Extracting modal field profiles from 3D unstructured transmission line modelling meshes for use as sources and observers

Holistic Appraisal of Modeling Installed Antennas for Aerospace Applications

“…Particularly significant steps are highlighted as [30] and [34] as these have provided the robustness to scale and complexity demanded by installed antenna applications. Supporting evidence for the accuracy and multiscale capability of UTLM as well as its industrial deployment can be found in [27][28][29][30][31][32][33][34][35] which have primarily concerned EMC problems to date.…”

“…The antenna is excited using the fundamental coaxial mode which is obtained as an eigen-solution of the discretized two-dimensional cross section of the cable [33]. It is important to emphasize that the same mesh that is used to discretize the whole antenna model is also used to characterize the excitation mode which eliminates nonphysical reflections which would otherwise be generated by either applying the theoretical solution or using an independent mode solver that may discretize the cable in a different manner.…”

“…It is important to emphasize that the same mesh that is used to discretize the whole antenna model is also used to characterize the excitation mode which eliminates nonphysical reflections which would otherwise be generated by either applying the theoretical solution or using an independent mode solver that may discretize the cable in a different manner. The method for obtaining the excitation, which is fully described in [33], has second order convergence with mesh size for the modal wave impedance and effective relative permittivity and is able to provide good approximations to the true mode profile even when the mesh size or the feed's geometrical descriptions are crude. Both the discretization and geometrical description of the cable will have an effect on the accuracy of the performance and are hence investigated in this paper.…”

“…To undertake this study we apply, for the first time, the Transmission Line Modeling method using unstructured meshes (UTLM) [27][28][29][30][31][32][33][34][35] to the problem of installed antennas. Selection of this method proceeds from the well-known fact that unstructured meshes require notably fewer sample points to capture curved and multiscale geometries and if used intelligently in a hybrid fashion with Cartesian grids to model large empty space regions, this can be achieved without unduly compromising computational efficiency or with the complexity of bespoke sub-gridding techniques.…”

Impact of In Situ Radome Lightning Diverter Strips on Antenna Performance

“…The antenna is excited with the fundamental TEM mode of the coaxial feed modulated by a time domain pulse with 3 dB frequencies of 1.8 GHz and 4.6 GHz. The fundamental TEM mode is obtained as an eigen-solution of the discretized twodimensional cross section of the coaxial cable [13,29]. All simulations in this paper are run on 60 processor cores of a commodity cluster for 2 million time steps.…”