GEMS PC v.s. GPU
Patch antenna
Two regular PCs directly connected by a network cable and installed with Vista and GEMS v6.0 are much faster than the other commercial FDTD GPU workstation. The cost of two PCs (US$2k) is just a small fraction of the GPU workstation (US$17k).
 
RCS

GEMS is used to predict the RCS (Radar Cross Section) of a dielectric sphere when a plane wave illumines on it. GEMS results match well with the MIE solution.

 
GEMS FSS Solver
From version 7.5, GESM has a new FSS solver that is specially designed for the accurate and fast sovling FSS structures. It is based on the parallel processing and FFT-CGM methods, therefore, it can be handrouds of times faster than the conventional FSS solver.
Dipole Antenna
Patch antenna
A half wavelength dipole, a simplest antenna, is simulated by using GEMS. The far field and impedance are in good agreement with the analytic value.
 
 
 
SAR (Specific Absorption Rate)
The dimensions were taken from the Phantom SAR Test in IEEE 1528 Standards. The output parameters are 1-g SAR, 10-g SAR, local peak SAR, and 3-D SAR distribution.
 
GEMS Performance
GEMS performance on different types of clusters, different processors, and different operating systems has been tested. GEMS created the world record of 90% parallel efficiency using 4000 nodes.
 
EBG (Electric Band Gap) Structure
The EBG structure includes 6-layer infinitely long dielectric cylinders. Periodic boundary condition is used to truncate the EBG element. The output parameters are reflection and transmission coefficients.
 
 
Slot Antenna

A lumped port is used to excite a CPW structure. The output parameters are reflection coefficient and far field pattern.

 

 
Hardware Acceleration Module

Different from GPU, GEMS hardware acceleration uses the vector units in the existing CPU but does not require any extra hardware devices, and in addition, GEMS hardware acceleration module can use all hardware units for the parallel processing.