Application of boundary integral methods to the design of planar microwave devices
Radio engineering. Electronics. Telecommunication systems
Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
AbstractThis article discusses the numerical simulation of shielded planar microwave devices in the final stages of their designing. The aim is enhancing the reliability of simulation results and improving obtained characteristics of fabricated devices. Microwave filters of different designs and ranges of frequencies from 1 to 20GHz made on polycor substrates from 0.25mm to 1mm thick were measured. Numerical modeling of microwave filters was performed by 3D finite element method (FEM) and 2.5D method of moments (MoM) using AWR EMSight. Conductors were simulated in two ways: infinitely thin sheet and metals with finite thickness. In 2.5D MoM metal thickness was modeled by adding new dielectric layer with two infinitely thin sheets connected by vias at all edges. Then numerical results were compared to the experimental data while FEM showed the best agreement with experiment. To explain the differences between FEM and MoM results of simulations, existing methods for modeling of planar microwave devices were briefly reviewed. Strengths and weaknesses of planar microwave devices simulation software based on the MoM were identified. None of the widely known programs based on the MoM appears to allow modeling complex shielded planar microwave device with accuracy comparable with FEM. Eventually, the task of developing a new modeling program based on MoM arises. With mixed potential integral equation formulation chosen to solve the problem, the software will implement 3D conductor model with finite thickness using full-wave Green's functions of a rectangular cavity with uniaxial anisotropic multilayered dielectric media.
Keywords:method of moments, boundary elements method, planar microwave device, numerical methods, electrodynamics, integral equations
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