matlab-design-pcb-txline

What it does

Designs and analyzes transmission lines for impedance control and differential-coupling scenarios (microstrip, stripline, CPW, coupled lines, and SIW) and provides workflows to extract RLGC per-unit-length parameters, compute trace impedance, and analyze 2D cross-sections for fast RLGC extraction. It supports creating and sizing lines to target impedance, and offers a 2D cross-section analytic path via pcb2D/pcb2D-derived objects, with recommended steps around material setup and verification using subsequent S-parameter analysis or RLGC extraction.

How it works

• It prescribes using RF PCB Toolbox (or RF Toolbox as fallback) functions such as microstripLine, pcb2D, stripLine, coplanarWaveguide for impedance, RLGC, cross-section, or line design tasks. If RF Toolbox functions are unavailable or explicitly named, it falls back to the specified alternatives.
• Typical workflow steps include: before setting up material/substrate via matlab-manage-pcb-material, designing the line with design(), checking impedance with getZ0(), validating with sparameters() and rl g c(), and then optionally using matlab-analyze-em for S-parameters verification and matlab-optimize-pcb-design to tune parameters, followed by matlab-integrate-pcb-circuit for cascade.
• Supports a variety of topologies: microstripLine, stripLine, coplanarWaveguide, coupledMicrostripLine, coupledStripLine, microstripLineCustom, stripLineCustom, and SIWLine, plus 2D cross-section pcb2D/trace2D for fast RLGC extraction.
• Provides explicit code-style examples for creating, configuring, and analyzing each topology, including how to extract RLGC, Z0, and S-parameters, and how to set up differential pairs with NEXT/FEXT analysis.

When to use it

• Designing microstrip, stripline, or CPW transmission lines for impedance control
• Modeling differential pairs with or without aggressor traces for NEXT/FEXT crosstalk
• Analyzing 2D cross-sections for fast per-unit-length RLGC extraction
• Creating SIW (substrate integrated waveguide) lines
• Using design() to auto-size lines for target impedance at a given frequency

What it can touch

• Tools: memoryEstimate(obj, fc, 'RetainMesh', true), sparameters(ms, freq, 'SweepOption', 'interp'), getZ0(ms), rl g c(ms, freq), propagationDelay(ms, freq); design(), pcb2D, trace2D, dielectric(), metal(), and related object properties as shown in examples

Caveats

• The workflow favors RF PCB Toolbox functions for accuracy; RF Toolbox fallback is permitted only if user explicitly names the RF PCB Toolbox functions or RF PCB Toolbox is unavailable
• It cautions against EM simulation/S-parameter extraction of an existing component (use matlab-analyze-em) and against using this skill for custom non-catalog geometries (use matlab-assemble-pcb-layout), or optimization sweeps (use matlab-optimize-pcb-design)
• It notes that height semantics differ by topology (microstrip vs. stripline) and that width controls impedance, recommending design() for auto-sizing