Modeling a Powerbus with IE3D

 Geometry and setup Double-sided PCB: Size: 125 mm × 100 mm × 1 mm Top and bottom metal: PEC Dielectric: FR4, εr = 4.5, dielectric loss tangent = 0.015 Simulation Setup: Meshing parameters: meshing frequency = 2 GHz, cells/wavelength = 15 Mesh alignment is enabled: Align polygons and dielectrics Adaptive Intelli-Fit (AIF): disabled Matrix solver: default SVSa Frequency Parameters: 5 MHz - 2 GHz, Step Size = 5 MHz Excitation: Voltage source (1 V, 50 ohms) Simulation result Simulation Time: 5111 secondsNumber of Cells/Volumes/Unknowns: 300/143/1136 Decisions the user must make that affect the accuracy of the result Define the dielectric block as a finite substrate: By default, the substrate size is infinitely large in IE3D. In this case, the dielectric block should be defined as a finite substrate. Please refer to the comments for details. Align meshing between the polygons and the finite dielectric: The meshing alignment between the finite dielectrics and the patch is extremely critical to the simulation results. Define a port as a pair of positive and negative terminals: When there is no infinite ground plane, a user needs to define a port as a pair of positive and negative terminals. Numerical error may be introduced if we don't define a port in pair (+, -) or define a differential port (vertical localized or horizontal localized port with self-contained + and - terminals) on a structure without an infinite ground plane. Comments Why do we need to define a finite substrate? By default, the substrate size is infinitely large in IE3D. In this case, the dielectric block should be defined as a finite substrate. More information ...
 Screen shots Fig. 1. Simulation model Fig. 2. Simulation meshes Fig. 3. Input impedance Fig. 4. Electric field at 3 m, θ=0°, φ=0° Fig. 5. Electric field at 3 m, θ=90°, φ=0° Fig. 6. Electric field at 3 m, θ=90°, φ=90°