matlab-analyze-em

What it does

Explains that the skill handles S-parameters extraction, MoM vs FEM solver comparison, mesh control, field and current visualization, and behavioral (analytic) S-parameter models for RF PCB components. It outlines the triggers and workflow for obtaining S-parameters, choosing solvers, and inspecting meshes and memory, with steps to visualize fields and currents and to proceed to optimization or circuit integration.

How it works

The skill provides procedural guidance for:

• Extracting S-parameters from RF PCB components using MATLAB syntax (e.g., sparameters(obj, freq, ...)) and plotting results (rfplot).
• Choosing and switching solvers between MoM and FEM, including configuring pcbComponent objects (e.g., pcb.SolverType = 'FEM') and accessing the solver via solver(pcb) to set BoundaryCondition.
• Interpolating sweeps and frequencySweep objects for faster multi-frequency analysis, and extracting rational models when needed.
• Controlling and inspecting mesh density with mesh and meshconfig, including pre-solve memory checks and mesh coarsening guidance.
• Visualizing E/H fields, surface currents, charge distributions, and current distributions with EHfields, current, and charge functions, including near-field grids and observation planes.
• Using behavioral S-parameter models for fast estimates, with syntax for Behavioral=true in sparameters and examples for catalog and pcbComponent objects.

It also enumerates prerequisites for FEM (IDMF, WSL), FEM-related constraints (PEC only, connector spacing), and differences between MoM and FEM results.

When to use it

Use when you need:

• Extraction of S-parameters from RF PCB components
• Comparison of MoM vs FEM solvers or selection of the appropriate solver
• Visualization of fields, currents, and charge distributions
• Mesh density control for accuracy vs speed, and pre-solve memory checks
• Implementation of fast analytic models via Behavioral S-parameters for rapid exploration or optimization

What it can touch

This skill references and instructs use of:

• MATLAB functions and objects such as sparameters, rfplot, EHfields, current, charge, feedCurrent, mesh, meshconfig, memoryEstimate, frequencySweep, and solver via pcbComponent and solver(pcb)
• Solver switching using pcbComponent.SolverType = 'FEM' and solver(pcb) to configure BoundaryCondition
• Behavioral modeling through sparameters with Behavioral=true

Caveats

Notes reference dependencies and constraints for FEM:

• FEM prerequisites include Integro-Differential Modeling Framework for MATLAB and Windows Subsystem for Linux on Windows.
• FEM requires PEC conductivity; finite conductivity metals will error.
• Some FEM properties are available on pcbComponent (e.g., Connector, IsShielded); certain methods like getZEven/getZOdd are not available with FEM.
• Firewall and Windows configuration specifics may affect FEM solves; manual user actions may be required (no autonomous changes).
• WSL memory tuning may be necessary to prevent OOM; guidance is provided but changes must be performed by the user.

These are presented as factual prerequisites and constraints; the skill does not guarantee outcomes beyond what is stated.