Electromagnetic Computer-aided Design Research Articles

A Comparative Study for Designing and Modeling Patch Antenna with Different Electromagnetic CAD Approaches

This paper presents a comparative study for designing and modeling patch antenna with different electromagnetic computer aided design (CAD) approaches as CST, HFSS, FEKO and IE3D. The patch antenna is an insert feed type with a copper patch and Roger RT/duroid substrate as a case study. The Wi-Fi operating frequency of 2.45 GHz is chosen for the resonator design. The effectiveness and limitations for each modeled approach for this case study are discussed in term of the antenna performance analysis.

Numerical and experimental characterization of antenna positioning in a dual-radio mesh router

This paper investigates the influence of the position of the antennas in a dual-radio mesh router by characterizing the router components from an electromagnetic point of view. Since the behavior of a wireless router equipped with multiple devices and antennas can be affected by mutual coupling among several close conducting bodies, numerical and experimental tests are carried out to provide some suggestions for an accurate positioning of the antennas. A reference configuration is implemented in an electromagnetic Computer-Aided Design (CAD) simulator. The most significant numerical results are validated by performing a campaign of measurements in anechoic chamber and deploying a testbed for the derivation of the experimental values of throughput, return loss, power density, and directivity.

Generation of 3D isosurfaces by means of the marching cube algorithm

Within the electromagnetic computer-aided design the postprocessing and visualisation of vector and scalar fields is one of the most important applications. This paper deals with the 3-dimensional generation of isosurfaces for solutions of finite element (FE) and finite difference (FD) systems by means of the marching cube algorithm. It is shown how to obtain triangulated surfaces for scalar fields. Cube or HE-8 hexahedral elements with 6 faces and 8 nodes are used as base cells for the surface subtriangulation. In conjunction with an edge-orientated field allocation, unique surface triangulations are found which maintain the basic properties of fields and surfaces. Examples showing the components or the absolute of vector fields, potentials, temperature distributions, and far field patterns illustrate the quality and functionality of the method.

Introducing real world design problems into the undergraduate electromagnetic curriculum

General-purpose CAD (computer-aided design) programs have been used to teach electromagnetics to undergraduates at Carnegie Mellon University. The focus of the instruction is the use of real-world design problems to teach basic electromagnetics concepts. Students use computers to set up and solve a variety of electrostatics, magnetostatics, eddy current, and microwave problems. This gives them the opportunity to visualize EM fields and to interact with real-world devices and issues. Experience shows that solving such problems by means of electromagnetic CAD tools boosts student motivation and leads to a better grasp of key technical concepts.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A user oriented shell for electromagnetic CAD of axisymmetric devices

A special shell for a general-purpose FEM (finite element method) package (MagNet) for the electromagnetic CAD (computer-aided design) of axisymmetric devices is presented. The basic idea of the shell is that a script file may be quickly and easily created for every basic design. Then, the whole FEM solution procedure is conducted automatically. Any design changes can be made easily and quickly, and a whole sequence of CAD tasks can be prepared and run automatically without any user intervention. An open boundary technique is built into the shell to deal with unbounded problems.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>