This article describes an implementation of a compact wire model into the three-dimensional transmission-line matrix (TLM) cylindrical mesh for the purpose of an efficient analysis of probe-coupled cylindrical microwave cavity devices. Because of a cylindrical grid structure and empirical nature of the compact model, this implementation has to take into account a change of wire model parameters with a variable cross section of the TLM nodes through which a wire conductor passes. The model accuracy has been experimentally verified and compared with the corresponding results reached by the TLM method based on a rectangular grid in order to consider its advantages. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012.

This letter addresses the ability of the TLM method with an incorporated compact wire model, both adjusted to the cylindrical grid, to accurately model a coaxially fed patch-ring antenna together with an investigation of the computational efficiency in a modeling procedure. Design of the antenna has included an optimization of the coaxial feed location to achieve a wider bandwidth. A prototype of the antenna was fabricated and measured. It has been shown that the patch-ring antenna exhibits more than three times wider bandwidth than the classic circular patch antenna. Advantages of the cylindrical-grid-based TLM approach related to a better conformity of the orthogonal polar mesh with the structure being modeled and a better efficiency associated with a number of TLM cells in the modeling procedure have been demonstrated with regards to the rectangular-grid-based TLM method. Also, a limitation of the rectangular solver related to an inadequate modeling of narrow slots that is dependent on the mesh resolution applied has been accentuated and proved.

The transmission‐line matrix method enhanced with the compact wire model in a cylindrical grid is used for modelling of a coaxially loaded cylindrical cavity resonator with probes inserted into the cavity. Benefits of using a cylindrical grid instead of rectangular, related to precise modelling of cavity boundaries, a coaxially shaped dielectric sample and radially placed wire elements, are explored. The accuracy of the simulated results is verified by measurements of an experimental model of the cavity‐wire structure.

The impact of deformations on wearable antenna performance has been analyzed both experimentally and computationally. However, the reported results have been inconsistent and often contradictory. This paper highlights how the choice of computational mesh, namely cubic and curvilinear cylindrical mesh, that are applied to the problem of cylindrically bent antenna can affect the results and subsequent conclusions. By deploying both meshes within the same time-domain numerical algorithm means that the differences in results can only be attributable to the discretization method used. Finally, a cylindrical mesh is used to further characterize the impact of bending on antenna resonant frequency, bandwidth and radiation pattern. Bending in both E- and H- plane is considered.

This paper presents the suitability and computational features of the cylindrical TLM approach, when it is used as an accurate and efficient alternative for the analysis of the bending effect on performances of the antenna operating in an on-body mode. A design goal was to create the model of the rectangular patch antenna wrapped around the part of a cylinder, which can be used to represent a human body (torso, leg, or arm) and simultaneously to model dielectric properties of muscle tissue. Moreover, the paper illustrates problems in terms of accuracy and limitations when the antenna deformation is modelled by using numerical methods based on the cubic mesh. The advantages of the cylindrical TLM method over the rectangular TLM approach have been emphasized through an analysis of how the bending affects the resonant frequency of the antenna.