Application of anisotropic absorbers to the analysis of MMIC devices by the finite element method

Abstract

Anisotropic material characteristics can be exploited to construct absorbers that provide reflectionless interfaces for waves at arbitrary incident angles. Since their computer implementation requires the specification of appropriate material characteristics only, these Perfectly Matched Layers (PMLs) allow for simple but accurate mesh truncation schemes for the finite element method. The present paper extends the concept of PMLs to waveguides of inhomogeneous cross-sections and layered media. We describe the use of generalized PMLs in a software package for (M)MIC devices and demonstrate the benefits of the suggested approach by two numerical examples.

Analysing microwave devices using a symmetric coupling of finite and boundary elements

“…where r is the relative permittivity, and k 0 = 2 0 0 is the wavenumber in free space. Moreover, we comment that the treatment of the impressed port current J p i has been described in full in Reference [17].…”

“…Following Costabel's approach in Reference [11], the symmetric coupling of FEM and BEM is achieved by splitting the surface integral term in (22) into two halves. One half is left intact while the other is substituted from the right-hand side of (17). This crucial modification, along with the appropriate testing of (16) and (17), leads to the symmetric FEBE hybrid formulation.…”

Self‐adaptive fast frequency sweep for the finite element analysis of waveguide modes

“…In principle, the proposed method can be extended to open waveguides, with the help of perfectly matched layers (PMLs). However, PMLs require complex diagonal materials tensors [Sacks et al, 1995;Dyczij-Edlinger et al, 1996], which have not yet been implemented in the authors' FE codes.…”

The quest for perfect electromagnetic absorber: a review

“…Electronic circuits and devices that operate at higher frequencies are a major source of EM radiation and require the use of suitable shielding solutions to prevent spurious radiations arising either from its own components and circuitry or from the nearby systems and devices. Absorbers are essential for diminishing the mutual coupling of closely placed antennas [140], mitigating the harmful effects of cavity resonance in enclosed monolithic microwave integrated circuits (MMIC) [141], alleviating the effect of apertures in metallic cavities and attenuating surface waves. A variety of customized absorbers are used to ensure proper EMI level for diverse high-frequency devices and applications.…”