Coax Component

Coax is one of the most commonly used feed structures in FDTD simulations. In this visual demonstration, we show you how to draw a coax component in GEMS interface. In addition, we demonstrate how to use the matched load to terminate a coax. This typical terminator has as low as -27dB reflection.  For more detail, please click on the right icon to view the design procedure.

Helix Antenna

Helix antenna is frequently used as an element of the wideband antenna or antenna array. It is difficult to simulate it due to its think wire structure. GEMS is able to use multiple processors to simulate this type of antenna for both single element and array as well. For more detail, please click on the right icon to view the design procedure.

Horn Antenna Array

Antenna array has broad applications in many communication areas. It is difficult to model it using serial version of graphical interface and to simulate using a single processor even a cluster with small number of processors. GEMS provides a robust array generation feature, which allows the user to generate a large array using a single CPU and multiple processors. For more detail, please click on the right icon to view the design procedure.

Car Module from AutoCAD DXF File

In this demonstration case, we show a load procedure of car module. The model is loaded from a DXF file. It may take a while to load a complex model, which depends on number of components. For more detail, please click on the right icon to view the procedure.

Packaging Layer from DXF File

In this demonstration case, we show a load procedure of packaging layer of a real 8-layer chip. The model is loaded from a DXF file and the user will have a chance to determine the height of the package layer if this information is not included in the original DXF file. It may take a while to load a complex model, which depends on the shapes of circuits, ground and power layers. For more detail, please click on the right icon to view the design procedure.

Head model from Triangular Mesh File

The single and multiple layer head models are loaded from a triangular mesh file, which can be converted by an embedded module in GEMS to the solid SAT model. Actually, GEMS can handle almost all the CAD files in this way or another (may need help from other popular software). A sample head module is available upon request. In this visual demo, we guide the user how to load a triangular mesh file into GEMS interface and customize the special head model which the user desires. For more detail, please click on the right icon to view the loading procedure.

Conformal and Non-uniform Mesh Design

For a complicated structure problem, GEMS provides an intersect procedure to design the conformal and non-uniform mesh. The primary purpose for this module is to let the user design a proper mesh for the fine structures embedded in a complex structure, and determine the number of grids according to the user's computer resources.  For more detail, please click on the right icon to view the design procedure.

Parallel Distribution Design

GEMS provides a 3-D parallel processing module, which allows the user to place the processors in a 3-D pattern to achieve a better parallel efficiency. If a subdomain is completely embedded inside a PEC structure or a space where we know the fields are zero all the time, the user does not need to assign any real processors to this subdomain. Also, GEMS can detect the zero field region on the interface between subdomains then ignore this region during the information exchange in the parallel processing. For more detail, please click on the right icon to view the design procedure.

Subgridding and ADI Design

GEMS provides a stable subgridding module to place fine mesh in a region where the fields may vary quickly than other regions. For more detail, please click on the right icon to view the design procedure.

Mode Extraction

The user may need to determine the mode excitation type in a port problem simulation. GEMS offers a mode extraction module, which allows the user to use different modes to excite a port or extract the power distribution in the different modes. For more detail, please click on the right icon to view the design procedure.