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.

The influence of feed-probe dimensions on the resonant frequencies in a cylindrical metallic cavity is investigated and presented. Cavity modelling is achieved by using the transmission-line matrix (TLM) time-domain method and a wire node to account for the feed-probe presence. The results of the TLM analysis are validated against the experimental results.

Belgrade is the only capital in the world at the confluence of two major international rivers navigable for global shipment—the Danube and the Sava River. However, it was only after the unification of all riversides within Yugoslavia in 1918 that Belgrade started to develop its riverfront; initially, as green recreation areas during the socialist era. Since the post-socialist transition, this trajectory has sharply changed in order to create new urban nodes along the riverfront. The best example is the newest project of the urban renewal of waterfront development at the Sava River, the “Belgrade Waterfront Project.” This mega-project has sparked a lot of attention. The aim of this research is to present, evaluate, and spatially determine this attention before and after the project inauguration. This observational study is conducted by using two methods from social discourse: a survey, as a traditional method, and analysis based on social network data (Twitter) as a newer, “smarter” one. Comparing and mapping their results, this research offers recommendations on how to harmonize and modernize the development of this crucial potential of Belgrade.

The procedure for the resonant frequencies detection in a cylindrical metallic cavity, based on transmission characteristic, is presented in this article. An analysis of procedure efficiency to resonant modes identification is conducted numerically and experimentally verified. As a numerical tool, TLM time-domain method, enhanced with the wire compact model to account for the presence of feeding and monitoring probes, is used. Also, in terms of modes identification and resonant frequency dependence of probe length, results of transmission procedure are compared with corresponding previously published results of reflection procedure [J. Jokovic, B. Milovanovic, and N. Doncov, Int J RF Microwave CAE 16: 346-354, 2006].

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.