This paper, featured in the July 2015 issue of Microwave Journal, provides a technical comparison of 3D planar EM simulation with fully arbitrary 3D EM simulation and informs users as to which EM approach/formulation may work best for a given application.
This is a list of published papers and articles that reference our software.
Entries in Modeling And Simulation (42)
To meet the increasing accuracy needs of high performance automotive radar design work, the FDTD EM simulation method has emerged as a better solution than traditional FEM formulations. FDTD overcomes FEM limitations that force design engineers to trade away accuracy and to simplify their simulation models. This paper introduces FDTD’s advantages for automotive radar circuit and systems level designers.
This whitepaper demonstrates how XFdtd's time-domain approach enables rapid development by allowing engineers to determine the performance of a fully detailed sensor model installed behind a piece of fascia without needing to build prototypes and run tests in an anechoic chamber. The analysis of a 25 GHz sensor frames the discussion.
Advances in computing resources have made it possible to quickly and accurately model the anti-reflective properties of 3-dimensional sub-wavelength structures. In this paper, the FDTD method was used to model anti-reflective properties of a variety of sub-wavelength structures for 300 to 1300 nm input light.
Finite-Difference Time-Domain Modeling of Ultra-High Frequency Antennas On and Inside the Carbon Fiber Body of a Solar-Powered Electric Vehicle
In this paper, FDTD simulations are performed on a 900 MHz band antenna inside and outside the carbon fiber body of a solar-powered electric vehicle. Data are analyzed to determine the optimal antenna placement for transmission to a receiving antenna located toward the rear of the solar vehicle.
This presentation demonstrates how the 3D ray tracing code in Wireless InSite can accurately predict received power coverage even in a multi-room environment containing many walls and different materials types. In order to verify the accuracy of the code, the floor plan of Remcom’s business offices was modeled in the software with a WiFi antenna and a third party tool was used to create a coverage plot of the received power throughout several of the suites.
This presentation describes the simulation of a hearing instrument (HI) device. The design was simulated in the presence of a homogeneous SAM phantom and an anatomically correct, heterogeneous head model. The simulation results illustrate the differences between the head models and highlight the more acceptable results for improved device safety.
Devices designed for free space operation often fail to meet expectations when deployed in their actual environment. This study considers the example of designing a broadband antenna for an unattended ground sensor using Remcom's XFdtd Release 7 (XF7). To address the challenge of attaining acceptable performance over both dry and wet ground conditions, we use Particle Swarm Optimization (PSO). XStream GPU Acceleration and MPI + GPU technology make this type of sophisticated simulation strategy possible, completing multiple optimizations with hundreds of generations to converge on the best values.
An effective approach is presented for simulation of thin resistive sheets in FDTD. The approach is based on surface impedance and piecewise linear recursive convolution technique. This approach can be combined with a conformal scheme so that it can be applied to deal with an arbitrarily shaped thin sheet. The simulation results for a couple of examples have shown that the approach is robust, stable and quite accurate.
Remcom launched a Culvert (Tunnel) Modeling Tool in Wireless InSite 2.7. To validate the accuracy of the ray-tracing method, Remcom embarked on a verification campaign with the new tool. By comparing the results from Wireless InSite against a statistical model developed by researchers in Colorado, Remcom was able to prove the ray-tracing results are accurate. Remcom presented a series of articles confirming these results and demonstrating the use of the tool for modeling RF propagation in mines.
Uncertainty in structure geometry is a fundamental limitation of ray-tracing methods of simulating urban propagation, exacerbated by performing analysis which pass into buildings of unknown configuration. Empirical models provide an alternative, but do not incorporate the full impact of the neighboring urban structures. Presented is a hybrid approach using ray-tracing methods to arrive within the building and applying empirically derived loss factors to incorporate the effect of unknown interior layouts. This approach is compared with a more typical empirical implementation to demonstrate the benefits of hybridization.
