The Windows application is built on a 3D CAD geometry kernel (imports .stp and .iges files) and has a modern user interface which is custom-designed for user productivity, using Stochastica’s entirely new and different Statistical Wave Physics simulation technology. The most stunning feature is that all three analysis modules solve in only seconds; a full system-level, coupled field solution in typically less than one minute. The Statistical Wave Physics formulation does NOT scale with frequency, so it’s the same solution time for at 250 MHz and 10 GHz (and beyond). This unprecedented speed means fast updating of results plots as model parameters are changed, thus enabling the first truly interactive system-level EMC design process.

Aircraft High Intensity RF (HIRF) Analysis

 1) Coupled cavity Electric fields   Start by importing 3D geometry (.stp, .iges, etc). Use Stochastica’s 3D modeling tool bar to create the volume, surface area and shape of each cavity wavefield (shown green). Choose from a library of cavity field loss mechanisms to define the Q factor in each reverberant wavefield. Small details that effect field levels at high frequencies are not neglected; they are the physical basis for Stochastica’s reverberant field uncertainty models. Use the library of antenna and exterior EM field models and the library of apertures to model backdoor leakage paths and field energy exchange between interior spaces. Solving this model predicts  both statistical mean E field levels and the uncertainty margins. Net power input diagnostics inform shielding effectiveness studies to reduce RS environments	

2)	Cable Harness Currents and Radiation Losses   Next, use  Stochastica’s 3D modeling tool bar to create and locate multi-pin connectors. Then point & click to create wire and multi-layer shield conductors between connector pins; thereby creating multi-conductor cable sections. Use the built-in 2D finite element Cable Properties Solver to get the per-unit-length (PUL) inductance and capacitance, resistance and conductance for each cable segment. Create Junctions to accommodate Bends, Branches and Splices in the cable harness. At the cable ends, click to add terminal blocks which define load impedances and excitations.  The excitation library includes voltage sources, current sources and antenna in an exterior electric field. Solve the cable harness to obtain terminal voltages, currents and crosstalk S parameters (Return loss, Insertion loss, NEXT, FEXT.) and quantify shielding effectiveness.

3) Radiation Coupled Cable-Cavity fields   Couple the two foregoing models with a single selection from the toolbar, to find all instances where cable segments pass through 3D cavity fields. Automatically create Penetration junctions and sub-divide the cable segments. Cable segment radiation resistance controls the cable-cavity field coupling. Stochastica calculates the ideal radiation resistance from each cable segment, but also incorporates lumped radiation impedance models for the residual radiation from cable ends and connectors (the controlling coupling after shielding is deployed). Solve the Coupled model to predict the max, mean & min Electric field levels and the max, mean & min voltage and currents at equipment terminals. NOW you’re ready for fast, interactive design of EMC control measures to meet design targets.

Automobile System-Level EMC Model

2) Cable Harness Currents and Radiation Losses Next, use the 3D modeling tool bar to create and locate multi-pin connectors and termination impedance blocks. Then point & click to create wire and multi-layer shield conductors between connector pins. Use the built-in FEM Cable Properties Solver to get the per-unit-length inductance, capacitance, resistance and conductance for each segment. Apply differential mode (DM) voltage inputs at terminals and plot the mixed mode DM/CM S parameters. Evaluate sensitivity to imbalance in cable properties and imbalance in load impedance to quantify 

1)  Coupled cavity Electric fields    Start by importing 3D geometry (.stp, .iges, etc). Use Stochastica’s 3D modeling tool bar to represent the volume, surface area and shape of each cavity wavefield (shown highlighted green). Choose from a library of cavity field loss mechanisms to define the Q factor in each reverberant wavefield. Small details that can effect field levels at high frequencies are not neglected; they are the physical basis for Stochastica’s reverberant field uncertainty models. Use the library of antenna and exterior EM field models and the library of apertures to model backdoor leakage paths and field energy exchange between interior spaces. Once RS field levels are predicted, net power input diagnostics inform shielding effectiveness studies to reduce RS environments.

3) Radiation Coupled Cable-Cavity fields   Couple the two foregoing models with a single click on the toolbar. This finds all instances where cable segments are coupled to reverberant cavity fields and automatically creates penetration junctions along the cable. Stochastica calculates DM/CM radiation resistance for each segment. RE coupling is strongly influenced by CM versus DM currents, which can be controlled with shielding and ground design in step 2) above. But RS coupling is inherently CM and the model is used to design shielding effectiveness, ferrites, chokes and EMI filters. Solve the Coupled model to predict the max, mean & min EMI levels which can be used as inputs to signal integrity eye diagram and bit error rate models. NOW you’re ready for fast, interactive design of EMC control measures to meet design targets

4) Couple the two foregoing models with a single selection from the toolbar, to find all instances where cable segments pass through 3D cavity fields. Automatically create Penetration junctions and sub-divide the cable segments. Cable radiation resistance controls the cable-cavity field coupling. Stochastica calculates the ideal radiation resistance from each cable segment, but also incorporates lumped radiation impedance models for the residual radiation from cable ends and connectors (the controlling coupling after shielding is deployed). Solve the Coupled model to predict the max, mean & min Electric field levels and the max, mean & min voltage and currents at equipment terminals. NOW you’re ready for FAST, INTERACTIVE design of measures to meet EMC design targets.

Who will use Stochastica ?

Stochastica statistical wave physics modeling software is entirely new. It does not replace numerical simulation but is highly complimentary; it does not eliminate the need for EMC testing … so who will use it ?
EM SIMULATION engineers will use it for 1000x faster predicts at 10+GHz; and when margins must be estimated
EMC TEST engineers will find it simple to learn and quick to get results that aid test planning  and results diagnosis
PROGRAM-level EMC engineers will use it to integrate component supplier EMC data into a system-level EMC model

Stochastica Software

Aircraft High Intensity RF (HIRF) Analysis

Automobile System-Level EMC Model

Who will use Stochastica ?

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