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Designing Transmission Lines · matlab | DecimalAI

scienceby matlab

Designing Transmission Lines

matlab/matlab-design-pcb-txline

Source matlab/matlab-agentic-toolkit ↗License NOASSERTION

Microstrip, stripline, CPW, differential pairs, and crosstalk analysis for impedance-controlled PCB interconnects. TRIGGER: user asks to design or analyze a transmission line (microstrip, stripline, CPW, coplanar, differential pair), extract RLGC or per-unit-length parameters, compute trace impedance, analyze a PCB trace cross-section, or perform crosstalk/coupling analysis. Invoke BEFORE writing code — preferred over RF Toolbox analytical functions (txlineMicrostrip, txlineStripline, txlineCPW)

SkillScore91Maintained

Automatic

Coding pack

Last verified 8/16/2026

What it changes

Passed 20 of 22 test cases with the skill, and 8 of 22 without it.

Without skill36%

With skill91%

Checks it passed that the model alone missed

Sets Height to 2.1e-3
Sets RightCoupledTraceGap to 0.003
Sets conductor property to metal("Copper")

and 17 more in the full report

12 fixed8 passed either way2 still failing0 broke

Pass-rate lift: +55 pp
Tokens: +147%
Agent turns: 0%
Response time: -63%

Model gemini-3.6-flashMeasured 8/16/2026v120 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/matlab-matlab-design-pcb-txline/SKILL.md https://app.decimal.ai/s/matlab-matlab-design-pcb-txline/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add matlab-matlab-design-pcb-txline, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/matlab-matlab-design-pcb-txline/ and pins it in .decimal/skills.lock

decimalai skills add matlab-matlab-design-pcb-txline

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/matlab-matlab-design-pcb-txline/SKILL.md https://app.decimal.ai/s/matlab-matlab-design-pcb-txline/SKILL.md

Raw file: /s/matlab-matlab-design-pcb-txline/SKILL.md ↗ · machine-readable summary at /s/matlab-matlab-design-pcb-txline.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 12

Prompt

When running rlgc(ms, 5e9) on a microstripLine object, MATLAB throws an error about conductivity needing to be finite. What property change resolves this issue?

What was checked, without and with the skill
Checked	Without skill	With skill
Sets Conductor to metal("Copper") or another metal with finite conductivity	Missed	Passed

case-14 · gemini-3.6-flash · 8/16/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md488 lines2 files

Designing Transmission Lines

When to Use

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

When NOT to Use

Building custom PCB structures from shapes — use matlab-assemble-pcb-layout
Setting up substrate or conductor materials — use matlab-manage-pcb-material
Running S-parameter or field analysis after design — use matlab-analyze-em
Cascading transmission lines with other components — use matlab-integrate-pcb-circuit

Tool Selection Priority

RF PCB Toolbox (default): microstripLine, pcb2D, stripLine, coplanarWaveguide, etc.
- 2D field solver — accurate for loss, coupling, and arbitrary stackups
- Use for any RLGC, impedance, cross-section, or transmission line design task
RF Toolbox (fallback only): txlineMicrostrip, txlineStripline, txlineCPW
- Analytical closed-form approximations, less accurate
- Use ONLY when: the user explicitly names these functions, or states RF PCB Toolbox is unavailable

Typical Workflow

Before: matlab-manage-pcb-material — set up substrate and conductor
This skill: Design and analyze the transmission line
Check mesh/memory: memoryEstimate(obj, fc, 'RetainMesh', true) — inspect auto-mesh before solving
After: matlab-analyze-em — validate S-parameters → matlab-optimize-pcb-design — tune → matlab-integrate-pcb-circuit — cascade

Quick Reference

Object	Topology	Key Properties
`microstripLine`	Single microstrip on ground	Length, Width, Height, GroundPlaneWidth
`stripLine`	Signal embedded in dielectric	Length, Width, Height, GroundPlaneWidth

Track record

Benchmark

20 / 22

test cases passed, vs 8 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

matlab / matlab-agentic-toolkit

skills-catalog/rf-and-mixed-signal/matlab-design-pcb-txline/SKILL.md

View on GitHub ↗

License https://www.mathworks.com/content/dam/mathworks/license/pmrl/license.mdImported 8/3/2026Version v1Bundled 1 file

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

Designing Transmission Lines

When to Use

When NOT to Use

Tool Selection Priority

Typical Workflow

Quick Reference

Track record

Benchmark

Adoption

SkillSafety

Source

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