Novel Rigorous Multimode Equivalent Network Formulation for Boxed Planar Circuits with Arbitrarily Shaped Metallizations

TL;DR

This paper extends the Multimode Equivalent Network method to analyze complex, arbitrarily shaped multilayer planar circuits within metallic enclosures, enabling accurate modeling of shielded microstrip devices with validation against commercial tools and experiments.

Contribution

It introduces a novel formulation of the MEN for arbitrary shaped metallizations in multilayer planar circuits, including internal and external ports, validated through practical examples.

Findings

Good agreement with commercial tools

Accurate analysis of complex geometries

Effective validation with experimental data

Abstract

The Multimode Equivalent Network (MEN) formulation has been traditionally employed for the efficient and accurate analysis of waveguide devices. In this paper, we extend the use of the MEN to the analysis of zero thickness, multilayer planar circuits in a metallic enclosure. The formulation is developed for arbitrary shape metallic areas and includes both internal and external ports in the transverse plane. The BI-RME method is applied to analyze the arbitrary shaped metallizations and to compute the coupling integrals needed to solve the corresponding integral equations. On this basis, typical shielded microstrip circuits of complex geometries, are analyzed in the common frame of the MEN technique. To validate the theoretical formulation, several shielded filtering microstrip structures are analyzed, showing good agreement with respect to both other commercial tools and experimental measurements.