Tijana Dimitrijevic

University of Niš | NIS · Faculty of Electronic Engineering

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 cylindricall...

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...

Accurate near-field measurements for either deterministic or stochastic electromagnetic fields characterization require a relevant process that removes the influence of the probes, transmission lines, and measurement circuits. The main part of the experimental work presented here is related to a calibration procedure of a test setup consisting of a...

Numerical computational methods on a Cartesian grid and analytical approaches face many problems and limitations when modeling antenna structures of circular/cylindrical geometry is concerned. This paper presents possibilities and computational demands of the cylindrical TLM approach with a wire modeling ability, implemented through in-house develo...

This paper introduces a design of a frequency adjustable dual-band circular patch antenna with a gap-ring-slot accompanied by a study of a cylindrical TLM method effectiveness and capabilities. The antenna is fabricated on Rogers 4003 substrate and measured results have been used to validate the used approach. Through comparison with corresponding...

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 loca...

This paper investigates possibilities and advantages of the integral cylindrical TLM method when the subject of modelling is a coax-fed circular patch antenna with a shorting pin and an annular ring. To point out advantages of the cylindrical TLM mesh, obtained results representing S11 parameter and input impedance of the modelled antenna are compa...

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 sa...

3-D TLM approach based on the cylindrical grid and enhanced with the compact wire model has been used for modelling of an inverted circular microstrip patch (IMCP) antenna with the coaxial feed. The simulated results have been compared with the measured results and rectangular grid based TLM results. Additional, the influence of the air gap height...

This paper explores applicability of the integral TLM method in a cylindrical grid for the purpose of modelling of coax-fed microstrip antennas in configurations of the circular patch antenna and cavity-backed inverted microstrip antenna. Obtained results representing S11 parameter are compared with corresponding results reached by the rectangular...

The purpose of this paper is to investigate accuracy and advantages of the TLM method in a cylindrical grid enhanced with the compact wire model when the subject of modelling is a circular patch antenna with a coaxial feed. Obtained results representing S11 parameter are compared with corresponding results reached by the rectangular grid based TLM...

This paper explores the effectiveness of the Transmission-Line Matrix (TLM) method based on the cylindrical grid for the purpose of an analysis of a cavity with a circular cross-section and coaxial load. To consider the advantages of the cylindrical over rectangular TLM grid, coaxial inner load with different dielectric properties and dimensions ha...

This paper describes an implementation of a compact wire model into the 3-D TLM cylindrical mesh for the purpose of an efficient analysis of probe-coupled cylindrical microwave cavity devices. Due to a cylindrical grid structure and empirical nature of the compact model, this implementation has to take into account a change of wire model parameters...

This paper explores the effectiveness of the TLM method based on the cylindrical grid for the purpose of an analysis of a cavity with a circular cross-section and coaxial load. To consider the advantages of the cylindrical over rectangular TLM grid, coaxial inner load with different dielectric properties and dimensions have been used. Obtained nume...

This paper presents the procedure of compact wire model implementation in the 3-D TLM cylindrical mesh. It is based on the wire structures parameters calculation in conditions of variable cross-section of the TLM nodes through which wire conductor passes due to nature of cylindrical grid along the wire path. Efficiency of the wire model adapted to...

A microwave applicator based on metallic cavity with a waveguide used to launch the energy from the source into the cavity is modelled using time-domain 3-D TLM method enhanced with model for modelling of wire and boundaries. An influence of waveguide length on EM field distribution inside the cavity is analyzed, in terms of modes presence and corr...