Accurately characterizing the propagation of RF signals in tunnels is important for rescue, safety, and military purposes. The material composition of the tunnel, the tunnel shape and size, obstructions, and tunnel bends are challenges facing the computational electromagnetic modeler. In the paper Modeling RF propagation in mines using Wireless InSite, we looked at how the material composition of the tunnel affects the propagation characteristics. In this paper, we extend the analysis of tunnel propagation using Wireless InSite to tunnel diameter and tunnel shape.
This paper presents results from modeling RF propagation in a mine using Wireless InSite®. The Edgar Mine in Idaho Springs, CO provided the realistic scenario for the model. The path loss exponent was evaluated for a 5m section of the modeled mine by considering three different materials (concrete, dry earth, and dry granite) and three different standard deviation of surface roughness values for dry granite (0cm, 0.5cm, and 1cm). When comparing this simulated data with data retrieved from the Edgar Mine, it was determined that Wireless InSite's Uniform Theory of Diffraction (UTD) ray tracing code is capable of portraying a communications system within a mine environment.
This paper presents results from sea to land propagation using Wireless InSite. The effort explores the effects of various elements in the scene and how they impact the results. The various elements in the scene include the ships out at sea, the ships docked, the docks themselves, the buildings around the dock area, and the material properties of each.
Applications ranging from communications to RADAR and even medical devices depend on antenna arrays. Hand calculations successfully facilitate the construction of stand-alone arrays; however, what happens when the mounting platform becomes a part of the radiating system? XFdtd 3D EM Simulation Software ensures that the final design meets all requirements before physical prototyping or manufacturing can begin. This application note from the January 2013 issue of Microwave Journal demonstrates the process of adding an electrically steerable, conformal antenna array to the body of a high speed missile. By leveraging XF7’s XStream GPU Acceleration, a complex 3D simulation including multiple array elements with curved surfaces that could take several hours was completed within a few minutes.
Simulation can greatly enhance the design and prototype process when developing new products. This is especially true for the design of waveguide devices, such as a cavity filter, as the engineer can quickly calculate a number of key metrics leading to an optimal configuration. Through optimization via scripting, exceedingly fast processing using a GPU, and waveguide ports, this presentation demonstrates some of XF7’s features for the design, optimization, and analysis of waveguide devices.
Array modeling is a multistep process that often includes several revisions until the design goal is met. The Mobile Base Station Designer in XF7’s XTend Script Library helps to speed up this design process. XStream® GPU Acceleration rapidly simulates the array using the actual antenna model to ensure the final design meets the design criteria. This presentation demonstrates how to design a conformal antenna array on a curved surface.
Case Study: Using Electromagnetic Simulation to Ensure EMC Compliance: How Remcom’s XFdtd Enabled KEC Limited to Differentiate Itself and Provide a Unique Customer Benefit
KEC, a UK manufacturer of EMC interconnect components and cable harness assemblies, strengthened its market leadership and differentiated itself from the competition by offering a unique technology. Using Remcom’s XFdtd to model and simulate customers’ designs, KEC can identify problems early in the process and recommend corrections before the EMC certification stage. This enables customers to avoid costly mistakes and pass certification testing on the first try.
A Conformal 2D FDFD Eigen Mode Method for Wave Port Excitation and S-Parameter Extraction in 3D FDTD Simulation
In this paper, a conformal 2D FDFD Eigen mode method is derived for solving arbitrarily shaped waveguides or transmission lines. Some examples such as horn antennas, circular waveguide filters and differential pairs are presented to show the capabilities of the developed conformal 2D FDFD Eigen mode solver.
Significant improvements in the quality and reliability of indoor WLAN communications are claimed for devices with MIMO technology applying 802.11n standards, which allow users to achieve a theoretical data rate up to 300-600 Mbps on a single transmission. This paper presents an analysis of a commercial 802.11n MIMO 2×3 dual band (2.4 and 5 GHz) system focusing on the operational throughput performance over an indoor environment for Line of Sight (LOS) and Non Line of Sight (NLOS) scenarios. Combined field strength distribution, throughput, and propagation-channel environments will be examined, comparing physical measurements with simulation results generated in Remcom’s Wireless InSite.