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.

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Rotman Lens Design for Millimeter-Wave Sensor Application

This paper demonstrates the design of Rotman lens for ESM sensor application in operation band 32-38 GHz. The initial design is created in Remcom’s Rotman Lens Designer and then verified against experimental measurements. Parameters of the realized prototype are presented and methods of increasing its performance are outlined.

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Indoor Channel Measurement and Prediction for 802.11n System

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.

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Remcom’s XFdtd and Wireless InSite: Advanced Tools for Advanced Communication Systems Analysis

Ultra-wideband communications technologies such as LTE and WiMax take advantage of advanced equipment configurations such as complex antenna geometries and phased-array emitters. Such systems become tedious or impossible to model analytically, and are therefore highly suited for analysis by electromagnetic simulation. Additionally, once a device alone is modeled, it is necessary to simulate its performance as placed in a practical environment (such as an urban area). This presentation demonstrates how Remcom's XFdtd and Wireless InSite tools, utilizing GPU acceleration technology, are used together to perform advanced communication systems analysis.

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Using Simulation to Optimize Safety, Performance, and Cost Savings When Integrating an Antenna Onto a Platform

Successful integration of an antenna onto a vehicle platform poses many challenges, from vehicle features and motion impacting antenna performance to environmental factors such as terrain and buildings reducing system effectiveness. Furthermore, radiation hazards may pose risks to nearby personnel. This paper provides a variety of examples of how modeling and simulation can be used to analyze antenna performance, identify problems, and evaluate potential solutions.

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Ground Current Modification of Mobile Terminal Antennas and Its Effects

In this paper, a dual-band parasitic radiator is designed and optimized to modify the current distribution on the ground plane of a handheld terminal. Using a variable-length dual-band parasitic radiator, the ground current distribution is controlled, and low specific absorption rate (SAR) and high radiation efficiency at 900 and 1880 MHz are obtained. The proposed antenna scheme consisting of a dual-band parasitic element and a driven dual-band antenna reduces the peak SAR by 50% and 40% at 900 and 1880 MHz, respectively, compared to a conventional dual-band antenna. Significant increase in radiation efficiency is also obtained.

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Automatic Target Recognition with Unknown Orientation and Adaptive Waveforms

This paper demonstrates the closed-loop, adaptive-waveform approach applied to high-fidelity target model signatures generated by XFdtd. The radar equation is incorporated into the authors' models for use in the waveform design procedure. Because SNR varies with range, so do the optimized waveforms for target recognition. Constant-modulus waveform constraints are enforced, and a template-based classification strategy is used.

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MIMO Indoor Propagation Prediction using 3D Shoot-and-Bounce Ray (SBR) Tracing Technique for 2.4 GHz and 5 GHz

The performance of voice, video and data streaming applications using the recently developed standard 802.11n with its MIMO antenna options, strongly depends on the nature of the environment. Although many authors have provided evidence on the effectiveness of this technology in field strength distribution, throughput or propagation-simulation environments, work linking all of these parameters is limited. This paper provides a comparison of metrics for a 2×3 dual-band MIMO system operating at 2.4 and 5 GHz in a typical office building, obtained using a commercial wireless router. The measurements are consistent with simulation results obtained using a 3D Shoot and Bounce Ray (SBR) software.

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WiFi Antenna in Free Space and Subsequent Placement in Netbook

Accurate results are easily obtained after generating a WiFi antenna using the sketching tools in Remcom’s XFdtd Release 7. However, when the antenna design is placed in the realistic operating environment of a netbook computer, it must be tuned for optimal performance.

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Case Study: How Remcom Consulting Helped ReGear Launch a Deep Tissue Heating Device

When ReGear Life Sciences developed a new therapeutic deep heating garment for the shoulder, they needed to validate that the SAR value complied with all applicable FDA and FCC safety regulations before releasing the product to the market. Remcom performed EM simulations, made recommendations on a safer design, and provided the documentation necessary for ReGear to get approval for the product. Using high-end GPU-accelerated computing, Remcom was able to complete the work in a very short amount of time. Outsourcing this part of the project to Remcom saved ReGear time and money, allowing them to focus on marketing the product rather than bringing expensive EM resources in-house.

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Case Study: MRI Coil Improvement for Cardiac Imaging in Mice

It is common knowledge that mice often serve as models for the study of human health conditions and experiments to improve human medical treatments. But most people probably don’t consider the accuracy of the experiments themselves, focusing instead on the results to give us confidence in the progression of our health care. In this case study, Remcom’s XFdtd Release 7 is used to analyze a new spiral MRI coil for more precise cardiac imaging in mice.

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Modeling the Effects of Wind Turbines on Radar Returns

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Adding Arbitrary Antennas for Down Range Propagation with Moving Window FDTD

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An Overview of Remcom's Rotman Lens Designer

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An Overview of Remcom's VariPose

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Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals

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Analysis of Accuracy and Stability of FDTD Subgridding Schemes

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A Novel Spiral Radiofrequency Coil for High Field Mouse Cardiac Imaging

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Design of Wave Ports in FDTD and its Application in Microwave Circuits and Antennas

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XFdtd and Wireless InSite: Remcom's Multiphysics Toolset

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