MIMO Antenna
 
GEMS is used to simulate the MIMO antenna that includes two PIFA antennas. The antenna is relatively thin compared to its dimensions in the horizontal directions (550:1). GEMS allows you to use a flat domain and achieve the accurate results. The output parameters are MEG, ECC, S-matrix, total active reflection coefficient, and far field patterns. In this showcase, we also compare the simulation result using the large, mediate and small domains in the z-direction.   
 
The basic design procedure in the simulation:
Draw the substrate first and then assign the dielectric material to it
Draw an “F” shaped structure
Draw a ground and assign it to be PEC
Draw a via at one end of the PIFA
Draw a line between another end of the PIFA and the ground, and assign it as a lumped port. Assign its group ID to be “1”
Select the PIFA, probe and lumped port, and click on the Mirror button in the toolbar to generate an image about the symmetric plane.
Change the group ID of the imaged lumped port to “2”
Check the “Output far field pattern for each excitation” in the far field parameter setting window
Specify the domain size and boundary (PML).
Generate the adaptive mesh
Specify the convergence criterion
Simulate the project using a single PC or cluster
The basic settings in the simulation:
Option
Setting
Description
Boundary PML truncates six walls

Open space problem

Excitation

Lumped port

Provide a match load for an open port and excitation
Mesh Non-uniform Adaptive mesh
Output MEG, ECC, S matrix, far field patterns Parameters of MIMO antenna
Simulation A multiple core PC or cluster  
 

Dual PIFA Antenna

 

Far Field Patterns

S-Parameters

 

ECC

Radiation Efficiency

 

MEG

3-D Far Field Pattern