modes are possible.…”